WO2005007817A2 - Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides - Google Patents
Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides Download PDFInfo
- Publication number
- WO2005007817A2 WO2005007817A2 PCT/US2004/021722 US2004021722W WO2005007817A2 WO 2005007817 A2 WO2005007817 A2 WO 2005007817A2 US 2004021722 W US2004021722 W US 2004021722W WO 2005007817 A2 WO2005007817 A2 WO 2005007817A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composition
- multimeric
- synthase
- poφhobilinogen
- ofthe
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/04—Nitro compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
- A61K31/19—Carboxylic acids, e.g. valproic acid
- A61K31/192—Carboxylic acids, e.g. valproic acid having aromatic groups, e.g. sulindac, 2-aryl-propionic acids, ethacrynic acid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P31/04—Antibacterial agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
Definitions
- PBGS porphobilinogen synthase
- LAD 5 -aminolevulinic acid dehydratase
- PBGS catalyzes the condensation of two 5 -aminolevulinic acid molecules to form the tetrapyrrole precursor porphobilinogen.
- PBGS was previously understood to be a homooctameric metalloenzyme, which utilizes a variety of divalent and monovalent cations at catalytic and allosteric sites.
- Mammalian and yeast enzymes typically require Zn(II), some prokaryotic enzymes require either Mg(II) or Zn(II) or both for maximal activity, and plant enzymes seem to require only Mg(II) for enzymatic activity.
- a small number of organisms have PBGS enzymes that require neither
- PBGS Additional information regarding PBGS is disclosed in references (3-5) and (7).
- personal health care products such as wet wipes, diapers, etc. have the ability to not only provide their intended function, but to cure or prevent a disease or a damage caused by contacting bacteria, archaea, and/or eucarya, for example, while not harming the consumer's health.
- antimicrobial agents have been incorporated into a wide range of consumer products, such as wet wipes, to combat both transient and resident bacteria on skin.
- Antimicrobial-containing products are currently marketed in many forms such as lotions, deodorant soaps, hard surface cleaners, wet wipes, and surgical disinfectants.
- antimicrobial agents are harsh or irritating to the skin due to the nature ofthe chemicals utilized to provide the antimicrobial effect.
- some hard surface cleaners and surgical disinfectants utilize high levels of alcohol and/or surfactants which have been repeatedly shown to dry out and irritate skin tissues.
- Other wet wipes currently available utilize harsh cationic surfactants without the addition of acids.
- the surfactant is capable of penetrating and killing many types of bacteria, it is very irritating and harsh to the skin.
- Many antimicrobial-containing products utilize an organic acid in combination with an anionic or cationic surfactant as antimicrobial agents.
- biofilms can be a problem for certain surfaces. Biofilms may be found on essentially any environmental surface in which sufficient moisture is present. Their development is most rapid in flowing systems where adequate nutrients are available. Biofilms are composed of populations or communities of microorganisms adhering to environmental surfaces and are complex aggregate of cells and polysaccharide. These microorganisms are usually encased in an extracellular polysaccharide that they synthesize.
- the biofilm for example can be formed from mixed culture of Pseudomonas aeruginosa, P.fluorescens and Klebsiellapneumoniae.
- Biofilms may form on solid substrates in contact with moisture, on soft tissue surfaces in living organisms and at liquid air interfaces. Typical locations for biofilm production include rock and other substrate surfaces in marine or freshwater environments. Biofilms are also commonly associated with living organisms, both plant and animal. Tissue surfaces such as teeth and intestinal mucosa which are constantly bathed in a rich aqueous medium rapidly develop a complex aggregation of microorganisms enveloped in an extracellular polysaccharide they themselves produce.
- Biofilms can be a serious threat to health especially in patients in whom artificial substrates have been introduced. Also, biofilms are a threat to bottoms of ship wherein barnacles can grow and corrode the surface or the internal surface of pipes such as oil pumps or dehumidifiers.
- an antimicrobial composition having universal applications. It if further desired to provide an agent capable of disturbing an equilibrium of units of multimeric proteins, e.g., an inhibitor capable of inhibiting tetrapyrrole biosynthesis in plants and/or bacteria.
- the invention provides a composition comprising an agent adapted to affect a multimeric protein by binding to a binding site of said multimeric protein and thereby affecting an equilibrium of units, wherein said multimeric protein comprises an assembly having a plurality of said units, wherein each of said units comprises a first complementary surface and a second complementary surface and wherein the first complementary surface of one unit is associated with the second complementary surface of another unit, provided that the assembly is at least one of different quaternary isoforms on a condition that in said multimeric protein (1) a structure of each of said units determines a structure of said different quaternary isoforms, (2) said units are in the equilibrium and (3) the structure of said different quaternary isoforms influences a
- affecting said multimeric protein comprises affecting a formation of a quaternary isoform. In certain embodiments, affecting said multimeric protein comprises affecting the function of said multimeric protein.
- a non-limiting example a function of said multimeric protein is an activity and wherein affecting is at least one of inhibiting or activating.
- the agent is bound to at least one of a quaternary isoform having a lesser activity or a quaternary isoform having a greater activity.
- each of said units is a member selected from the group consisting of a monomer, a dimer, a trimer, a tetramer, a hexamer, and an octamer.
- said multimeric protein is a member selected from the group consisting of porphobilinogen synthase and a Class la ribonucleotide reductase.
- said multimeric protein is porphobilinogen synthase comprising eight porphobilinogen synthase monomers.
- the active form of the multimeric porphobilinogen synthase has less t than eight monomers.
- the agent is an inhibitor bound to the quaternary isoform having the lesser activity and wherein the quaternary isoform contains less than eight porphobilinogen synthase monomers.
- the inhibitor is rosmarinic acid or a derivative thereof.
- said multimeric protein is the Class la ribonucleotide reductase and the agent inhibits the Class la ribonucleotide reductase through selective binding to the binding site that is unique to the quaternary isoform having the lesser activity.
- a composition comprising an inhibitor adapted to inhibit formation of an active form of a multimeric porphobilinogen synthase having a first number of monomers by binding to a less active form of the multimeric porphobilinogen synthase having a second number of monomers, wherein the first number of monomers is higher than the second number of monomers.
- the multimeric porphobilinogen synthase is derived from bacteria, archaea, or eucarya, provided that the octameric porphobilinogen synthase contains an allosteric magnesium binding site. In one variant of this embodiment, the multimeric porphobilinogen synthase contains a catalytic zinc binding site. In certain embodiments, the multimeric porphobilinogen synthase does not contain the allosteric magnesium binding site and the catalytic zinc binding site. In certain embodiments, said less active form is a hexamer. In certain embodiments, wherein said less active form is a dimer.
- the active form of a multimeric porphobilinogen synthase is an octamer.
- the inhibitor replaces a metal ion and thereby binds at a metal ion binding site.
- the metal ion is zinc and/or magnesium.
- the inhibitor binds at an active site. In certain embodiments, the inhibitor is not a metal cation.
- the inhibitor is adapted to inhibit formation ofthe active form of the multimeric po ⁇ hobilinogen synthase, said active form is an octomeric po ⁇ hobilinogen synthase by binding to a hug-disabling domain of the less active form of the multimeric porphobilinogen synthase containing less than eight monomers.
- the inhibitor is adapted to inhibit formation ofthe active form of the multimeric po ⁇ hobilinogen synthase by binding at a site other than an active site and/or metal ion binding site.
- the inhibitor is adapted to inhibit formation ofthe active form of the multimeric po ⁇ hobilinogen synthase by a mechanism other than removing a metal ion.
- the composition further comprises a delivery medium, said delivery medium is a member selected from the group consisting of a pharmaceutically- acceptable medium, an orally-acceptable carrier, an antibacterial medium, and a herbicidally- effective medium.
- the composition is effective to inhibit or prevent formation ofthe active form of the multimeric po ⁇ hobilinogen synthase and thereby inhibiting or preventing development or growth of bacteria, archaea, and/or eucarya, provided that the active form ofthe multimeric po ⁇ hobilinogen synthase contains an allosteric magnesium binding site.
- the composition is effective to cure or prevent a disease caused by contacting bacteria, archaea, and/or eucarya.
- the composition is at least one of a drug, a toothpaste, a soap, a desinfectant, an anti-biofilm composition, and a herbicide.
- the composition is effective to inhibit or prevent formation of the active form ofthe multimeric po ⁇ hobilinogen synthase and thereby inhibiting or preventing development or growth of bacteria, archaea, and/or eucarya, provided that the active form ofthe multimeric po ⁇ hobilinogen synthase does not contain the allosteric magnesium binding site and the catalytic zinc.
- the composition is effective to cure or prevent a disease caused by contacting bacteria, archaea, and/or eucarya.
- the composition is at least one of a drug, a toothpaste, a soap, and a disinfectant.
- a herbicide resistant plant adapted to be transgenic for a multimeric po ⁇ hobilinogen synthase that substantially exist in a multimeric form of a hugging dimer.
- the multimeric po ⁇ hobilinogen synthase is derived from a human.
- the multimeric po ⁇ hobilinogen synthase contains no allosteric magnesium binding site.
- a composition comprising an inhibitor adapted to bind to a multimeric po ⁇ hobilinogen synthase that does not require zinc for catalytic function.
- a method of affecting a multimeric protein comprising: providing said multimeric protein comprising an assembly having a plurality of units, wherein each of said units comprises a first complementary surface and a second complementary surface and wherein the first complementary surface of one unit is associated with the second complementary surface of another unit, provided that the assembly is at least one of different quaternary isoforms on a condition that (1) a structure of said units determines a structure of said different quaternary isoforms, (2) said units are in an equilibrium and (3) the structure of said different quaternary isoforms influences a function of said multimeric protein; providing the composition ofthe invention comprising the agent, wherein the agent is adapted to affect the equilibrium by binding to a binding site on the assembly; and contacting the assembly with the agent, wherein the agent affects the equilibrium by binding to the binding site and thereby affecting said multimeric protein.
- affecting said multimeric protein comprises affecting a formation of a quaternary isoform. In certain embodiments ofthe method, affecting said multimeric protein comprises affecting a function of said multimeric protein. In certain embodiments of the method, the unit is a member selected from the group consisting of a momomer, a dimer, a trimer, a tetramer, a hexamer, and an octamer. In certain embodiments ofthe method, the agent is adapted to affect a function of said multimeric protein. In certain embodiments of the method, the function of said multimeric protein is an activity and wherein affecting is at least one of inhibiting or activating.
- the agent is bound to at least one of a quaternary isoform having a lesser activity or a quaternary isoform having a greater activity. In certain embodiments of the method, the agent is bound to the quaternary isoform having a greater activity.
- said multimeric protein is a member selected from the group consisting of po ⁇ hobilinogen synthase and a Class la ribonucleotide reductase. In certain embodiments of the method, said multimeric protein is po ⁇ hobilinogen synthase comprising eight po ⁇ hobilinogen synthase monomers.
- said multimeric protein is the Class la ribonucleotide reductase and the agent inhibits the Class la ribonucleotide reductase through selective binding to the binding site that is unique to the quaternary isoform having the lesser activity.
- a method of modulating a physiological activity in a cell, a tissue or an organism comprising: providing the cell, the tissue or the organism, wherein the cell, the tissue or the organism comprise a multimeric protein comprising an assembly having a plurality of units, wherein each of the units comprises a first complementary surface and a second complementary surface and wherein the first complementary surface of one unit is associated with the second complementary surface of another unit, provided that the assembly is at least one of different quaternary isoforms on a condition that (1) a structure of said units determines a structure of said different quaternary isoforms, (2) said units are in an equilibrium and (3) the structure of said different quaternary isoforms influences a function of the multimeric protein; and providing to the cell, the tissue or the organism the composition ofthe invention comprising the agent, wherein the agent is adapted to affect the equilibrium by binding to the binding site on the unit and thereby affecting the formation of a quaternary isoform and thereby modulating the physiological activity.
- a method of inhibiting a multimeric po ⁇ hobilinogen synthase from forming an active form comprising: applying the composition ofthe invention to the multimeric po ⁇ hobilinogen synthase; associating the composition with the less active form; inhibiting the less active form from assembling into the active form and thereby inhibiting the multimeric po ⁇ hobilinogen synthase from forming the active form.
- a method for manipulating growth or development of a plant comprising applying the composition ofthe invention which is a herbicide to the plant, wherein the plant is herbicide resistant and is adapted to be transgenic for a multimeric po ⁇ hobilinogen synthase that substantially exist in a multimeric form of a hugging dimer.
- the multimeric po ⁇ hobilinogen synthase contains no allosteric magnesium binding site.
- a method of making an antibacterial surface comprising: (1) providing the composition ofthe invention wherein the composition is effective to inhibit or prevent formation ofthe active form ofthe multimeric po ⁇ hobilinogen synthase and thereby inhibiting or preventing development or growth of bacteria, archaea, and/or eucarya, provided that the active form of the multimeric po ⁇ hobilinogen synthase contains an allosteric magnesium binding site and the composition is at least one of a drug, a toothpaste, a soap, a desinfectant, an anti-biofilm composition, and a herbicide; (2) providing a surface-forming matrix; and (3) combining the composition with the surface-forming matrix and thereby making the antibacterial surface.
- the antibacterial surface is adapted to prevent or inhibit a formation of a biofilm.
- Fig. IA shows the pH rate profile for wild type human PBGS relative to the F12L variant.
- Fig. IB shows the chromatographic separation of wild type human (Wt) PBGS and F12L on a mono-Q column.
- Fig. 1C shows the differential mobility of wild type (Wt) human PBGS and F12L on
- FIG. 2 A shows schematic representations of a dimer, a tetramer and an octamer of wild type human PBGS.
- Fig. 2B shows schematic representations of a dimer, a tetramer and a hexamer of human PBGS variant F12L.
- Fig. 3A shows the chromatographic separation of two peaks of PBGS protein on Q- Sepharose (KC1 gradient (— ), A280 (-)).
- Fig. 3B shows the differential mobility of two pools of Wt and F12L relative to wild type (Wt) human PBGS and F12L on native gel electrophoresis.
- Fig. 1 shows schematic representations of a dimer, a tetramer and an octamer of wild type human PBGS.
- Fig. 2B shows schematic representations of a dimer, a tetramer and a hexamer of human PBGS variant F12L.
- FIG. 3C shows the pH rate profiles for Pool I (•) and Pool II ( ⁇ ) of Wt and F12L following further purification on Sephacryl S300.
- Fig. 3D shows a plot of activity versus concentration of ALA for determining the K,,, and V max values for the S300 purified Pool I (circles) and Pool II (squares) at pH 7 (black) and pH 9 (gray).
- Fig. 4A shows a schematic representation of the crystal structure of E. coli PBGS, including the location ofthe allosteric magnesium.
- Fig. 4B shows schematic representations of the subunit interfaces of human PBGS octamer (left) relative to the hexamer (right).
- FIG. 5A shows a schematic representation ofthe equilibrium existing between dimeric, hexameric and octameric PBGS.
- Fig. 5B shows native gel electrophoresis of pea PBGS, which is isolated in the presence of magnesium, under assay conditions, in the presence of increasing concentrations of EDTA.
- Fig. 6 shows a classification of PBGS according to the independently segregating criteria of the presence of allosteric magnesium (Mg) (checkered area), the absence of allosteric Mg (white area), the presence of active site zinc (dark grey area), and the absence of active site Zn
- the resulting matrix (far right) consists of four quadrants, wherein the northwest quadrant (Quadrant NW) represents +Zn/-Mg, the northeast quadrant (Quadrant NE) represents -Zn/-Mg, the southwest quadrant (Quadrant SW) represents +Zn/+Mg, and the southeast quadrant (Quadrant SE) represents -Zn/+Mg.
- Fig. 7A represents an alignment of active site metal binding residues for the PBGS sequences of Eukaryota and Archaea, which were obtained from GenBank and other web- searchable genomes available as of April 2002.
- Fig. 7A represents an alignment of active site metal binding residues for the PBGS sequences of Eukaryota and Archaea, which were obtained from GenBank and other web- searchable genomes available as of April 2002.
- Fig. 7B represents an alignment of active site metal binding residues for the PBGS sequences of Eubacteria, which were obtained from GenBank and other web-searchable genomes available as of April 2002.
- Fig. 8 is a classification of sources for PBGS including bacteria, archaea, and eucarya, wherein distribution of metal binding properties of PBGS is coded in accordance with Fig. 6.
- Fig. 9A shows a stereo diagram of one dimer of E. coli PBGS, where the protein subunits are shown as a ribbon diagram. The active site zinc ions are shown as light grey spheres, and the allosteric magnesium ions are shown as black spheres.
- Fig. 9A shows a stereo diagram of one dimer of E.
- coli PBGS where the protein subunits are shown as ribbon diagram and colored black and light grey.
- the active site zinc ions are shown as grey spheres, and the allosteric magnesium ions are shown as black spheres. Active site ligands are not illustrated.
- Fig. 9B shows a stereo diagram of the structural details of the active site zinc.
- the cysteine ligands are labeled and the cysteine sulfur atoms are shown as white balls.
- the water is labeled.
- the active site ligand, 4,7-DOSA is shown in grey, with oxygen atoms as balls.
- Fig. 9C shows a stereo diagram of the structural details of the allosteric magesium binding site.
- the white balls indicate water molecules which form an extended ligation network between the magnesium and oxygen and nitrogen atoms of neighboring residues.
- the amino acids involved in this network are shown as stick diagrams, with carbons colored light or dark accordinging to the chains of Fig. 9A. Oxygen or nitrogen atoms that are involved in the ligation network are shown in a contrasting shade.
- the labeled amino acid E231 is the only amino acid in the first coordination sphere ofthe magnesium.
- Rl 1 derives from the N-terminal arm ofthe neighboring subunit ofthe hugging dimer.
- FIG. 10 shows a schematic representation of an embodiment ofthe inventive inhibition process, wherein an inhibitor of the invention (represented by circles) binds to one or more domains of the dimeric or hexameric PBGS to inhibit the formation of the octamer, stabilize bound forms and shift equilibrium.
- Fig. 1 1 is a two-dimensional schematic representation ofthe equilibrium between two isoforms of a protein demonstrating that an agent that is capable of affecting a function ofthe protein has a binding site on one form of a unit but not on another. In each case, the rules for multimerization are to juxapose one thick line with one dashed line.
- Fig. 1 1 is a two-dimensional schematic representation ofthe equilibrium between two isoforms of a protein demonstrating that an agent that is capable of affecting a function ofthe protein has a binding site on one form of a unit but not on another. In each case, the rules for multimerization are to juxapose one thick line with one dashed line.
- FIG. 12 is a two-dimensional schematic representation ofthe equilibrium between two isoforms of a protein demonstrating that the equilibrium must go through interconversion of different units.
- Fig. 13 is a two-dimensional schematic representation of a variety of quaternary isoforms and the equilibrium between units and oligomers. It shows four different configurations of a protein subunit (a multimeric protein).
- a multimeric protein can be a dimer (shown herein as an oval), a trimer (shown herein as a sphere), and a tetramer (shown herein as a square).
- a shape of a unit controls a shape of a multimeric protein, e.g., there are units that can form a dimer, a trimer, and a tetramer; also, there are units that cannot oligomerize.
- This figure shows that a unit has to undergo specific transformations to form oligomers of certain shapes (isoforms).
- the structure ofthe monomer dictates the oligomeric state and the oligomeric state dictates the functional characteristics.
- two different conformations ofthe unit must be utilized in order to equilibrate between the multimers.
- Fig. 14 is a two-dimensional schematic representation ofthe equilibrium between units and oligomers involving an allosteric regulator (agent).
- the allosteric regulator is shown as a filled gray shape bound to either a unit or to a multimeric protein.
- the allosteric regulator is capable of perturbing the equilibrium between oligomeric states.
- Fig. 15 shows the structure S756393 (in spacefill) as it is fit to the model of hexameric P. aeruginosa PBGS.
- Fig. 16B is a graph featuring specific activity versus concentration of the inhibitor (unfilled circles form a curve wherein no rosmarinic acid was used and filled circles form a curve wherein rosmarinic acid was used at 62.5 mM).
- This invention provides a novel way to think about how different oligomerization states, such as those involved in signaling and cell cycle control, can up-regulate or down-regulate pathways.
- the activity of any protein whose allosteric regulation can be defined by an equilibrium among "mo ⁇ heins” can be modulated by agents (e.g., small molecules) that bind to the unique surface features of one or another of these mo ⁇ heins and thus shift the equilibrium of quaternary forms.
- agents e.g., small molecules
- tetrapyrrole biosynthesis can be modulated by modulating the equilibrium among the mo ⁇ heins of PBGS.
- inhibitor molecules can be discovered that will preferentially interact with the unique surface components ofthe PBGS hexamer and displace the distribution of mo ⁇ heins toward the hexameric form (which in the case of plant and some bacterial PBGS is believed to be the inactive form).
- the invention provides a composition comprising an agent adapted to affect a multimeric protein by binding to a binding site of said multimeric protein and thereby affecting an equilibrium of units, wherein said multimeric protein comprises an assembly having a plurality of said units, wherein each of said units comprises a first complementary surface and a second complementary surface and wherein the first complementary surface of one unit is associated with the second complementary surface of another unit, provided that the assembly is at least one of different quaternary isoforms on a condition that in said multimeric protein (1) a structure of each of said units determines a structure of said different quaternary isoforms, (2) said units are in the equilibrium and (3) the structure of said different quaternary isoforms influences a function ofthe multimeric protein.
- the composition ofthe invention can be used for inhibiting or preventing development or growth of bacteria, archaea, and/or eucarya in a human or an animal host.
- the composition ofthe invention can be used in form of a drug, a toothpaste, a soap, a desinfectant, an anti-biofilm composition, and a herbicide.
- the invention provides a guidance to selection of a target organism and influencing it to achieve a desired effect.
- the unit ofthe multimeric protein can be, for example, a monomer, a dimer, a trimer, a tetramer, a hexamer, and an octamer.
- affecting said multimeric protein comprises affecting a formation of a quaternary isoform. In certain embodiments, affecting said multimeric protein comprises affecting the function of said multimeric protein.
- a non-limiting example a function of said multimeric protein is an activity and wherein affecting is at least one of inhibiting or activating.
- the agent can be bound to at least one of a quaternary isoform having a lesser activity or a quaternary isoform having a greater activity, thus inhibiting or activating the multimeric protein.
- Exemplary multimeric proteins are po ⁇ hobilinogen synthase and a Class la ribonucleotide reductase.
- the agent is an inhibitor bound to the quaternary isoform having the lesser activity and wherein the quaternary isoform contains less than eight po ⁇ hobilinogen synthase monomers.
- the agent inhibits the Class la ribonucleotide reductases through selective binding to the binding site that is unique to a less active quaternary isoform.
- the invention provides a composition
- a composition comprising an inhibitor adapted to inhibit formation of an active form of a multimeric po ⁇ hobilinogen synthase having a first number of monomers by binding to a less active form ofthe multimeric po ⁇ hobilinogen synthase having a second number of monomers, wherein the first number of monomers is higher than the second number of monomers.
- PBGS can exist in at least two alternate quaternary structures, octamer and hexamer.
- the multimeric PBGS having a lesser number of monomers of PBGS is also encompassed by this invention. Previously, only the octameric form was known to exist.
- the monomer contains an ⁇ 8 ⁇ 8 barrel comprised of the C- terminal 300 amino acids, wherein the center of the ⁇ 8 ⁇ 8 barrel contains the active site.
- a variable length N-terminal portion of the subunit forms an extended arm structure that is involved in extensive inter-subunit interactions in both oligomeric forms, i.e., octamer and hexamer.
- a major difference between the two quaternary structures is the conformation ofthe N-terminal arm.
- the multimeric po ⁇ hobilinogen synthase is derived from bacteria, archaea, or eucarya, provided that the octameric po ⁇ hobilinogen synthase contains an allosteric magnesium binding site.
- the multimeric po ⁇ hobilinogen synthase contains a catalytic zinc binding site
- MORPHEINS CONCEPT One dogma of modern biochemistry is that the three dimensional structure of a protein is a direct consequence ofthe amino acid sequence of that protein. Consequently, we are taught that one protein sequence makes one native structure. The discovery of prions challenges the one structure concept, but not if one believes these to be "misfolded". The current invention draws on a new discovery, that of mo ⁇ heins, which are alternate protein quaternary structures that are a physiologically relevant consequence of a conformational change in the monomeric unit.
- Figs. 11 - 14 The first example of mo ⁇ heins is the po ⁇ hobilinogen synthase (PBGS) system where the quaternary structure equilibrium forms the structural basis for the phenomenon of allosterism.
- PBGS po ⁇ hobilinogen synthase
- Figs. 11 - 14 the fundamental structural unit is monomeric and the association of any two units is driven by the placement of a dashed line adjacent to a thick line. This is the rule of assembly.
- Fig. 11 - 14 the fundamental structural unit is monomeric and the association of any two units is driven by the placement of a dashed line adjacent to a thick line. This is the rule of assembly.
- FIG. 13 is a two dimensional illustration ofthe concept that the multiplicity of the assembly is directed by the shape ofthe fundamental structural unit (shown as a monomer) and the rule of assembly.
- the fundamental structural unit shown as a monomer
- Fig. 13 there are four different shapes for the fundamental unit.-
- the monomeric pac-man-like shape in the lower left cannot come together with itself in a way that places the dashed line adjacent to the thick line, this monomer cannot oligomerize.
- the half- oval monomer shape is capable of coming together with itself to form a dimer. Once the dimer is formed, all ofthe dashed lines are adjacent to all ofthe thick lines and oligomerization stops at the dimer.
- each multimer has different physiologically relevant functional characteristics, such as different Km and Vmax values. For instance, one multimer might be the allosteric "on state” with high enzymatic activity and another multimer might be the allosteric "off state” with low activity. Alternatively, the function ofthe different oligomers might be a result of differences in the molecular surface ofthe oligomer.
- Allosterism is a general concept wherein the activity of an enzyme is affected by the binding of an allosteric regulator molecule to a binding site on the protein that is not the catalytic site.
- Most models of allosteric regulation propose that the active and the inactive state are oligomers ofthe same multiplicity, and that these two forms are in equilibrium with each other, and that binding of an allosteric regulator molecule can shift this equilibrium.
- Fig.11 illustrates this concept using for example the tetramer and trimer shown in Fig 13, but adds a splinter to illustrate the allosteric regulator that can only bind to the tetramer. Binding of the splinter perturbs the quaternary structure equilibrium and draws the system toward the tetrameric form.
- Fig. 14 illustrates the concept of agents (shown as wedges) that can trap a desired quaternary state ofthe protein and thus act to draw the equilibrium toward that state.
- these agents which will perturb the quaternary structure equilibrium of mo ⁇ heins, can inhibit or activate the protein.
- the agent is an inhibitor, which traps the inactive form and therefore prevents formation ofthe active form.
- the protein is PBGS, the inactive form is a hexamer and the active form is an octamer.
- the inhibitor is a rosemarinic acid or a derivative thereof.
- the agent is an activator, which traps the active form ofthe protein.
- promoter refers to a nucleic acid sequence, usually found upstream (5') to a coding sequence, that controls expression ofthe coding sequence by controlling production of messenger RNA (mRNA) by providing the recognition site for RNA polymerase or other factors necessary for start of transcription at the correct site.
- mRNA messenger RNA
- a promoter or promoter region includes variations of promoters derived by means of ligation to various regulatory sequences, random or controlled mutagenesis, and addition or duplication of enhancer sequences.
- the promoter region disclosed herein, and biologically functional equivalents thereof, are responsible for driving the transcription of coding sequences under their control when introduced into a host as part of a suitable recombinant vector, as demonstrated by its ability to produce mRNA.
- Regeneration refers to the process of growing a plant from a plant cell (e.g., plant protoplast or explant).
- Transformation refers to a process of introducing an exogenous nucleic acid sequence (e.g., a vector, recombinant nucleic acid molecule) into a cell or protoplast in which that exogenous nucleic acid is inco ⁇ orated into a chromosome or is capable of autonomous replication.
- a “transformed cell” is a cell whose DNA has been altered by the introduction of an exogenous nucleic acid molecule into that cell.
- the term “gene” refers to chromosomal DNA, plasmid DNA, cDNA, synthetic DNA, or other DNA that encodes a peptide, polypeptide, protein, or RNA molecule, and regions flanking the coding sequence involved in the regulation of expression.
- the phrase "DNA segment heterologous to the promoter region” means that the coding DNA segment does not exist in nature in the same gene with the promoter to which it is now attached.
- encoding DNA refers to chromosomal DNA, plasmid DNA, cDNA, or synthetic DNA that encodes any ofthe enzymes discussed herein.
- the term “genome” as it applies to bacteria encompasses both the chromosome and plasmids within a bacterial host cell. Encoding DNAs ofthe present invention introduced into bacterial host cells can therefore be either chromosomally integrated or plasmid-localized.
- the term “genome” as it applies to plant cells encompasses not only chromosomal DNA found within the nucleus, but organelle DNA found within subcellular components ofthe cell. DNAs of the present invention introduced into plant cells can therefore be either chromosomally integrated or organelle-localized.
- herbicide refers to a chemical substance used to kill or suppress the growth of plants, plant cells, plant seeds, or plant tissues.
- inhibitor refers to a chemical substance that inactivates the enzymatic activity of a protein such as a biosynthetic enzyme, receptor, signal transduction protein, structural gene product, or transport protein that is essential to the growth or survival of the organism.
- a protein such as a biosynthetic enzyme, receptor, signal transduction protein, structural gene product, or transport protein that is essential to the growth or survival of the organism.
- an inhibitor is a chemical substance that inactivates the enzymatic activity of po ⁇ hobilinogen synthase.
- herbicide is used herein to define an inhibitor when applied to plants, plant cells, plant seeds, or plant tissues.
- microbe or “microorganism” refer to algae, bacteria, archae, fungi, and protozoa.
- “Overexpression” refers to the expression of a polypeptide or protein encoded by a DNA introduced into a host cell, wherein said polypeptide or protein is either not normally present in the host cell, or wherein said polypeptide or protein is present in said host cell at a higher level than that normally expressed from the endogenous gene encoding said polypeptide or protein.
- plant refers to any plant or part of a plant at any stage of development. Therein are also included cuttings, cell or tissue cultures and seeds.
- plant tissue includes, but is not limited to, whole plants, plant cells, plant organs, plant seeds, protoplasts, callus, cell cultures, and any groups of plant cells organized into structural and/or functional units.
- plastid refers to the class of plant cell organelles that includes amyloplasts, chloroplasts, chromoplasts, elaioplasts, eoplasts, etioplasts, leucoplasts, and proplastids. These organelles are self-replicating and contain what is commonly referred to as the "chloroplast genome,” a circular DNA molecule that ranges in size from about 120 kb to about 217 kb, depending upon the plant species, and which usually contains an inverted repeat region.
- solids refers to the nonaqueous component of a tuber (such as in potato) or a fruit (such as in tomato) comprised mostly of starch and other polysaccharides, simple carbohydrates, nonstructural carbohydrated, amino acids, and other organic molecules.
- tolerance/resistance refers to the ability to continue normal growth or function when exposed to an inhibitor or herbicide.
- transformation refers to a process for introducing heterologous DNA into a cell, tissue, or plant. Transformed cells, tissues, or plants are understood to encompass not only the end product of a transformation process, but also transgenic progeny thereof.
- the "oral composition” is a product, which in the ordinary course of usage, is not intentionally swallowed for pu ⁇ oses of systemic administration of particular therapeutic agents, but is rather retained in the oral cavity for a time sufficient to contact substantially all of the dental surfaces and/or oral tissues for pu ⁇ oses of oral activity.
- the oral composition may be a single phase oral composition or may be a combination of two or more oral compositions.
- orally-acceptable carrier as used herein means a suitable vehicle, which can be used to apply the present compositions to the oral cavity in a safe and effective manner.
- Such vehicle may include materials such as fluoride ion sources, additional anticalculus agents, buffers, other abrasive materials, peroxide sources, alkali metal bicarbonate salts, thickening materials, humectants, water, surfactants, titanium dioxide, flavor system, sweetening agents, xylitol, coloring agents, and mixtures thereof.
- fluoride ion sources additional anticalculus agents
- buffers other abrasive materials
- peroxide sources alkali metal bicarbonate salts
- thickening materials e.g., water, surfactants, titanium dioxide, flavor system, sweetening agents, xylitol, coloring agents, and mixtures thereof.
- mo ⁇ heins are like prions; one protein sequence that can undergo a conformational change which results in an altered quaternary structure (aggregation state).
- mo ⁇ heins are unlike prions in that the oligomer is of finite mulitplicity and the quaternary structure change is reversible, non-pathologic, and part of a normal physiologic control process. Accordingly, in this the invention, a general mechanism for allosteric regulation using mo ⁇ heins (quaternary structure isoforms) is proposed. In this mechanism, the monomeric structures are different in some aspect of their secondary/tertiary structure, and these differences dictate an assembly into one or the other mo ⁇ hein. This mechanism is illustrated schematically in Figs. 1 1-14.
- Fig. 11 is a two dimensional representation ofthe equilibrium between two forms of a protein (mo ⁇ heins).
- a unit (e.g., a monomer) of one form contains four different surfaces, which are a line, a thick line, a dashed line, and a squiggly line.
- the complementary surfaces that naturally associate are illustrated herein as the thick line with the dashed line. This association defines the rule of engagement between the units.
- the subunit association potential ofthe square is satisfied (in another words when all thick lines are associated with all dashed lines)
- the optimal resulting assembly is a tetramer.
- the oligomeric assembly is dictated by the structure ofthe monomer and the rule of engagement. As shown in Fig.
- the square structure can associate with a "splinter", which is a schematic representation of an agent (e.g., an allosteric regulator molecule); association of the square monomer and the square tetramer with the splinter affect a function ofthe multimeric protein, for example, in the case of plant and some bacterial PBGS, magnesium provides stability to these forms ofthe protein.
- the square unit is in equilibrium with another structure, which shares some, but not all of its secondary and tertiary structure and consequently shares only some of the surface characteristics.
- the alternate unit is illustrated in Fig. 11 as a segment. This monomer contains the surfaces depicted by the thick line and the dashed line; the rule of engagement between these surfaces is the same as for the square unit.
- the alternate unit assembles into a trimer. It is important that the trimeric structure and its individual components do not contain the binding site for the allosteric regulator molecule (the splinter). Since the splinter stabilizes the square and its oligomer, the presence ofthe splinter wilfpull the equilibrium ofjquaternary structures toward the square and its oligomers.
- the observation of hexameric PBGS provided the first example of how quaternary structure can serve as a structural basis for allosteric regulation of protein function.
- Fig. 11 is a general description of the behavior of PBGS.
- the square is the hugging dimer and the segment is the detached dimer.
- the structures share some, but not all surface characteristics and the rule of engagement between surfaces is to a first approximation shared between the two alternate structures.
- the differences in oligomeric structure translate to different functional characteristics. It is reasonable to assume that different quaternary structures of other proteins also translate to different functional characteristics.
- dimerization of receptors is associated with signal transduction. What has not been appreciated prior to this invention is that the structures ofthe monomer within the dimer structure may not be the same as the structures of the monomer when they are not in the dimer structure.
- Another non-limiting example of a protein which contains mo ⁇ heins is a Class la ribonucleotide reductase.
- the recent model put forth for allosteric regulation of Class la ribonucleotide reductase describes an equilibrium between a tetramer and a hexamer (Cooperman and Kashlan, 2003, Adv. In Enzyme Regulation, 43:167-187).
- the model is schematic only and authors do not have protein structures that define the differences in the putative mo ⁇ heins.
- ribonucleotide reductase is essential for de novo DNA biosynthesis
- the Class la enzymes are found in all eucaryotes, and inhibition of de novo DNA biosyntheis is a rational approach to cancer chemotherapy.
- affecting a function of Class la ribonucleotide reductases e.g., the inhibition
- the multimetic protein ofthe invention should have at least one characteristic such as a protein concentration dependent specific activity or an ability to separate into different assemblies by e.g., ion-exchange chromatography, native gel eletrophoresis; analitical ultracentrifugation, size -exclusion chromatography (on the basis of size);
- a protein concentration dependent specific activity or an ability to separate into different assemblies by e.g., ion-exchange chromatography, native gel eletrophoresis; analitical ultracentrifugation, size -exclusion chromatography (on the basis of size);
- kinetic studies can be conducted to show e.g, K Cincinnati, and V max ; activity as a function of substrate concentration fit to MM equation; mo ⁇ heins will not fit well to a hyperbolic curve but rather a double hyperbolic curve, (see Nature Strucure Biology)
- a function ofthe multimeric protein is an enzymatic activity and an ability to interact with other molecules such as, for example, an ability
- the agent is adapted to affect a function of the multimeric protein.
- Non-limiting examples of the function of the multimeric protein is an activity and wherein affecting is at least one of inhibiting or activating.
- the agent is associated with the quaternary isoform having a lesser activity.
- the agent is bound to the quaternary isoform having a greater activity.
- the octameric form of PBGS binds to substrate in a physiologically relevant concentration range and is active at physiological pH.
- the octamer is composed of four hugging dimers, where the arms of one subunit hug the barrel of an adjacent subunit with which there are strong barrel-to-barrel interactions.
- the newly discovered hexameric form of PBGS is an essential component of the regulation of tetrapyrrole biosynthesis in a subset of organisms, including plants and some pathogenic bacteria, but not including humans, animals or fungi.
- the hexameric form is substantially inactive under physiological conditions.
- the hexamer cannot bind substrate in the physiologically relevant concentration range because its K,,, value is at least two orders of magnitude larger than the K,,, of the octamer.
- the hexamer is composed of three detached dimers, where the N-terminal arms do not interact with the adjacent subunit with which there are strong barrel-to-barrel contacts.
- the transition between the hexameric form and the octameric form involves a significant change in the protein structure. See, e.g., Fig. 5 A.
- Certain embodiments ofthe invention relate to the inhibition ofthe structural change from a hexamer to an octamer, to inhibit the activation of PBGS and tetrapyrrole biosynthesis in plants and/or bacteria. Since the inhibition mechanism is effective for plants and bacteria, but not animals, the invention provides a novel approach to bacteriostatic, antibiotic and herbicide applications.
- the invention comprises an inhibitor ofthe hexamer-to- octamer transition for those PBGS that are physiologically regulated by magnesium.
- the inhibitor can be a known or novel compound.
- the inhibitor is effective at inhibiting tetrapyrrole biosynthesis in plants and bacterial pathogens at that point in their growth and development where the hexamer-to-octamer transition is physiologically significant. Inhibition of the quaternary structure transition from hexameric PBGS to octameric PBGS is a novel target for the development of antibiotics and herbicides. There is a phylogenetic variation in PBGS proteins where some have an allosteric magnesium and others do not. The PBGS that have the allosteric magnesium are comprised of the archaea, all the bacteria with the exception of the genus Rhodobacter, and all of the photosynthetic eucarya (e.g., green plants) (24).
- Each E.coli PBGS monomer contains two metal ions, neither of which is phylogenetically conserved.
- the active site contains a zinc ion that is essential to E.coli PBGS activity but whose three cysteine ligands are not present in many PBGS. This zinc functions in the binding and reactivity ofthe second substrate molecule (33). Details of the zinc site are illustrated in Fig.9B.
- the first matrix (far left) is divided into two classes: (a) active site zinc on the left (shaded), and (b) no active site zinc on the right (unshaded).
- the second matrix is divided into two classes: (a) no allosteric magnesium on top (diamonds), and (b) allosteric magnesium on the bottom (squares).
- Combining the two matrixes provides a matrix (far right) consisting of four quadrants, wherein the northwest quadrant (QNW) represents +Zn/-Mg, the northeast quadrant (QNE) represents -Zn/-Mg, the southwest quadrant (QSW) represents +Zn/+Mg, and the southeast quadrant (QSE) represents -Zn/+Mg.
- approximately one-half of the currently available sequences encode an active site zinc requirement and one-half do not (i.e., QNW + QSW ⁇ QNE + QSE).
- PBGS sequences In contrast to the active site metal pattern distribution, more than 90% ofthe PBGS sequences contain the determinants for allosteric magnesium binding (i.e., QSW + QSE » QNW + QNE).
- the inhibitor will be most effective against a subset of PBGS that contain the allosteric magnesium but do not contain the active site zinc (i.e., PBGS within QSE).
- PBGS within QSE the photosynthetic eucaryotes and a subset of bacteria, including pathogens such as Pseudomonas aeruginosa.
- These PBGS proteins elicit the property of protein concentration dependent specific activity, which indicates an interconversion between large active quaternary forms and smaller less active quaternary forms.
- the inhibitor of the invention is effective to inhibit the formation of octameric PGBS derived from bacteria, archaea, or eucarya, provided that the octameric PGBS contains an allosteric magnesium binding site.
- Fig. 8 A non-limiting list of sources ofthe octameric PGBS, which can be inhibited by the composition ofthe invention, is shown in Fig. 8, which is a classification of organisms including bacteria, archaea and eucarya. Figs.
- FIG. 7A and 7B represent an alignment of active site metal binding residues for the PBGS sequences obtained from GenBank and other web-searchable genomes available as of April 2002.
- the assignment of an organism into one ofthe four quadrants of Fig. 6 is based on the sequence information presented in Fig.7.
- the presence of the active site zinc binding site is indicated by a cysteine rich cluster (positions 122, 124, and 132 of human PBGS) in association with an arginine residue on the active site lid (position 221 of human PBGS).
- the inhibitor replaces a metal ion and thereby binds at a metal ion binding site, preferably, the metal ion is zinc or magnesium.
- the inhibitor binds at an active site.
- the inhibitor can bind any here, but the binding site must stabilize one quaternary structure. Binding is preferable to a site that is present in one multimer but not the other.
- Inhibitors ofthe invention can be identified using the following protocol.
- a model is provided for a hexameric form of a PBGS that contains the allosteric magnesium but does not contain the active site zinc.
- the initial model can, e.g., be one of pea PBGS.
- small molecule databases are screened in silico for molecules that will fit into a hug-disabling domain adjacent to the N-terminal portion ofthe subunit.
- the hug-disabling domain is at least one area of the detached dimer on which binding of the inhibitor inhibits the arms of the dimer from hugging the barrel of that dimer which is necessary to form another dimer to form the active octamer. See Fig. 10, wherein circles represent inhibitors.
- a likely site of a hug-disabling domain is underneath the joint at which a hugging arm joins the body ofthe subunit (i.e., at the "arm-pit").
- Theoretically suitable molecules will be empirically tested in vitro by determining their effect on the protein concentration dependent specific activity of pea PBGS, which is available using an artificial gene construct. Those molecules that inhibit the specific activity of the protein in a protein concentration fashion are good inhibitor candidates.
- the following method will allow identifying inhibitors that will bind anywhere, not necessarily in the hug-disabling domain on PBGS to inhibit octamer formation.
- a functional assay for specific activity of PBGS will be used first to select potential inhibitors from available molecules that are identified in the computational screen, e.g., substances that are not harmful to humans. After potential inhibitors are selected, they will be further screened for affecting specific activity based on protein concentration.
- this invention provides a method of affecting a multimeric protein, the method comprising: providing said multimeric protein comprising an assembly having a plurality of units, wherein each of said units comprises a first complementary surface and a second complementary surface and wherein the first complementary surface of one unit is associated with the second complementary surface of another unit, provided that the assembly is at least one of different quaternary isoforms on a condition that (1) a structure of said units determines a structure of said different quaternary isoforms, (2) said units are in an equilibrium and (3) the structure of said different quaternary isoforms influences a function of said multimeric protein; providing the composition ofthe invention comprising the agent, wherein the agent is adapted to affect the equilibrium by binding to a binding site on the assembly; and contacting the assembly with the agent, wherein the agent affects the equilibrium by binding to the binding site and thereby affecting said multimeric protein.
- affecting said multimeric protein comprises affecting a formation of a quaternary isoform. In certain embodiments of the method, affecting said multimeric protein comprises affecting a function of said multimeric protein.
- a method of inhibiting a multimeric po ⁇ hobilinogen synthase from forming an active form comprising: applying the composition ofthe invention to the multimeric po ⁇ hobilinogen synthase; associating the composition with the less active form; inhibiting the less active form from assembling into the active form and thereby inhibiting the multimeric po ⁇ hobilinogen synthase from forming the active form.
- a non-limiting example of the inhibitor is a rosemarinic acid or derivatives thereof.
- a preferred application of the inventive composition is for inhibiting or preventing development or growth of bacteria, archaea, and/or eucarya in a human or an animal host.
- Other applications of the composition of the invention include prevention or inhibition of biofilms on various surfaces including teeth, pipes, tubing ships, or generally any surfaces immersed in water/air mixtures wherein bacteria causing damage can be found.
- the compositions of the invention can be effective to prevent or inhibit growth of barnacles on a surface of a ship.
- a composition of the invention can be used to prevent or inhibit damage caused by certain species. Examples of organisms in QSE in the Table so these organisms are primary targets for applying the composition of the invention.
- composition of the invention can be envisioned such as, for example, a drug, a toothpaste, a soap, a desinfectant, an anti-biofilm composition and a herbicide.
- Table 1 Bacteria with PBGS in the SE quadrant
- the composition ofthe present invention is effective to cure or prevent a disease caused by bacteria, archaea, and/or eucarya.
- the composition is effective to prevent formation ofthe multimeric PBGS (e.g., octameric PBGS or another active form having a lesser number of nomomers) and thereby inhibit or prevent development or growth of bacteria, archaea, and/or eucarya.
- the multimeric PBGS contains an allosteric magnesium binding site.
- the composition is effective to cure or prevent a disease caused by contacting bacteria, archaea, and/or eucarya.
- the composition is at least one of a drug, a toothpaste, a soap, a desinfectant, an anti-biofilm composition, and a herbicide.
- the composition does not contain the allosteric magnesium binding site and the catalytic zinc.
- the composition is effective to cure or prevent a disease caused by contacting bacteria, archaea, and/or eucarya.
- the composition is at least one of a drug, a toothpaste, a soap, and a disinfectant.
- Antibiotics, herbicides, and fungicides are often based on the inhibition of an essential pathway that is specific to the bacteria, plant, or fungus and that is not present in humans/animals.
- the penicillin class of antibiotics is directed against bacterial cell wall biosythesis, and animal cells do not have cell walls
- the herbicide glyphosate is directed against aromatic amino acid biosynthesis, and humans do not have this pathway, we must eat aromatic amino acids.
- the phylogenetic variation in metal binding sites among the PBGS of various organisms provides sufficient structural differences for development of an inhibitory agent that will not be inhibitory toward human PBGS.
- PBGS In the case of PBGS, there are significant differences between organisms in the inherent ability of the PBGS to equilibrate between mo ⁇ hein forms and in the amino acid sequence of the mo ⁇ hein surfaces.
- the target In the case ofthe more general inhibition of protein function through the selective stabilization of one mo ⁇ hein form, it may be the case that the target is a pathway that is not present in humans or it may be the case that the target simply has sufficient phylogentic variation outside the active site that the surfaces ofthe mo ⁇ heins are very different.
- the composition comprises a pharmaceutically-acceptable medium in addition to the agent.
- pharmaceutically-acceptable medium denotes a medium, such as a solvent, that is able to deliver the inhibitor, as well as any other active agents in the composition, to the target organism in a relatively safe and effective manner.
- the medium itself need not have any pharmaceutical activity.
- pharmaceutically-acceptable medium includes any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and abso ⁇ tion delaying agents and the like. The use of such media and agents for pharmaceutically active substances is well known in the art.
- compositions of the present invention may include classic pharmaceutical preparations. Administration of these compositions according to the present invention will be via any common route so long as the target tissue is available via that route.
- compositions would normally be administered as pharmaceutically acceptable compositions, described supra.
- the composition ofthe present invention is advantageously administered in the form of i ⁇ jectable compositions either as liquid solutions or suspensions; solid forms suitable for solution in, or suspension in, liquid prior to injection also may be prepared. These preparations also may be emulsified.
- a typical composition for such pu ⁇ oses comprises a 50 mg or up to about 100 mg of human serum albumin per milliliter of phosphate buffered saline.
- aqueous solutions include aqueous solutions, non-toxic excipients, including salts, preservatives, buffers and the like.
- non-aqueous solvents are propylene glycol, polyethylene glycol, vegetable oil and injectable organic esters, such as ethyloleate.
- Aqueous carriers include water, alcoholic/aqueous solutions, saline solutions, parenteral vehicles such as sodium chloride, Ringer's dextrose, etc.
- Intravenous vehicles include fluid and nutrient replenishers.
- Preservatives include antimicrobial agents, anti-oxidants, chelating agents and inert gases. The pH and exact concentration of the various components in the pharmaceutical are adjusted according to well know parameters. Additional formulations are suitable for oral administration.
- Oral formulations include such typical excipients as, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, cellulose, magnesium carbonate and the like.
- the compositions take the form of solutions, suspensions, tablets, pills, capsules, sustained release formulations or powders.
- the route is topical, the form may be a cream, ointment, salve or spray.
- An effective amount ofthe therapeutic agent is determined based on the intended goal.
- unit dose refers to a physically discrete unit suitable for use in a subject, each unit containing a predetermined quantity ofthe therapeutic composition calculated to produce the desired response in association with its administration, i.e., the appropriate route and treatment regimen.
- the quantity to be administered depends on the subject to be treated, the state ofthe subject and the protection desired. Precise amounts ofthe therapeutic composition also depend on the judgment ofthe practitioner and are peculiar to each individual.
- Another application of the inventive composition is a herbicide, wherein the composition additionally comprises a herbicidally-effective medium.
- “herbicidally-effective medium” denotes a medium, such as a solvent, that is able to deliver the inhibitor, as well as any other active agents in the composition, to the target organism.
- the medium itself need not have any herbicidal activity.
- Guidance for applying antibacterial compositions on crops is provided as follows: since all photosynthetic eukaryots fall in the QSE quadrant of Fig 6, they are themselves targets for the inhibitors proposed in this invention. However, the arm-pit inhibitor binding site shown in Fig 10 has significant phylogenetic variation between plants and bacteria. Hence, agents that would act as an antibacterial spray on crops would need to be those that will bind to this site in the bacterial PBGS, but not in the plant PBGS.
- compositions ofthe present invention include both dilute compositions, which are ready for immediate use, and concentrated compositions, which require to be diluted before use, usually with water.
- the solid compositions may be in the form of granules, or dusting powders wherein the active ingredient is mixed with a finely divided solid diluent, e.g. kaolin, bentonite, kieselguhr, dolomite, calcium carbonate, talc, powdered magnesia, Fuller's earth or gypsum or a combination thereof. They may also be in the form of dispersible powders or grains, comprising a wetting agent to facilitate the dispersion ofthe powder or grains in liquid. Solid compositions in the form of a powder may be applied as dusts.
- Liquid compositions may comprise a solution, suspension, or dispersion ofthe active ingredients in water optionally containing a surface-active agent, or may comprise a solution or dispersion ofthe active ingredient in a water-immiscible organic solvent, which is dispersed as droplets in water.
- the herbicidal composition is suitable either for tank mixing to produce a dilute composition ready for immediate use or for the formation of a concentrate.
- the solutions or dispersions may be prepared by dissolving the active ingredients in water or an organic solvent optionally containing wetting or dispersing agent(s) and then, when organic solvents are used, adding the mixture so obtained to water optionally containing wetting or dispersing agent(s).
- Suitable organic solvents include, for example, ethylene dichloride, isopropyl alcohol, propylene glycol, diacetone alcohol, toluene, kerosene, methylnaphthalene, xylene or trichloroethylene, or a combination thereof.
- Other additives and adjuvants may also be present in compositions of the present invention. Examples include anti-freeze agents such as ethylene glycol and propylene glycol; dyes; dispersants; rheological agents; anti-foam agents such as silicone based agents; and humectants such as ethylene glycol.
- HERBICIDE RESISTANT PLANT Further provided is a herbicide resistant plant adapted to be transgenic for a multimeric po ⁇ hobilinogen synthase that substantially exist in a multimeric form of a hugging dimer.
- the multimeric po ⁇ hobilinogen synthase is derived from a human.
- the multimeric po ⁇ hobilinogen synthase contains no allosteric magnesium binding site. The following provides a guidance to making the herbicide resistant plant adapted to be transgenic for a multimeric po ⁇ hobilinogen synthase.
- the expression in a plant of a gene that exists in double-stranded DNA form involves transcription of messenger RNA (mRNA) from one strand of the DNA by RNA polymerase enzyme, and the subsequent processing of the mRNA primary transcript inside the nucleus. This processing involves a 3' non-translated region, which adds polyadenylate nucleotides to the 3' end ofthe RNA. Transcription of DNA into mRNA is regulated by a region of DNA usually referred to as the promoter.
- the promoter region contains a sequence of bases that signals RNA polymerase to associate with the DNA and to initiate the transcription of mRNA using one of the DNA strands as a template to make a corresponding complimentary strand of mRNA.
- promoter chosen will have the desired tissue and developmental specificity. Therefore, promoter function should be optimized by selecting a promoter with the desired tissue expression capabilities and approximate promoter strength and selecting a transformant that produces the desired PBGS activity. This selection approach from the pool of transformants is routinely employed in expression of heterologous structural genes in plants because there is variation between transformants containing the same heterologous gene due to the site of gene insertion within the plant genome (commonly referred to as "positional effect").
- the PBGS transgene is to be expressed in the chloroplast in response to light. More specifically, the PBGS transgene is transcribed into mRNA in the nucleus and the mRNA is translated into a precursor polypeptide (Chloroplast Transport Peptide (CTPVPBGS) in the cytoplasm. The precursor polypetide is then transported (imported) into the chloroplast.
- CTPVPBGS Chroplast Transport Peptide
- chloroplast light inducible promoters that are active in plant cells have been described in the literature.
- examples of such promoters include the light-inducible promoter from the small subunit of ribulose-1,5- bisphosphate carboxylase (ssRUBISCO), a very abundant plant polypeptide, the chlorophyll a b binding protein gene promoters and the phytochrome promoter which has been utilized recently in a light-switchable promoter system (Shimizu-Sato et al., 2002).
- Some of these promoters have been used to create various types of DNA constructs that have been expressed in plants; see, e.g., PCT publication WO 84/02913.
- promoters that are known to or are found to cause transcription of DNA in plant cells in response to light can be used in the present invention.
- Such promoters may be obtained from a variety of sources such as plants and plant viruses and include, but are not limited to, the enhanced CaMV35S promoter and promoters isolated from plant genes such as small subunit of ribulose- 1 ,5-biphosphate carboxylase (ssRUBISCO) genes.
- ssRUBISCO small subunit of ribulose- 1 ,5-biphosphate carboxylase
- said promoter is leaky in order to provide tetrapyrroles necessary for the non-photosynthetic functions ofthe plant.
- Plastid-directed Expression of PBGS Activity the PBGS gene is fused to a CTP, in order to target the PBGS protein to the plastid.
- chloroplast and plastid are intended to include the various forms of plastids including amyloplasts. Many plastid-localized proteins are expressed from nuclear genes as precursors and are targeted to the plastid by a CTP, which is removed during the import steps.
- chloroplast proteins examples include the small subunit of ribulose-l,5-biphosphate carboxylase (ssRUBISCO, SSU), 5-enolpyruvateshikimate- 3-phosphate synthase (EPSPS), ferredoxin, ferredoxin oxidoreductase, the light-harvesting- complex protein I and protein II, and thioredoxin F.
- ssRUBISCO small subunit of ribulose-l,5-biphosphate carboxylase
- EPSPS 5-enolpyruvateshikimate- 3-phosphate synthase
- ferredoxin ferredoxin
- ferredoxin oxidoreductase ferredoxin oxidoreductase
- the light-harvesting- complex protein I and protein II examples include thioredoxin F.
- the glyphosate-tolerant EPSP synthase plant gene also encodes a polypeptide which contains a CTP, which enables the EPSP synth
- non-plastid proteins may be targeted to the chloroplast by use of protein fusions with a CTP and that a CTP sequence is sufficient to target a protein to the plastid.
- a CTP sequence is sufficient to target a protein to the plastid.
- Those skilled in the art will also recognize that various other chimeric constructs can be made that utilize the functionality of a particular plastid transit peptide to import the PBGS enzyme into the plant cell plastid.
- the PBGS gene could also be targeted to the plastid by transformation of the gene into the chloroplast genome (Daniell et al., 1998).
- chloroplast uptake signals such as the CTP are rich in Ser, Thr and small hydrophobic amino acid residues.
- the RNA produced by a DNA construct ofthe present invention may also contain a 5' non-translated leader sequence.
- This sequence can be derived from the promoter selected to express the gene and can be specifically modified so as to increase translation of the mRNA.
- the 5' non-translated regions can also be obtained from viral RNAs, from suitable eukaryotic genes, or from a synthetic gene sequence.
- the present invention is not limited to constructs wherein the non-translated region is derived from the 5' non-translated sequence that accompanies the promoter sequence. Rather, the non-translated leader sequence can be derived from an unrelated promoter or coding sequence. In monocots, an intron is preferably included in the gene construct to facilitate or enhance expression ofthe coding sequence.
- suitable introns include the HSP70 intron and the rice actin intron, both of which are known in the art.
- Another suitable intron is the castor bean catalase intron (Suzuki et al., 1994).
- Polyadenylation Signal The 3' non-translated region ofthe chimeric plant gene contains a polyadenylation signal that functions in plants to cause the addition of polyadenylate nucleotides to the 3' end ofthe
- RNA examples include (1) the 3' transcribed, non-translated regions containing the polyadenylation signal of Agrobacterium tumor-inducing (Ti) plasmid genes, such as the nopaline synthase (NOS) gene, and (2) plant genes like the soybean storage protein genes and the small subunit ofthe ribulose-l,5-bisphosphate carboxylase (ssRUBISCO) gene.
- Ti Agrobacterium tumor-inducing
- NOS nopaline synthase
- ssRUBISCO plant genes like the soybean storage protein genes and the small subunit ofthe ribulose-l,5-bisphosphate carboxylase
- the cloning vector with the desired insert may be isolated and subjected to further manipulation, such as restriction digestion, insertion of new fragments or nucleotides, ligation, deletion, mutation, resection, etc. so as to tailor the components ofthe desired sequence.
- the construct Once the construct has been completed, it may then be transferred to an appropriate vector for further manipulation in accordance with the manner of transformation ofthe host cell.
- a recombinant DNA molecule ofthe invention typically includes a selectable marker so that transformed cells can be easily identified and selected from non-transformed cells.
- nptll neomycin phosphotransferase
- selectable markers include the bar gene, which confers bialaphos resistance; a mutant EPSP synthase gene (Hinchee et al., 1988), which confers glyphosate resistance; a nitrilase gene, which confers resistance to bromoxynil (Stalker et al., 1988); a mutant acetolactate synthase gene (ALS), which confers imidazolinone or sulphonylurea resistance (European Patent Application 154,204, 1985); and a methotrexate resistant DHFR gene (Thillet et al., 1988). Plants that can be made to express the PBGS transgene include, but are not limited to,
- Suitable plant transformation vectors include those derived from a Ti plasmid of Agrobacterium tumefaciens, as well as those disclosed, e.g., by Herrera-Estrella et al. (1983), Bevan (1984), Klee et al. (1985) and EPO publication 120,516.
- Ri root-inducing
- alternative methods can be used to insert the DNA constructs of this invention into plant cells. Such methods may involve, for example, the use of liposomes, electroporation, chemicals that increase free DNA uptake, free DNA delivery via microprojectile bombardment, and transformation using viruses or pollen. DNA may also be inserted into the chloroplast genome (Daniell et al., 1998).
- a plasmid expression vector suitable for the introduction of a PBGS gene in monocots using microprojectile bombardment is composed ofthe following: a CTP; a light inducible promoter; the PBGS gene; an intron that provides a splice site to facilitate expression ofthe gene, such as the Hsp70 intron (PCT Publication WO93/19189); and a 3' polyadenylation sequence such as the nopaline synthase 3' equence (NOS 3'; Fraley et al., 1983).
- This expression cassette may be assembled on high copy replicons suitable for the production of large quantities of DNA to be injected into the plant.
- Plasmid pMON530 is a derivative of pMON505 prepared by transferring the 2.3 kb Stul-Hindlll fragment of pMON316 (Rogers et al., 1987) into pMON526. Plasmid pMON526 is a simple derivative of pMON505 in which the Smal site is removed by digestion with Xmal, treatment with Klenow polymerase and ligation.
- Plasmid pMON530 retains all the properties of pMON505 and the CaMV35S-NOS expression cassette and now contains a unique cleavage site for Smal between the promoter and polyadenylation signal.
- Binary vector pMON505 is a derivative of pMON200 (Rogers et al., 1987) in which the i plasmid homology region, LIH, has been replaced with a 3.8 kb Hindlll to Smal segment of the mini RK2 plasmid, pTJS75 (Schmidhauser and Helinski, 1985).
- Plasmid pMON505 retains all the important features of pMON200 including the synthetic multi-linker for insertion of desired DNA fragments, the chimeric NOS/NPTII'/NOS gene for kanamycin resistance in plant cells, the spectinomycin/streptomycin resistance determinant for selection in E. coli and A. tumefaciens, an intact nopaline synthase gene for facile scoring of transformants and inheritance in progeny, and a pBR322 origin of replication for ease in making large amounts ofthe vector in E.
- Plasmid pMON505 contains a single T-DNA border derived from the right end ofthe pTiT37 nopaline-type T-DNA. Southern blot analyses have shown that plasmid pMON505 and any DNA that it carries are integrated into the plant genome, that is, the entire plasmid is the T-DNA that is inserted into the plant genome. One end ofthe integrated DNA is located between the right border sequence and the nopaline synthase gene and the other end is between the border sequence and the pBR322 sequences. Another particularly useful Ti plasmid cassette vector is pMON 17227.
- This vector is described in PCT Publication WO 92/04449 and contains a gene encoding an enzyme conferring glyphosate resistance (denominated CP4), which is an excellent selection marker gene for many plants, including potato and tomato.
- the gene is fused to the Arabidopsis EPSPS chloroplast transit peptide (CTP2) and expressed from the FMV promoter as described therein.
- CTP2 Arabidopsis EPSPS chloroplast transit peptide
- the cells (or protoplasts) are regenerated into whole plants.
- Choice of methodology for the regeneration step is not critical, with suitable protocols being available for hosts from Leguminosae (alfalfa, soybean, clover, etc.), Umbelliferae (carrot, celery, parsnip), Cruciferae
- the PBGS gene is derived from a species in which the PBGS enzyme does not comprise Mg 2+ but comprises Zn 2+ .
- the species is yeast or human.
- a mutant PBGS gene is used to generate a transgenic plant.
- the PBGS gene is introduced into the plant genome by homologous recombination.
- the wild type human PBGS genomic DNA and full length cDNA which may be used to generate a transgenic plant are shown below:
- compositions of the invention is suitable as antimicrobial active ingredients in personal care preparations, for example shampoos, bath additives, hair-care products, liquid and solid soaps (based on synthetic surfactants and salts of saturated and/or unsaturated fatty acids), lotions and creams, deodorants, other aqueous or alcoholic solutions, e.g.
- the invention therefore relates also to a personal care preparation comprising the composition of the invention and optionally cosmetically tolerable carriers or adjuvants as described in U.S. Patent No.6,689,372 to Holzl et al.
- the composition are to be used in amounts effective to have the antimicrobial effect, i.e. inhibit or prevent microbial activity.
- the invention provides a method of antimicrobial treatment of skin, mucosa or hair which comprises, contacting the surface ofthe skin, mucosa or hair of a person in need of said antimicrobial treatment with an antimicrobially effective amount ofthe compound ofthe invention.
- the personal care preparation according to the invention may be formulated as a water- in-oil or oil-in- water emulsion, as an alcoholic or alcohol-containing formulation, as a vesicular dispersion of an ionic or non-ionic amphiphilic lipid, as a gel, a solid stick or as an aerosol formulation.
- the cosmetically tolerable adjuvant contains, for example, from 5 to 50% of an oily phase, from 5 to 20% of an emulsifier and from 30 to 90% water.
- the oily phase may contain any oil suitable for cosmetic formulations, e.g.
- compositions according to the invention may be contained in a wide variety of cosmetic preparations as described in U.S. Patent No. 6,689,372 to Holzl et al. Especially the following preparations, for example, come into consideration: skin-care preparations, e.g. skin- washing and cleansing preparations in the form of tablet-form or liquid soaps, soapless detergents or washing pastes; bath preparations, e.g.
- lipsticks, lip gloss, lip contour pencils, nail- care preparations such as nail varnish, nail varnish removers, nail hardeners or cuticle removers
- intimate hygiene preparations e.g. intimate washing lotions or intimate sprays
- foot-care preparations e.g. foot baths, foot powders, foot creams or foot balsams, special deodorants and antiperspirants or callous-removing preparations
- light-protective preparations such as sun milks, lotions, creams and oils, sun blocks or tropicals, pre-tanning preparations or after-sun preparations
- skin-tanning preparations e.g. self-tanning creams
- depigmenting preparations e.g.
- preparations for bleaching the skin or skin-lightening preparations e.g. insect-repellents, e.g. insect-repellent oils, lotions, sprays or sticks; deodorants, such as deodorant sprays, pump-action sprays, deodorant gels, sticks or roll-ons; antiperspirants, e.g. antiperspirant sticks, creams or roll-ons; preparations for cleansing and caring for blemished skin, e.g. soapless detergents (solid or liquid), peeling or scrub preparations or peeling masks; hair-removal preparations in chemical form (depilation), e.g.
- insect-repellents e.g. insect-repellent oils, lotions, sprays or sticks
- deodorants such as deodorant sprays, pump-action sprays, deodorant gels, sticks or roll-ons
- antiperspirants e.g. antiperspirant sticks, creams or roll-ons
- hair-removing powders liquid hair-removing preparations, cream- or paste-form hair-removing preparations, hair-removing preparations in gel form or aerosol foams
- shaving preparations e.g. shaving soap, foaming shaving creams, non-foaming shaving creams, foams and gels, preshave preparations for dry shaving, aftershaves or after-shave lotions
- fragrance preparations e.g. fragrances (eau de Cologne, eau de toilette, eau de perfume, perfume de toilette, perfume), perfume oils or cream perfumes
- dental-care, denture-care and mouth-care preparations e.g.
- cosmetic hair- treatment preparations e.g. hair-washing preparations in the form of shampoos and conditioners, hair-care preparations, e.g. pretreatment preparations, hair tonics, styling creams, styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair-structuring preparations, e.g. hair-waving preparations for permanent waves (hot wave, mild wave, cold wave), hair- straightening preparations, liquid hair-setting preparations, foams, hairsprays, bleaching preparations; e.g. hydrogen peroxide solutions, lightening shampoos, bleaching creams,
- the oral composition according to the invention may be, for example, in the form of a gel, a paste, a cream or an aqueous preparation (mouthwash).
- the oral composition according to the invention may also comprise compounds that release fluoride ions which are effective against the formation of caries, for example inorganic fluoride salts, e.g. sodium, potassium, ammonium or calcium fluoride, or organic fluoride salts, e.g. amine fluorides, which are known under the trade name Olafluor.
- compositions ofthe invention are also suitable for the treatment of textile fibre materials.
- Such materials are undyed and dyed or printed fibre materials, e.g. of silk, wool, polyamide or polyurethanes, and especially cellulosic fibre materials of all kinds.
- Such fibre materials are, for example, natural cellulose fibres, such as cotton, linen, jute and hemp, as well as cellulose and regenerated cellulose.
- Preferred suitable textile fibre materials are made of cotton.
- the compositions of the invention can also be used in washing and cleaning formulations, e.g. in liquid or powder washing agents or softeners.
- the compositions of the invention are also suitable for imparting anti-microbial properties to plastics, e.g.
- compositions of the invention can be used especially also in household and all-pu ⁇ ose cleaners for cleaning and disinfecting hard surfaces.
- technical products such as paper treatment liquors, printing thickeners of starch or of cellulose derivatives, surface-coatings and paints, can be preserved and provided with antimicrobial properties.
- the compositions ofthe invention are also suitable for the antimicrobial treatment of wood and for the antimicrobial treatment of leather and the provision of leather with antimicrobial properties.
- compositions ofthe present invention can be used as an oral composition such as a dentifrice composition in association with an orally-acceptable carrier as described in U.S. Patent No. 6,740,311 to White, Jr., et al.
- oral composition are toothpastes, tooth powders, prophylaxis pastes, lozenges, gums and the like suitable for humans and animals.
- the compositions ofthe invention can be used to prepare antimicrobial surfaces.
- an antibacterial surface comprising: (1) providing the composition of the invention wherein the composition is effective to inhibit or prevent formation ofthe active form ofthe multimeric po ⁇ hobilinogen synthase and thereby inhibiting or preventing development or growth of bacteria, archaea, and/or eucarya, provided that the active form of the multimeric po ⁇ hobilinogen synthase contains an allosteric magnesium binding site and the composition is at least one of a drug, a toothpaste, a soap, a desinfectant, an anti-biofilm composition, and a herbicide; (2) providing a surface-forming matrix; and (3) combining the composition with the surface-forming matrix and thereby making the antibacterial surface.
- the antibacterial surface is adapted to prevent or inhibit a formation of a biofilm.
- a surface-forming matrix includes polymers, biodegradable and no-biodegradabe, silicas, ceramics and combinations thereof for mixing, layering or otherwise associating the composition with the matrix.
- the composition can also be put on the top or a bottom surface ofthe matrix.
- the multimeric porphobilinogen synthase contains no allosteric magnesium binding site.
- the invention will be illustrated in more detail with reference to the following Example, but it should be understood that the present invention is not deemed to be limited thereto.
- the well known quaternary state for PBGS is the octamer, made up of hugging dimers.
- PBGS neuropeptides
- some PBGS exist as an equilibrium of quaternary forms as shown by a protein concentration dependence to the specific activity.
- the protein concentration dependence to the specific activity indicates that a maximally active oligomer can dissociate or reassociate into smaller less active forms. It was previously believed that the smaller, less active forms, were also multiplicities of hugging dimers. Observation and characterization of a stable oligomer of detached dimers was made possible by the fact that PBGS in the QNW do not readily equilibrate between quaternary isoforms.
- F 12L mutation of human PBGS allowed us to study a stable form of the hexamer and to establish that it was the hexameric property (and not the specific F12L mutation) that dictated the dramatically different functional properties of F12L relative to wild type human PBGS.
- F 12L is naturally occurring rare allele for human PBGS (3- 5). Described below are studies of human PBGS (both wild type and F12L0 that were heterologously expressed in E. coli and purified by conventional techniques.
- PROTEIN EXPRESSION The parent human PBGS is the well-characterized N59/C 162A(6). N59 corresponds to the more soluble of two codominant alleles encoding the PBGS protein.
- C162A is a benign mutation that removes the possibility of a slowly forming aberrant disulfide bond.
- the artificial gene for N59/C162A is called Wt below.
- the sense strand primer used for the QuikChange mutagenesis of Wt to the F12L variant was GGCTACCTCCACCCACTGCTTCGGGCC.
- Several constructs were prepared for the coexpression of Wt and F12L in E. coli. Both the order ofthe genes and the number of promoters were varied, but these variations did not affect the outcome. The construct containing Wt and F 12L under the control of one promoter is described. Plasmid DNA containing Wt (pET3aWt) was digested with BamHl and Ndel to cut out Wt.
- the pETl 7b vector DNA was linearized by digestion with BamHl and Ndel and ligated with Wt such that the ATG start codon of Wt was 6 basepairs downstream ofthe ribosomal binding site encoded by the vector.
- the resultant plasmid was transformed into E. coli XL 1 blue.
- Plasmid DNA (pET17bWt) was prepared and linearized with Spel and Bpul l021. Plasmid DNA containing the gene F12L (pET3aF12L) was digested with Xbal and Bpul 1021 to produce a fragment containing the ribosomal binding site and the gene for F12L.
- the gene for F12L and the linearized pET17Wt vector were ligated such that the ribosomal binding site of the F12L gene was 35 basepairs downstream ofthe stopcodon of Wt, and the terminator was 52 basepairs downstream ofthe stop codon for the F12L gene.
- Plasmid pET17bWtF12L was transformed into E.coli XL 1 blue, plasmid DNA was prepared and transformed into E. coli BLR(DE3) for protein expression as previously described (6).
- PROTEIN PURIFICATION The bulk of the protein purification procedure (cell disruption, ammonium sulfate fractionation, hydrophobic chromatography on Phenyl-Sepharose, anion exchange chromatography, and gel filtration chromatography on Sephacryl S-300) followed the procedures previously described (6) with the exception that a 70 ml Q-Sepharose column was used in place ofthe DEAE agarose column for the anion exchange step.
- the Q-Sepharose was run at room temperature using 30 mM potassium phosphate, pH 7.0, 10 mM 2-mercaptoethanol, 10 ⁇ M Zn(II), and employed a KC1 gradient as shown in Fig. 3 A.
- ALA were 10 ⁇ M, 30 ⁇ M, 100 ⁇ M, 300 ⁇ M, 1 mM, 3 mM, and 10 mM and were each done in duplicate. Variations in the concentration of ALA-HCl did not lead to variations in final pH because the stock 0.1 M ALA-HCl was diluted into 0.1 M HCl prior to addition of a constant volume to the assay mixture. All assays were at 37°C for a fixed time using Ehrlich's reagent to determine po ⁇ hobilinogen formed.
- ANALYTICAL ULTRACENTRIFUGATION Protein samples were dialyzed into 30 mM potassium phosphate, pH 7.5, 0.1 mM DTT, and 10 ⁇ M ZnCl2 just prior to loading into the ultracentrifuge. Loading concentrations were
- Crystals were formed using the sitting drop method, equal volume of F12L (4.0 mg ml" 1 ) was mixed with the precipitant (0.4 M monoammonium hydrogen phosphate). ALA was added equimolar to the protein subunit concentration and crystals formed in 3-5 days. Diffraction data were collected at 100K on MAR345 image plate detector coupled with RU-200 rotating anode generator equipped with OSMIC optics and operated at 50kV and lOOma. Crystals were cryoprotected before freezing by transferring them at reservoir solutions containing 12%>, 17%, 23%o and 30%> glycerol for 3 min in each solution. A few data sets were collected showing high degree of disorder and lack of any ligand in the active site area.
- the structure was solved by molecular replacement with the AmoRe program package by using molecule A of human PBGS structure (pdb code 1E51) as an initial model. Refinement was carried out with program CNS .
- the final model included one dimer of F 12L - molecule A (residues 11-82, 97-124, 140-169, 172-212, 222-330) and B (residues 3-82, 97- 122, 140-169, 172-212, 226-328), one molecule of an intermediate product ofthe catalytic reaction bound in the active site of molecule A, 241 water molecules and two atoms of Zn which appear to have low occupancies.
- the crystallographic R-factor is 19.9%, R(free) is 28.6% for 2.2A resolution data, and the RMS deviations for bond lengths and bond angles are 0.18A and 2.0°, respectively. All residues belong to allowed conformation regions on the Ramachandran plot.
- THE PROPERTIES OF HUMAN PBGS VARIANT F12L Human PBGS variant F12L is remarkably different from the wild type protein. Characterization of purified F12L confirmed that the catalytic activity is very low under conditions where wild type human PBGS is most active. However, F 12L exhibits a remarkably altered pH rate profile and shows considerable activity at basic pH values (Fig. 1 A).
- PBGS exist in different oligomeric states.
- the molecular weight for the wild type protein and F 12L were found to be 244,000 ⁇ 8,900 and 197,900 ⁇ 6,500 Daltons, respectively.
- the former is midway between that expected for an octamer and a hexamer, while the latter is midway between that expected for a hexamer and a tetramer.
- the wild type protein fit best to a three-state model of dimer, hexamer, and octamer at 7.6%, 51%, and 42% respectively, while F 12L fit best to a two-state model of tetramer and hexamer at a ratio of 70%> to 30%>, with octamer absent.
- F 12L fit best to a two-state model of tetramer and hexamer at a ratio of 70%> to 30%>, with octamer absent.
- the catalytic core In each subunit the catalytic core resides completely within the barrel and a 20+ amino acid N-terminal arm is involved in extensive subunit interactions.
- the sequence ofthe catalytic core is phylogenetically conserved, but that of the N-terminal arm is not.
- the PBGS dimer seen in the octamer (Fig. 2A, top) involves highly conserved barrel-to-barrel contacts and the N-terminal arm of one subunit is hugging the barrel ofthe sister subunit. Hence, this has been referred to as the hugging dimer (2).
- the side chain of amino acid 12 does not participate in the hugging interaction. Assembly ofthe tetramer, which is by addition of a second hugging dimer rotated 90° around the central axis (Fig.
- Code 1PV8 reveals a quaternary structure that involves significant rearrangement of the N-terminal arm relative to the ⁇ / ⁇ barrel (Fig. 2B).
- the dimer retains the aforementioned barrel-to-barrel contacts but the N-terminal arms are detached rather than hugging (Fig. 2B, top).
- Assembly of the tetramer retains the aforementioned reciprocal interaction between the arm of one subunit and the base of an ⁇ / ⁇ barrel from a neighboring dimer.
- this association dictates a 120° rotation around the central axis.
- the new structure of F 12L (2.2 A resolution) contains significant regions of disorder that impede a structural comparison ofthe active site relative to the previously deposited wild type human PBGS structure (PDB code 1E51, 2.83 A resolution).
- Amino acid 12 does not interact directly with active site residues in either structure. Furthermore, for those amino acids observed in both structures, most are superimposable.
- the inventor undertook coexpression of F12L and wild type human PBGS.
- Pool I is comprised of heterohexamers and that Pool II is comprised of heterooctamers.
- the pH rate profiles are found to be dominated more by the quaternary structure than by the amino acid composition at position 12.
- the kinetic parameters K m and V max ofthe S300 purified pools were determined at pH
- Pool I and Pool II are the two pools of PBGS activity eluted from the Q-Sepharose column, as illustrated in Fig. 3A, and following further purification on a Sephacryl S-300 column.
- K m ⁇ and K m 2 (both mM) are inte ⁇ reted as the K m for the octamer and hexamer, respectively.
- the reported V max values (in units of ⁇ moles h"l mg" 1 ) reflect the mole fraction of quaternary species under assay conditions, which remains to be determined. Fitted K m values are independent ofthe distribution of quaternary species.
- the chemistry ofthe PBGS catalyzed reaction requires the formation of at least two Schiff base intermediates (2, 12, 16, 17, 20). Formation of the carbinolamine precursors to these Schiff bases requires that the participating amino groups are uncharged, or that the local pH is above the pK a of the amino groups.
- One significant structural difference between hexameric and octameric PBGS is the degree of order found in the amino acids that comprise the active site lid.
- the crystal structure of hexameric PBGS F12L is lacking in density from most ofthe residues that make up the active site lid, thus implying that the hexamer structure destabilizes the closed lid configuration.
- the PBGS catalyzed reaction cannot proceed until the external pH is above the pK a ofthe amino groups that participate in Schiff base formation.
- the hexameric structure is proposed to exhibit activity only when the external pH is sufficiently basic to facilitate Schiff base formation.
- the high Km can also be attributed to destabilization of the active site lid since crystal structures ofthe PBGS octamer show stabilizing interactions between residues on the lid and the substrate molecule that determines the Km value.
- the current results provide a novel approach to understanding the regulation of PBGS function. As described below, the insight provided from identification of a PBGS hexamer has considerable significance for rethinking the allosteric regulation of PBGS activity in non-human species.
- Fig.4 A shows the hugging dimer (light ribbon, dark strand) with the allosteric magnesium as black balls, one of which is illustrated with a large white-on-black arrow.
- the structures of yeast and human PBGS show that the guanidinium group of an arginine resides in the place ofthe allosteric magnesium as illustrated previously (2). This is Arg240 of human PBGS. If one presumes that all PBGS can exist in the hexameric state under appropriate conditions, then the position ofthe allosteric magnesium is pertinent to a hexamer-octamer transition because this metal binding site is present in the octamer (made up of hugging dimers) and absent in the hexamer (made up of detached dimers).
- Fig. 4B shows the three subunit to subunit interfaces in the PBGS octamer.
- the black-on-white arrow shows the barrel-to-barrel interface, which is common to both octameric and hexameric PBGS assemblies.
- the dots-on-black arrow shows the arm-to-base-of- barrel interaction, which is also common to both octameric and hexameric PBGS assemblies.
- the white-on-black arrow which is analogous to the allosteric magnesium binding site, shows the arm to barrel interaction that is present in the octamer (hugging dimer) and absent in the hexamer (detached dimer). Consistent with the notion that the allosteric magnesium mediates a hexamer-octamer equilibrium is the effect of magnesium on the kinetic parameters of E. coli PBGS. In this case, the addition ofthe allosteric magnesium causes the K m value to decrease from -2 mM to -200 Mm (8), which is remarkably reminiscent ofthe difference between the K m values ofthe hexameric and octameric forms of human PBGS (Table 1).
- Fig. 5B illustrates that removal of magnesium from pea PBGS disfavors the largest form in favor of a smaller form, where the mobility of the two forms is consistent with that of octamer and hexamer.
- the hexamer is a putative storage form ofthe PBGS protein because it is less active at physiologic pH and is characterized by a K m value that is well above the physiological concentration of ALA.
- the octamer is active at physiological pH and has a K m value that is in the proper range of ALA concentrations during active tetrapyrrole biosynthesis.
- HEXAMERIC HUMAN PBGS REVEALS A NOVEL STRUCTURAL PARADIGM FOR ALLOSTERIC REGULATION OF PROTEIN FUNCTION AND IS THE FIRST EXAMPLE OF A PROTEIN THAT CAN EXIST AS MORPHEINS : Characterization of the human PBGS variant F12L reveals that this point mutation causes a dramatic change in the structure and function of PBGS. This mutation can serve as a precedent for a single amino acid change resulting in significant changes in protein behavior during evolution. The F 12L mutation destabilizes the PBGS octamer and leads to formation of hexamers. The structural transition between octamer and hexamer must proceed through an unprecedented equilibrium containing two different dimer structures.
- the allosteric magnesium, present in most PBGS has a binding site in the octamer, but not in the hexamer.
- Native gel data indicate that removal of the allosteric magnesium favors formation of the hexamer over the octamer.
- the octamer-hexamer transition defines a novel mechanism for metal ion-dependent allosteric regulation of protein function.
- This invention describes inhibition of protein function through stabilization of the inactive mo ⁇ hein of PBGS and/or any other protein that might be regulated by the interconversion of mo ⁇ heins.
- the inventor is taking the following approach.
- the target molecule is one that will selectively bind to the "arm pit" of the hexamer as illustrated by the balls in Fig. 10.
- the inventor is taking an "in silico" approach of searching molecular libraries for molecules that will bind to the hexameric form of PBGS from the target organisms.
- the only existing crystal structure on which the inventor bases a model of target hexameric PBGS is that of human PBGS clinical variant F12L, PDB code 1PV8 (Breinig et al.
- a PBGS octamer for homology model building the alpha, beta-barrel domain of target PBGS.
- the chosen structure is PDB code 1GZG ( Frere, F., Schubert, W. D., Stauffer, F., Frankenberg, N., Neier, R, Jahn, D., and Heinz, D. W. (2002) JMol Biol 320, 237-247)
- Reference (20) is a highly ordered, high resolution crystal structures of Pseudomonas aeruginosa PBGS, itself a target for inhibitors that would "trap" the PBGS hexamer.
- aeruginosa PBGS was built using various capacities of Swiss-PDB Viewer (www.expasy.ch spdbv/mainpage.html) and other programs.
- the N-terminal arms were removed from the structure file for the 1GZG dimer.
- the resulting alpha, beta-barrel domains (residues 32-335) were successively overlaid upon the three dimers of hexameric 1PV8 to create a hexameric assembly ofP. aeruginosa PBGS alpha, beta - barrels.
- aeruginosa PBGS is missing residues 1-9 of subunits A, C, and E as well as residues 1-11 of subunits B, D, and F.
- the hexameric P. aeruginosa PBGS was the foundation structure for building a model of hexameric pea PBGS using well established published methods as we have done before (Kundrat, L., Martins, J., Stith, L., Dunbrack, R. L., Jr., and Jaffe, E. K. (2003) J Biol Chem 278, 31325-31330) In searching for molecules that will preferentially bind to hexameric PBGS, the following was discovered. Analysis of the hexamer of PBGS shows that the putative
- inhibitor binding site also referred to as the arm-pit contains elements ofthe three subunits A, B, and E.
- Subunits A and B comprise the already defined “detached dimer", where we typically depict the bottom subunit (subunit A, Fig. 15) such that the reader is looking directly into the active site in the center ofthe alpha, beta-barrel .
- Subunit B shares a barrel-to-barrel interface with subunit A.
- Subunit E shares a mutual interaction with subunit B wherein the N- terminal arm of one subunit is nested into the base ofthe alpha-beta-barrel ofthe other subunit.
- Fig. 15 shows the docked inhibitor, rosmarinic acid, described below.
- FIG. 16A open symbols, illustrates the protein concentration dependence of the specific activity of pea PBGS, which shows half maximal activity at 3.5 ⁇ g/ml PBGS.
- the equilibrium of quaternary isoforms contains about 50% octamer and about 50%) smaller less active isoforms (e.g. hexamers). If an inhibitor acted through preferential binding to these smaller forms, one would expect a more profound inhibition under conditions where the mo ⁇ hein equilibrium contains these smaller forms. In other words, the inhibitor would be expected to shift the protein concentration dependence to a higher protein concentration, which is shown for rosmarinic acid in FIG 16A (see below). Figs.
- FIG. 16B and 16C show experiments that were done to determine how best to demonstrate this shift in protein concentration dependence.
- FIG. 16B shows a dose response curve for pea PBGS, which indicates that the IC50 for rosmarinic acid is -63 ⁇ M, when the inhibitor is given 30 minutes to act on the protein prior to the addition of substrate. Not shown is the dependence of the inhibition on the preincubation time, where inhibition by any one concentration of rosmarinic acid increases with increasing preincubation time, showing that rosmarinic acid acts as a slow- binding inhibitor.
- Fig. 16C shows that once inhibition has taken place, the protein does not recover within a 30 minute assay time.
- the data obtained in Figs. 16A, 16B, and 16C, were used to choose the appropriate conditions necessary to demonstrate the effect of rosmarinic acid on the protein concentration dependence of pea PBGS, as follows. The closed circles of Fig.
- FIG. 16A show the protein concentration dependence ofthe specific activity of pea PBGS following a 30 minute treatment with 30 ⁇ M rosmarinic acid, which results in half maximal activity at 13.5 ⁇ g/ml PBGS.
- the equilibrium of quaternary forms has shifted from 3.5 ⁇ M to 13.5 ⁇ M; under these conditions and it takes 13.5 ⁇ g/ml PBGS to obtain an equilibrium with 50% octamer.
- Fig. 17 supports this conclusion with native gel electrophoresis data.
- Lanes 2 shows that pea PBGS will separate into at least two quaternary forms.
- the mobility on the gel is consistent with pea PBGS existing as an equilibrium of octamer and hexamer (see also FIG 5B).
- Lanes 1 and 3 show that the equilibrium is shifted to smaller fo ⁇ ns following treatment with rosmarinic acid.
- Lane 1 shows the effects of a 30 minute incubation of 250 ⁇ M rosmarinic acid on pea PBGS at 142 ⁇ g/ml and lane 3 shows the effect ofthe addition of 10 mM substrate on this quaternary structure equilibrium.
- the interactions of this biphenyl compound with the "arm pit" ofthe pea PBGS hexamer are predominantly through hydrogen bonds between the protein subunits A, B, and E and the polar moieties of the rosmarinic acid.
- the protein contains additional hydrogen bonding potential within 4.0 angstroms ofthe rosmarinic acid.
- a derivative ofthe rosmarinic acid can be made to have an improved binding by adding additional hydrogen bonding potential to the rosmarinic acid molecule. For instance, one could add a hydroxyl group at the 5 position of either phenyl moiety and improve hydrogen bonding to the protein.
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Pharmacology & Pharmacy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Epidemiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Communicable Diseases (AREA)
- Engineering & Computer Science (AREA)
- Oncology (AREA)
- Enzymes And Modification Thereof (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Cosmetics (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006518868A JP2007529995A (en) | 2003-07-07 | 2004-07-07 | Hexameric porphobilinogen synthase as a target for developing antibiotics and herbicides |
EP04786044A EP1648429A4 (en) | 2003-07-07 | 2004-07-07 | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides |
AU2004257208A AU2004257208B2 (en) | 2003-07-07 | 2004-07-07 | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides |
CA002531692A CA2531692A1 (en) | 2003-07-07 | 2004-07-07 | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides |
US11/327,762 US20060162014A1 (en) | 2003-07-07 | 2006-01-06 | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
IL173016A IL173016A (en) | 2003-07-07 | 2006-01-08 | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides |
US12/106,498 US7863029B2 (en) | 2004-06-04 | 2008-04-21 | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
US12/142,435 US8153410B2 (en) | 2003-07-07 | 2008-06-19 | Alternate morpheein forms of allosteric proteins as a target for the development of bioactive molecules |
US12/942,320 US20110207816A1 (en) | 2003-07-07 | 2010-11-09 | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US48525303P | 2003-07-07 | 2003-07-07 | |
US60/485,253 | 2003-07-07 | ||
US57731204P | 2004-06-04 | 2004-06-04 | |
US60/577,312 | 2004-06-04 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/327,762 Continuation-In-Part US20060162014A1 (en) | 2003-07-07 | 2006-01-06 | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2005007817A2 true WO2005007817A2 (en) | 2005-01-27 |
WO2005007817A3 WO2005007817A3 (en) | 2005-11-03 |
WO2005007817A9 WO2005007817A9 (en) | 2006-04-06 |
Family
ID=34083333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/021722 WO2005007817A2 (en) | 2003-07-07 | 2004-07-07 | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1648429A4 (en) |
JP (1) | JP2007529995A (en) |
AU (1) | AU2004257208B2 (en) |
CA (1) | CA2531692A1 (en) |
IL (1) | IL173016A (en) |
WO (1) | WO2005007817A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006138466A3 (en) * | 2005-06-15 | 2008-02-28 | Fox Chase Cancer Ct | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
US8153410B2 (en) | 2003-07-07 | 2012-04-10 | Fox Chase Cancer Center | Alternate morpheein forms of allosteric proteins as a target for the development of bioactive molecules |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69930619T2 (en) * | 1998-05-16 | 2006-12-28 | Mogam Biotechnology Research Institute, Yongin | USE OF ROSMARIC ACID AND ITS DERIVATIVES AS IMMUNOSUPPRESSOR OR AS INHIBITOR OF SH-2-MEDIATED PROCESSES |
JP4112730B2 (en) * | 1999-02-22 | 2008-07-02 | オリザ油化株式会社 | Antibacterial agent for oral cavity |
-
2004
- 2004-07-07 JP JP2006518868A patent/JP2007529995A/en active Pending
- 2004-07-07 WO PCT/US2004/021722 patent/WO2005007817A2/en active Application Filing
- 2004-07-07 EP EP04786044A patent/EP1648429A4/en not_active Ceased
- 2004-07-07 AU AU2004257208A patent/AU2004257208B2/en not_active Ceased
- 2004-07-07 CA CA002531692A patent/CA2531692A1/en not_active Abandoned
-
2006
- 2006-01-08 IL IL173016A patent/IL173016A/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of EP1648429A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8153410B2 (en) | 2003-07-07 | 2012-04-10 | Fox Chase Cancer Center | Alternate morpheein forms of allosteric proteins as a target for the development of bioactive molecules |
US7863029B2 (en) | 2004-06-04 | 2011-01-04 | Fox Chase Cancer Center | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
WO2006138466A3 (en) * | 2005-06-15 | 2008-02-28 | Fox Chase Cancer Ct | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
EP1898692A2 (en) * | 2005-06-15 | 2008-03-19 | Fox Chase Cancer Center | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
EP1898692A4 (en) * | 2005-06-15 | 2008-08-13 | Fox Chase Cancer Ct | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules |
JP2008546389A (en) * | 2005-06-15 | 2008-12-25 | フォックス チェイス キャンサー センター | Alternative morphine of allosteric protein as a target for developing bioactive molecules |
Also Published As
Publication number | Publication date |
---|---|
AU2004257208A1 (en) | 2005-01-27 |
IL173016A (en) | 2012-03-29 |
CA2531692A1 (en) | 2005-01-27 |
JP2007529995A (en) | 2007-11-01 |
WO2005007817A3 (en) | 2005-11-03 |
AU2004257208B2 (en) | 2010-02-25 |
EP1648429A2 (en) | 2006-04-26 |
EP1648429A4 (en) | 2009-09-02 |
IL173016A0 (en) | 2006-06-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8153410B2 (en) | Alternate morpheein forms of allosteric proteins as a target for the development of bioactive molecules | |
JP6995627B2 (en) | Compositions for treating pathological calcification conditions and methods of using them | |
EP0668933B1 (en) | Use of methioninase as an antitumor agent in anti-methionine chemotherapy | |
US6613553B1 (en) | Enoyl reductases and methods of use thereof | |
CA2341412A1 (en) | Rationally designed heparinases derived from heparinase i and ii | |
JP6665281B2 (en) | Human fibroblast growth factor-2 mutant with increased stability and use thereof | |
US20110207816A1 (en) | Alternate morpheeins of allosteric proteins as a target for the development of bioactive molecules | |
RU2652605C2 (en) | Blocking of inflammatory proteases by theta-defensins | |
AU2004257208B2 (en) | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides | |
WO2005007817A9 (en) | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides | |
WO2014059313A1 (en) | Thermally stable enzymes, compositions thereof and methods of using same | |
TWI754828B (en) | Powdery composition of ogg1 and uses thereof | |
US6638744B2 (en) | Canine cox-2 nucleic acid molecules and uses thereof | |
EP1069911A1 (en) | A novel nitroreductase and therapeutic uses therefor | |
CN100390286C (en) | Novel enzyme gene and its expression product | |
WO2020152532A1 (en) | Method of ameliorating a pro-inflammatory immunophenotype in farber disease subjects by repeated administration of a recombinant human acid ceramidase | |
CN113939586A (en) | Methods of treating beta-thalassemia | |
JP3355368B2 (en) | Plasmid vector containing cDNA encoding plant-derived epoxide hydrolase and transformant | |
TWI361041B (en) | Gene, protein and method for improving aroma production in plants | |
CN1835739A (en) | Hexameric porphobilinogen synthase as a target for the development of antibiotics and herbicides | |
HUT54208A (en) | Process for producing new serine protease inhibitor proteins, pharmaceutical compositions comprising same, dna sequences coding for such proteins and expression vectors containing such dna sequences | |
JPH10505747A (en) | Human inositol monophosphatase H1 | |
WO2010029378A2 (en) | Anti-protozoa compounds | |
WO2023028586A1 (en) | Use of taxifolin for treating systemic lupus erythematosus | |
Parker | Production and purification of imidazole glycerol phosphate dehydratase from Escherichia coli and Cryptococcus neoformans: Comparative kinetic and metal binding studies |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200480023403.2 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2531692 Country of ref document: CA Ref document number: 11327762 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2006518868 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004257208 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004786044 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2004257208 Country of ref document: AU Date of ref document: 20040707 Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 2004257208 Country of ref document: AU |
|
COP | Corrected version of pamphlet |
Free format text: PAGES 4, 9-14, 37, 39, AND 50, DESCRIPTION, REPLACED BY NEW PAGES 4, 9-14, 37, 39 AND 50; AFTER RECTIFICATION OF OBVIOUS ERRORS AUTHORIZED BY THE INTERNATIONAL SEARCH AUTHORITY |
|
WWP | Wipo information: published in national office |
Ref document number: 2004786044 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11327762 Country of ref document: US |