USRE35248E - Method for producing the Hinc II restriction endonuclease and methylase - Google Patents
Method for producing the Hinc II restriction endonuclease and methylase Download PDFInfo
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- USRE35248E USRE35248E US08/003,277 US327793A USRE35248E US RE35248 E USRE35248 E US RE35248E US 327793 A US327793 A US 327793A US RE35248 E USRE35248 E US RE35248E
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- C12N9/1007—Methyltransferases (general) (2.1.1.)
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- the present invention relates to clones for the Hinc II restriction endonuclease and modification methylase, and to the production of these enzymes from the clones.
- Restriction endonucleases are a class of enzymes that occur naturally in bacteria. When they are purified away from other contaminating bacterial components, restriction endonucleases can be used in the laboratory to break DNA molecules into precise fragments. This property enables DNA molecules to be uniquely identified and to be fractionated into their constituent genes. Restriction endonucleases have proved to be indispensable tools in modern genetic research. They are the biochemical ⁇ scissors ⁇ by means of which genetic engineering and analysis is performed.
- Restriction endonucleases act by recognizing and binding to particular sequences of nucleotides (the ⁇ recognition sequence ⁇ ) along the DNA molecule. Once bound, they cleave the molecule within, or to one side of, the sequence. Different restriction endonucleases have affinity for different recognition sequences. Over one hundred different restriction endonucleases have been identified among many hundreds of bacterial species that have been examined to date.
- Bacteria usually possess only a small number restriction endonucleases per species.
- the endonucleases are named according to the bacteria from which they are derived.
- the species Haemophilus aegypitus for example synthesize 3 different restriction endonucleases, named HaeI, HaeII and HaeIII.
- These enzymes recognize and cleave the sequences (AT)GGCC(AT), PuGCGCPy and GGCC respectivley.
- Escherichia coli RY13 synthesizes only one enzyme, EcoRI, which regoginizes the sequence GAATTC.
- a second component of bacterial protective systems are the modification methylases. These enzymes are complementary to restriction endonucleases and they provide the means by which bacteria are able to protect their own DNA and distinguish it from foreign, infecting DNA. Modification methylases recognize and bind to the same nucleotide recognition sequence as the corresponding restriction endonuclease, but instead of breaking the DNA, they chemically modify one or other of the nucleotides within the sequence by the addition of a methyl group. Following methylation, the recognition sequence is no longer bound or cleaved by the restriction endonuclease.
- DNA of a bacterial cell is always fully modified, by virtue of the activity of its modification methylase and it is therefore completely insensitive to the presence of the endogenous restriction endonuclease. It is only unmodified, and therefore identifiably foreign. DNA that is sensitive to restriction endonuclease recognition and attack.
- the key to isolating clones of restriction endonuclease genes is to develop a simple and reliable method to identify such clones within complex ⁇ libraries ⁇ , i.e. populations of clones derived by ⁇ shotgun ⁇ procedures, when they occur at frequencies as low as 10 -3 to 10 -4 .
- the method should be selective, such that the unwanted, majority, of clones are destroyed while the desirable, rare, clones survive.
- Type II restriction-modification systems are being cloned with increasing frequency.
- the first cloned systerms used bacteriophage infection as a means of identifying or selecting restriction endonuclease clones (HhaII Mann et al., Gene 3: 97-112, (1978); EcoRII: Kosykh et al., Molec. gen. Genet 178: 717-719, (1980); PstI: Walder et al., Proc. Nat. Acad. Sci. USA 78 1503-1507, (1981)).
- E. coli cloning plasmids E. coli cloning plasmids
- EcoRV Bougueleret et al., Nucleic Acids Res. 12:3659-3676, (1984); PaeR7: Gingeras and Brooks, Proc. Natl. Acad. Sci. USA 80:402-406, (1983); Theriault and Roy, Gene 19:355-359, (1982); PvuII: Blumenthal et al., J. Bacteriol. 164:501-509, (1985)).
- a potential obstacle to cloning restriction-modification genes lies in trying to introduce the endonuclease gene into a host not already protected by modification. If the methylase gene and endonuclease gene are introduced together as a single clone, the methylase must protectively modify the host DNA before the endonuclease has the opportunity to cleave it. On occasion, therefore, it might only be possible to clone the genes sequentially, methylase first then endonuclease.
- Another obstacle to cloning restriction-modification systems lies in the discovery that some strains of E.
- coli react adversely to cytosine or adenine modification; they posses systems that destroy DNA containing methylated cytosine (Raleigh and Wilson, Proc. Natl. Acad. Sci., USA 83:9070-9074, (1986)) or methylated adenine (Heitman and Model, J. Bact., 196:3243-3250, (1987); Raleigh, Trimarchi, and Revel, Genetics, (in press)). Cytoshine-specific or adenine-specific methylase genes cannot be cloned easily into these strains, either on their own, or together with their corresponding endonuclease genes. To avoid this problem it is neccesssary to use mutant strains of E. coli (McrA 31 and McrB - or Mrr - ) in which these systems are defective.
- a clone containing the genes for the Hinc II restriction endonuclease and modification methylase derived from Haemophilus influenzae Rc (NEB strain #126, a sample of which was deposited in the ATCC under designation number 53876), as well as related methods for the production of the enzymes. More specifically, this invention relates to clones which express the restriction endonuclease Hinc II, an enzyme which recognizes the DNA sequence GTPy PuAC and cleaves as indicated between the first 540 Py and Pu by the arrow. See Landy, Ruesdisueli, Robinson, and Ross, Biochemistry, 13:2134-2142 (1974); Kelly and Smith, J. Mol.
- the preferred method for cloning this enzyme comprises forming a library containing the DNA from Haemophilus influenzae Rc, isolating those clones which contain DNA coding for the Hinc II modification methylase and screening among these to identify those that also contain the Hinc II restriction endonuclease gene.
- FIG. 1 illustrates the scheme for cloning the Hinc II restrictin endonuclease.
- FIG. 2 illustrtes the scheme for producing the Hinc II restriction endonuclease.
- FIG. 3 is a restriction map of the 3.0 Kb Hind III fragment from Haemophilus influenzae Rc that encodes the Hinc II restriction endonuclease and modification methylase.
- the fragment was cloned into the Hind III site of pBIIHI.2 (ATCC 67902) to create p(pBIIHI.2)HincIIRM-8.0-AI and subsequently subcloned into pUC19 (ATCC 37254) to create p(pUC19)HincIIRM-5.7-4 and p(pUC19)Hinc IIRM-5.7-10
- FIG. 4 is a photograph of an agarose gel demonstrating Hinc II restriction endonuclease activity in cell extracts of E.coli RR1 (ATCC 31343) carrying (pUC19)Hinc IIRM-5.7-4 and p(pUC19)HincIIRM-5.7-10 (NEB #520).
- the present invention provides a method for cloning Hinc II restriction and modification genes and producing the restriction endonuclease Hinc II from clones produced thereby.
- This approach takes advantage of the fact that clone have been selected on the basis of containing expressed Hinc II restriction and methylase genes by the use of an endonuclease selection. Such clones are resistant to digestion in vitro by Hinc II restriction endonuclease.
- the present invention also relates to a method for cloning the Hind II modification and restriction genes and producing the Hind II restriction endonuclease from clones produced thereby.
- Hinc II restriction gene and methylase gene are preferably cloned and expressed.
- genomic DNA is digested fully with a restriction endonuclease such as Bgl II restriction endonuclease.
- the resulting Bgl II fragments are ligated into the Bgl II cloning site of a cloning vector, such as pBIIOI (ATCC 67901) or the BamH I site of pUC19 (ATCC 37254) or pBR322 (ATCC 37017) or pACYC177 (ATCC 37031) and the mixture is used to transform an appropriate host cell such as E. coli RRl cells which are mrr - .
- a cloning vector such as pBIIOI (ATCC 67901) or the BamH I site of pUC19 (ATCC 37254) or pBR322 (ATCC 37017) or pACYC177 (ATCC 37031) and the mixture is used to transform an appropriate host cell such as E. coli RRl cells which are mrr - .
- the transformed mixture is plated onto media selective for transformed cells, such as the antibiotics ampicillin, tetracycline, or chloramphenicol. After incubation, the transformed colonies are collected together into a single culture, the cell library.
- the recombinant plasmids are purified in toto from the cell library to make the plasmid library.
- the plasmid lbrary is digested to completion with the Hinc II restriction endonuclease, prepared from Haemophilus influenzae Rc by a method similar to that described in Watson et al, supra. Hinc II digestion differentially destroys unmodified, non-methylase-containing, clones, increasing the relative frequency of Hinc II methylase clones.
- the selected DNA is transformed back into an appropriate host such as E. coli RRl , and transformants are recovered by plating onto selective media.
- the colonies are picked and their DNA is analyzed for the presence of the Hinc II modification gene: the plasmids that they carry are purified and incubated with the Hinc II restriction endonuclease to determine whether they are resistant to digestion.
- Total cellular DNA chromosomal and plasmid
- the DNA of clones that carry the Hinc II modification gene should be fully modified, and both plasmid DNA and total DNA should be substantially resistant to digestion.
- the Hinc II restriction endonuclease is produced from Haemophilus influenzae Rc cells carrying the Hinc II restriction and modification genes. The cells are propagated in a fermenter in a rich medium containing ampicillin.
- the cells are harvested by centrifugation. 10
- the cells are disrupted by sonication to produce crude cell extract containing the Hinc II restriction endonuclease activity.
- the crude cell extract containing the Hinc II restriction endonuclease activity is purfied by standard ion-exchange and affinity chromatography techniques.
- the endonuclease so purified will be homogeneous on SDS polyacrylmide gel electrophoresis and to have a molecular weight of 27,000 daltons and a specific activity of approximately 250,000 units/mg of of protein titered on lambda DNA.
- the location of the endonuclease is mapped to the methylase as well as to the Haemophilus influenzae Rc and Haemophilus infuenzae Rd genomes.
- Haemophilus influenzae Rc genomic DNA is digested fully with a restriction endonuclease such as Hind III restriction endonuclease.
- Haemophilus influenzae Rd genomic DNA could be digested fully with a restriction endonuclease such as Cla I or EcoR I which generates fragments known to contain the Hind II modification and restriction genes.
- the resulting Hind III fragments are ligated into the Hind III cloning site of a cloning vector, such as pBIIHI.2 (ATCC 67902) or the Hind III site of pUC19, pBR322 or pACYC177 and the mixture is used to transform an appropriate host cell such as E. coli RR1 cells.
- a cloning vector such as pBIIHI.2 (ATCC 67902) or the Hind III site of pUC19, pBR322 or pACYC177 and the mixture is used to transform an appropriate host cell such as E. coli RR1 cells.
- the transformed mixture is plated onto media selective for transformed cells, such as the antibiotics ampicillin, streptomycin, or chloramphenicol. After incubation, the transformed colonies are collected together into a single culture, the cell library.
- the recombinant plasmids are purified in toto from the cell library to make the plasmid library.
- the plasmid library is digested to completion with the Hinc II restriction endonuclease, prepared from Haemophilus influenzae Rc by a method similar to that described in Watson et al, supra. Hinc II digestion differentially destroys unmodified, non-methylase-containing, clones, increasing the relative frequency of Hinc II methylase clones.
- the selected DNA is transformed back into an appropriate host such as E. coli RRl, and transformants are recovered by plating onto selective media.
- the colonies are picked and their DNA is analyzed for the presence of the Hinc II modification gene: the plasmids that they carry are purified and incubated with the Hinc II restriction endonuclease to determine whether they are resistant to digestion.
- Total cellular DNA chromosomal and plasmid
- the DNA of clones that carry the Hinc II modification gene should be fully modified, and both plasmid DNA and total DNA should be substantially resistant to digestion.
- Clones carrying the Hinc II restriction endonuclease are identified by preparing crude extracts of the clones which were determined to carry the Hinc II methylase gene, and assaying the crude extract for Hinc II restriction endonuclease activity.
- the level of Hinc II activity in the crude cell extract is determined to be approximately 1,000 units per gram of cells of the clone p(pBIIHI.2)HincIIRM-8.0A1.
- Hind III fragment containing the methylase and endonuclease genes was subcloned into Hind III cleaved and dephosphorylated pUC19.
- the clone containing the recombinant plasmids p(pUC19)HincIIRM-5.7-4 and p(pUC19)HincIIRM-5.7-10 which is positive for the Hinc II restriction endonuclease activity contains a single 3.0 Kb Hind III DNA fragment inserted into the Hind II cloning site of pUC19.
- restriction endonuclease sites for various restriction endonucleases were mapped on this plasmid and are shown in FIG. 3. The positions of the genes have been determined by deletion subcloning and mapping via Southern hybridizations using DNA oligomers as probes.
- the Hinc II restriction endonuclease is produced from cells carrying the Hinc II restriction and modification genes on the plasmid p(pUC19)HincIIRM-5.7-10.
- the cells are propagated in a fermenter in a rich medium containing ampicillin.
- the cells are disrupted by sonication to produce crude cell extract containing the Hinc II restriction endonuclease activity.
- the crude cell extract containing the Hinc II restriction endonuclease activity is purified by standard ion-exchange and affinity chromatography techniques.
- the endonuclease so purified is found to be homogeneous on SDS polyacrylmide gel electrophoresis and to have a molecular weight of 27,000 daltons and a specific activity of approximately 250,000 units/mg of protein titered on lambda DNA.
- Genomic DNA purification Approximately five grams of Haemophilus influenzae Rc cells were thawed and resuspended in 0.1M Tris-HCl, pH 7.1, 0.1M ETDA (25 ml) in a Corning plastic tube (50 ml). A solution of 60 mg of lysozyme in 36 ml of the above buffer was divided into two 50 ml plastic tubes and equal portions (15 ml) of the cell suspension added to each. The solutions were incubated at 37° C. for fifteen minutes. SDS was added from a 20% stock solution to adjust the final conc. of SDS to 1%. 200 ul of a Proteinase K (20 mg/ml stock) was added and incubated for one hour at 37° C.
- the twenty tubes were spun in the Ti70 rotor for 48 hrs at 44,000 rpm.
- the bands were removed and extracted with water saturated isobutanol.
- the solution was dialyzed against the same buffer (4) as before and then phenol and chloroform extracted (one time each). This solution was dialyzed once again to remove phenol and then subjected to electrophoresis.
- Bgl II to achieve total digestion as follows: 300 ul of DNA at 100 ug/ml in 10 mM Tris pH 7.5; 10 mM MgCl 2 , 100 mM NaCl, 10 mM mercaptoethanol buffer was dispensed into three tubes. To the tube was added 50 units of Bgl II. The tubes were incubated at 37° C. for one hour, then phenol/chloroform extracted and ethanol precipitated. The pellets were redissolved in 300 ul of 10 mM Tris-HCl, 1 mM EDTA, pH 8.0 and 10 ul from each analyzed by agarose gel electrophoresis.
- the fragmented DNA was ligated to pBIIOI (pBR322 with a Bgl II linker inserted into the EcoR I site) as follows: 10.0 ug of Bgl II digested Haemophilus influenzae Rc DNA (100 ul) was mixed with 2.0 ug of Bgl II-cleaved and dephosphorylated pBIIOI (20.0 ul) and ethanol precipitatd. The DNA was centrifuged at 12,000 g, 4° C. for 15 minutes and washed once with 100 ul 70% ethanol.
- the DNA was resuspended in 99 ul of 1X ligation buffer (50 mM Tris, pH 7.5, 10 mM MgCl 2 10 mM DTT, 0.5 mM ATP), 1 ul of T4 DNA ligase was added and the mixture allowed to incubate at 16° C. for 16 hours. Alquiots of 2.5 and 5.0 ul were used to transform E. coli strain RRl as follows: Each aliquot was mixed with 200 ul of ice-cold competent E. coli RRl cells and placed on ice for thirty minutes. After a 2-minute heat shock at 42° C., the cells were diluted with one ml of Luria-broth (L-broth) and grown for one hour at 37° C.
- 1X ligation buffer 50 mM Tris, pH 7.5, 10 mM MgCl 2 10 mM DTT, 0.5 mM ATP
- T4 DNA ligase was added and the mixture allowed to incuba
- the suspension was made 4.0 mg/ml in lysozyme and incubated at 25 degrees for 5 minutes. A 27 ml aliquot of 1% sodium dodecyl sulfate and 0.2 N NaOH was added followed by mixing of the solution and incubated for 5 minutes at 0 degrees. Genomic DNA was precipitated by the additon of 20 ml of ice-cold 3M potassium acetate, pH 4.8, vortexted gently for 10 seconds, left on ice for 5 minutes and centrifuged at 12,000 xg for ten minutes. The supernatant was removed and extracted with an equal volume of phenol/chloroform (1:1). The layers were separated by centrifugation at 10,000 xg for 5 minutes.
- the upper layer was removed and extracted with an equal volume of chloroform. The layers were separated by centrifugation at 10,000 g for 5 minutes. The upper layer was removed and the nucleic acids precipitated by the addition of two volumes of ethanol. The precipitate was collected by centrifugation at 12,000 xg for twenty minutes. The pellet was washed with 70% ehanol once and repelleted as before. The pellet was dried under vacuum and resuspended in 8 ml of 10 mM Tris-HCl, 1 mM EDTA, pH 8.0.
- the DNA solution was prepared for cesium chloride-ethidium bromide equilibrium density centrifugation by the additon of 8.9 grams of cesium chloride and 0.9 ml of a solution of ethidium bromide (5 mg/ml) were added.
- the DNA solution was centrifuged at 44,000 rpm for 48 hours and the resulting plasmid band of DNA was remobed with a syringe and 18 g needle.
- the ethidium bromide was removed by extracting with an equal volume of CsCl-water-saturated isopropanol.
- the cesium chloride was remobed by dialysis.
- the DNA was extracted with an equal volume of phenol/chloroform (1:1), and ethanol precipitated.
- the resultant DNA pellet was resuspended in 1.0 ml 10 mM Tris-HCl, 1 mM EDTA, pH8.0.
- the precipitate that formed was spun down at 12,000 xg, 4° C. for 10 minutes.
- the supernantant was removed and extracted with an equal volume of phenol/chloroform (1:1).
- the layers were separated by centrifugation at 10,000 xg for five minutes.
- the supernatant was poured into a centrifuge tube containing 880 ul of ethanol and mixed. After 10 minutes at room temperature, the tube was spun at 12,000 xg for 10 minutes to pellet the precipitated nucleic acids. The supernatant was discarded and the pellet was washed again with one mol of 70% ethanol-water, repelleted and dried at room temperature for 30 minutes under vacuum.
- the pellet was resuspended in 50 ul of 10 mM Tris, 1 mM EDTA, pH 8 0 containing 20 ug/ml RNase and incubated for 1 hour at 37° C. to digest the RNA.
- the plasmid minipreps were subsequently analyzed by digestion with Hinc II and Bgl II.
- Methylase Gene Clones 10% of the plasmids that were analyzed were found to be resistant to Hinc II and to carry a Bgl II fragment of approximately 6.2 Kb in length. These plasmids were subsequently shown to carry only the Hinc II modification methylase gene and not the restriction endonuclease gene. The other 90% of the plasmids looked at were not resistant to Hinc II and contained spurious fragment or were vector religated.
- Cell extracts were prepared as follows: Cells from one ml were pelleted by centrifugation at 4,000 rpm for five minutes. The supernatant was discarded and the pellet was resuspended in one ml of sonication buffer (10 mM Tris, pH 7.5, 100 mM NaCl, 5 mM DTT, 0.1 mM EDTA) and sonicated gently for two 10-second bursts to disrupt the cells. The tube was spun for ten minutes in a microfuge at 4° C., and the supernatant was used as the cell extract.
- sonication buffer 10 mM Tris, pH 7.5, 100 mM NaCl, 5 mM DTT, 0.1 mM EDTA
- the extract 1 ul and 5 ul, were incubated with one ug of lambda DNA in 50 ul of 1 ⁇ restriction endonuclease buffer for fifteen minutes at 37° C. Neither of the clones tested had endonuclease activity.
- Hinc II endonuclease from Haemophilus influenzae Rc desgnated NEB#126 was propagated in a fermenter at 37 degrees C. in TRY-YE Broth medium consisting of: tryptone, 10.0 g per liter; yeast extract 5.0 g per liter; NaCl, 2.0 g per liter; K 2 HPO 4 , 4.4 g per liter; glucose, 2.0 g per liter; hemin bovine, 10 mg per liter; NAD;DPN, 2.0 mg per liter.
- the cells are collected by centrifugation and the cell paste is used fresh or stored at -70°C.
- the cell paste (200 grams) is thawed and the cells are resuspended in 400 mls sonication buffer (20 mM K 2 PO 4 , pH7.3, 0.1 mM EDTA, 10 mM B-mercaptoethanol, 0.1M NaCl).
- the cells are disrupted by sonication (250 watts for two minutes, cooled on ice for five minutes, three times), to achieve release of approximately 50 mg of soluble protein per ml of suspended cells.
- the insoluble cell debris is removed by centrifugation at 21,000 ⁇ g for 20 minutes.
- the supernatant fluid is applied to a phosphocellulose column (5 ⁇ 35 cm) (Whatman P-11) equilibrated with 20 mM KH 2 PO 4 , pH 6.9, 100 mM NaCl, and 10 mM 2-mercaptoethanol.
- the column is washed with two column volumes of the above buffer.
- the flow-through from the column is collected in a single flask.
- Hinc II endonuclease is retained by the column and elutes between 0 3 and 0.6M NaCl.
- the most active fractions are pooled and dialyzed against 20mM K 2 PO 4 , pH7.3, 0.1 mM EDTA, 10 mM B-mercaptoethanol, 0.1M KCl.
- the dialyzed pool (50 ml) of Hinc II activity is applied to a 1 ml Mono Q FPLC column (Pharmacia) and washed with buffer S (20 mM K 2 PO 4 , pH6.9 10 mM B-mercaptoethanol, 0.05M KCl and a 40 ml linear gradient from 50 mM KCl to 01.0 M KCl is developed in S buffer and applied to the column.
- buffer S (20 mM K 2 PO 4 , pH6.9 10 mM B-mercaptoethanol, 0.05M KCl and a 40 ml linear gradient from 50 mM KCl to 01.0 M KCl is developed in S buffer and applied to the column.
- One ml fractions are collected and assayed for the presence of Hinc II restriction endonuclease activity.
- the center fractions containing the majority of Hinc II activity are applied to a 1 ml Poly Cat-A FPLC column (Pharmacia) and washed with buffer S (20 mM K 2 PO 4 , pH6.9 10 mM B-mercaptoethanol, 0.05M KCl and a 40 ml linear gradient from 50 mM KCl to 01 0 M KCl is developed in S buffer and applied to the column.
- buffer S (20 mM K 2 PO 4 , pH6.9 10 mM B-mercaptoethanol, 0.05M KCl and a 40 ml linear gradient from 50 mM KCl to 01 0 M KCl is developed in S buffer and applied to the column.
- One ml fractions are collected and assayed for the presence of Hinc II restriction endonuclease activity.
- the two most active fractions are homogeneous.
- the endonuclease was found to have a specific activity of approximately 250,000 units/mg protein
- DNA sequence was obtained that helped to determine the direction of the endonuclease and further defined the location of the amino terminal end of the endonuclease as well as the portion to the endonuclease gene that was present in p(pBIIOI)HincM-10 5-1.
- the DNA sequence obtained was the following: 5' .[.TAC TCA AAG TAT TTT GGA TAA ATA GTC CTA TAA TTG NNA.].
- the 25-mer oligomer was also used to map the endonuclease gene to varius restriction fragments of the Haemophilus influenzae Rc genome.
- sequence specific oligomer made to the vector DNA, and a deletion clone known to be located within the methylase gene, the direction of the methylase gene was determined in the same manner that the direction of the endonuclease gene was determined.
- step 20 Based on the data obtained in step 18, purified Haemophilus influenzae Rc genomic DNA (prepared as in step 1) was subjected to a limit digestion using Hind III as follows: 300 ul of DNA at 100 ug/ml in 10 mM mercaptoethanol buffer was dispensed into one tube. To the tube was added 50 units of Hind III. The tubes were incubated at 37° C. for one hour, then phenol/chloroform extracted and ethanol precipitated. The pellets were redissolved in 300 ul of 10 mM Tris-HCl, 1 mM EDTA, pH 8.0 and 10 ul from each analyzed by agarose gel electrophoresis.
- the fragmented DNA was ligated to pBIHI.2 (pN01523, with a Hpa I linker inserted into the Pvu II site and a Bgl IInker inserted into the EcoR I site) as follows: 10.0 ug of Hind III digested Haemophilus influenzae Rc DNA (100 ul) was mixed with 2.0 ug of Hind III-cleaved and dephosphorylated pBIIIH.2 (20.0 ul) and ethanol precipitated. The DNA was centrifuged at 12,000 g, 4° C. for 15 minutes and washed once with 100 ul 70% ethanol.
- the DNA was resuspended in 99 ul of 1 ⁇ ligation buffer (50 mM Tris, pH 7.5, 10 mM MgCl 2 10 mM DTT, 0.5 mM ATP), 1 ul of T4 DNA ligase was added and the mixture allowed to incubate at 16° C. for 16 hours. Aliquots of 2.5 and 5.0 ul were used to transform E. Coli strain RRl as follows: Each aliquot was mixed with 200 ul of ice-cold competent E. coli RRl cells and placed on ice for thirty minutes. After a 2-minute heat shock at 42° C., the cells were diluted with one ml of Luria-broth (L-broth) and grown for one hour at 37° C.
- 1 ⁇ ligation buffer 50 mM Tris, pH 7.5, 10 mM MgCl 2 10 mM DTT, 0.5 mM ATP
- T4 DNA ligase was added and the mixture allowed to incubate
- step 22 Primary Cell Library: Prepared as in step 4 with one additonal step: based on the data obtained from step 18, the libraries were probed with the sequence specific 25-mer oligomer (step 19), looking for a Hind III fragment of the appropriate size which was presumed to contain the endonuclease and methylase This fragment was present in the primary cell library.
- the 3.0 kb Hind III fragment from p(pBIIHI.2)HincIIRM-8.0-Al was gel prepped and used in a ligation reaction with Hind III cut and dephosphorylated pUC 19 in the following manner: 250 ng of the 2.7 kb gel prepped fragment (20 ul) was mixed with 100 ng(1 ul) of Hind III cut and dephosphorylated pUC 19 and ethanol precipitated. The DNA was centrifuged at 12,000 g. 4° C. for 15 minutes and washed once with 100 ul 70% ethanol.
- the DNA was resuspended in 10 ul of 1X ligation buffer (50 mM Tris, pH 7.5, 10 mM MgCl 2 10 mM DTT, 0.5 mM ATP), 1 ul of T4 DNA ligase was added and the mixture allowed to incubate at 16° C. for 16 hours. An liquots of 5.0 ul was used to transform E. coli strain RRl as follows: Each aliquot was mixed with 200 ul of ice-cold competent E. coli RRl cells and placed on ice for thirty minutes.
- 1X ligation buffer 50 mM Tris, pH 7.5, 10 mM MgCl 2 10 mM DTT, 0.5 mM ATP
- the cells were diluted with one ml of Luria-broth (L-broth) and grown for one hour at 37° C.
- the transformed cell cultures were centrifuged, resuspended in 250 ul volumes and plated onto Luria-agar (L-agar) plates containing 100 ug/ml ampicilin. After overnight incubation at 37° C., colonies were picked and plated onto LB agar containing ampicilin and incubated overnight at 37° C. Eighteen colonies, which were amp R were grown up in 10 ml cultures and the plasmids that they carried were prepared by the miniprep purification procedure described in step 6. The plasmid minipreps were subsequently analyzed by digestion with Hinc II and Hind III.
- Methylase Gene Clones Over 50% of the plasmids that were analyzed were found to be resistant to Hinc II digestion and to carry a Hind III fragment of approximately 3.0 Kb in length. These plasmids were subsequently shown to carry both the Hinc II modification methylase and restriction endonuclease genes. The remainder of the plasmids were pUC19 religated.
- Hinc II endonuclease was prepared as described in steps 9-16 with one alteration, the cells were grown in LB broth medium consisting of: 10 grams per liter, casein hydrolysate; 5 grams per liter, yeast extract; 10 grams per liter, NaCl; 1 gram per liter, magnesium chloride-hexahydrate; 1 gram per liter, glucose; 100 mg per liter ampicilin. The pH is adjusted to 7.2 with NaOH. The endonuclease purified was found to have a specific activity of approximately 250,000 units/mg protein.
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Abstract
Description
TABLE 1 __________________________________________________________________________ Amino Acid Sequence to mRNA (DNA) Sequence __________________________________________________________________________ 1letter code G A V L I S T D N E 3 letter code Gly Ala Val Leu Ile Ser Thr Asp Asn Glu mRNA 5' GGA GCA GUA CUA AUA UCA ACA GAC AAC GAA C C C C C C C U U G G G G G U G G U U U U U U or or UUA AGC G U __________________________________________________________________________ 1letter code Q K P H R F Y W C M 3 letter code Gln Lys Pro His Arg Phe Tyr Trp Cys Met mRNA 5' CAA AAA CCA CAC CGA UUC UAC UGG UGC AUG 3' G G C U C U U C G G U U or AGA G __________________________________________________________________________ Special Signals RNA Amino Acid Special Symbols B = D or N UAA = Ochre Z = E or Q UAG = Amber UGA = terminate Ambiguous nucleotide abbreviations These abbreviations conform to the proposed IUPAC-IUB standard abbreviations. A C G U/T U/T = U Uracil/Thymine G = G Guanine K = G U C = C Cytosine Y = C U Pyrimidine S = C G B = C G U A = A Adenine W = A U R = A G Purine D = A G U M = A C H = A C U V = A C G N/X = A C G U
Claims (13)
GTPyPuAC
GTPyPuAC
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US08/003,277 USRE35248E (en) | 1989-03-15 | 1993-01-12 | Method for producing the Hinc II restriction endonuclease and methylase |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/324,402 US5015581A (en) | 1989-03-15 | 1989-03-15 | Method for producing the Hinc II restriction endonuclease and methylase |
US08/003,277 USRE35248E (en) | 1989-03-15 | 1993-01-12 | Method for producing the Hinc II restriction endonuclease and methylase |
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US07/324,402 Reissue US5015581A (en) | 1989-03-15 | 1989-03-15 | Method for producing the Hinc II restriction endonuclease and methylase |
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USRE35248E true USRE35248E (en) | 1996-05-21 |
Family
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US07/324,402 Ceased US5015581A (en) | 1989-03-15 | 1989-03-15 | Method for producing the Hinc II restriction endonuclease and methylase |
US08/003,277 Expired - Lifetime USRE35248E (en) | 1989-03-15 | 1993-01-12 | Method for producing the Hinc II restriction endonuclease and methylase |
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US07/324,402 Ceased US5015581A (en) | 1989-03-15 | 1989-03-15 | Method for producing the Hinc II restriction endonuclease and methylase |
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US (2) | US5015581A (en) |
EP (1) | EP0388212B1 (en) |
JP (2) | JP2672683B2 (en) |
CA (1) | CA2012149C (en) |
DE (2) | DE69023789T2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5824529A (en) * | 1996-03-06 | 1998-10-20 | New England Biolabs, Inc. | Method for cloning and producing the PshAI restriction endonuclease |
EP2537925A1 (en) | 2005-08-04 | 2012-12-26 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases, and methods for identifying new endonucleases with the same or varied specificity |
Families Citing this family (9)
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US5200337A (en) * | 1991-10-25 | 1993-04-06 | New England Biolabs, Inc. | Type ii restriction endonuclease, apo i, obtainable from arthrobacter protophormiae and a process for producing the same |
JP3400124B2 (en) * | 1994-08-08 | 2003-04-28 | 株式会社日立製作所 | Pass transistor type selector circuit and logic circuit |
US5731185A (en) * | 1995-07-21 | 1998-03-24 | New England Biolabs, Inc. | Isolated DNA encoding the hphi restriction endonuclease and related methods for producing the same |
CN109880841A (en) * | 2018-12-31 | 2019-06-14 | 吴江近岸蛋白质科技有限公司 | A kind of preparation method of HindIII restriction endonuclease |
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-
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- 1990-03-15 EP EP90302817A patent/EP0388212B1/en not_active Expired - Lifetime
- 1990-03-15 DE DE69023789T patent/DE69023789T2/en not_active Expired - Lifetime
- 1990-03-15 JP JP2065542A patent/JP2672683B2/en not_active Expired - Lifetime
- 1990-03-15 DE DE90302817T patent/DE388212T1/en active Pending
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- 1993-01-12 US US08/003,277 patent/USRE35248E/en not_active Expired - Lifetime
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- 1997-05-09 JP JP11991397A patent/JP3156759B2/en not_active Expired - Lifetime
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EP0193413A2 (en) * | 1985-03-01 | 1986-09-03 | New England Biolabs, Inc. | Cloning restriction and modification genes |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US5824529A (en) * | 1996-03-06 | 1998-10-20 | New England Biolabs, Inc. | Method for cloning and producing the PshAI restriction endonuclease |
EP2537925A1 (en) | 2005-08-04 | 2012-12-26 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases, and methods for identifying new endonucleases with the same or varied specificity |
EP2540823A1 (en) | 2005-08-04 | 2013-01-02 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases and methods for identifying new endonucleases with the same or varied specificity |
EP2548953A1 (en) | 2005-08-04 | 2013-01-23 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases and methods for identifying new endonucleases with the same or varied specificity |
EP2562252A1 (en) | 2005-08-04 | 2013-02-27 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases and methods for identifying new endonucleases with the same or varied specificity |
EP2565267A1 (en) | 2005-08-04 | 2013-03-06 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases and methods for identifying new endonucleases with the same or varied specificity |
EP2565266A1 (en) | 2005-08-04 | 2013-03-06 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases and methods for identifying new endonucleases with the same or varied specificity |
EP2568040A1 (en) | 2005-08-04 | 2013-03-13 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases and methods for identyfing new endonucleases with the same or varied specificity |
EP2574668A1 (en) | 2005-08-04 | 2013-04-03 | New England Biolabs, Inc. | Novel restriction endonucleases, DNA encoding these endonucleases and methods for identifying new endonucleases with the same or varied specificity |
Also Published As
Publication number | Publication date |
---|---|
DE388212T1 (en) | 1994-02-03 |
JP2672683B2 (en) | 1997-11-05 |
US5015581A (en) | 1991-05-14 |
CA2012149C (en) | 1999-11-16 |
EP0388212B1 (en) | 1995-11-29 |
JPH0322978A (en) | 1991-01-31 |
JPH1080284A (en) | 1998-03-31 |
DE69023789T2 (en) | 1996-08-08 |
DE69023789D1 (en) | 1996-01-11 |
JP3156759B2 (en) | 2001-04-16 |
CA2012149A1 (en) | 1990-09-15 |
EP0388212A1 (en) | 1990-09-19 |
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