WO2012026743A2 - 라벨링제 및 이를 이용한 아미노산 서열 및 단백질 다중 정량 동시 분석방법 - Google Patents
라벨링제 및 이를 이용한 아미노산 서열 및 단백질 다중 정량 동시 분석방법 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
- C07C237/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton
- C07C237/04—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton the carbon skeleton being acyclic and saturated
- C07C237/12—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton the carbon skeleton being acyclic and saturated having the nitrogen atom of at least one of the carboxamide groups bound to an acyclic carbon atom of a hydrocarbon radical substituted by carboxyl groups
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C233/00—Carboxylic acid amides
- C07C233/01—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
- C07C233/45—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups
- C07C233/46—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom
- C07C233/47—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom having the carbon atom of the carboxamide group bound to a hydrogen atom or to a carbon atom of an acyclic saturated carbon skeleton
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C233/00—Carboxylic acid amides
- C07C233/01—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms
- C07C233/45—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups
- C07C233/46—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom
- C07C233/51—Carboxylic acid amides having carbon atoms of carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms having the nitrogen atom of at least one of the carboxamide groups bound to a carbon atom of a hydrocarbon radical substituted by carboxyl groups with the substituted hydrocarbon radical bound to the nitrogen atom of the carboxamide group by an acyclic carbon atom having the carbon atom of the carboxamide group bound to an acyclic carbon atom of a carbon skeleton containing six-membered aromatic rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
- C07C237/02—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton
- C07C237/20—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atoms of the carboxamide groups bound to acyclic carbon atoms of the carbon skeleton the carbon skeleton containing six-membered aromatic rings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6803—General methods of protein analysis not limited to specific proteins or families of proteins
- G01N33/6848—Methods of protein analysis involving mass spectrometry
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B2200/00—Indexing scheme relating to specific properties of organic compounds
- C07B2200/05—Isotopically modified compounds, e.g. labelled
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2458/00—Labels used in chemical analysis of biological material
- G01N2458/15—Non-radioactive isotope labels, e.g. for detection by mass spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2560/00—Chemical aspects of mass spectrometric analysis of biological material
Definitions
- the present invention relates to a labeling agent and a method for quantitative analysis of amino acid sequences and proteins using the same, and more particularly, to a labeling agent capable of displaying strong quantitative signals and a method for simultaneous analysis of amino acid sequences and proteins using the same.
- Mass spectrometry is widely used to identify and quantify proteins and peptides. For example, peptides resulting from enzyme breakdown of proteins are ionized using Matrix-Assisted Laser Desorption / Ionization (MALDI) or Electrospray Ionization (ESI), and then mass is accurately measured using a mass spectrometer. The identity of the protein is determined by comparison with the peptide information given by the gene sequence, and more specifically, some peptides are selected by mass spectrometry to obtain a sequence of peptides from fragment ions resulting from collision decomposition with gas. It also reveals the identity of.
- MALDI Matrix-Assisted Laser Desorption / Ionization
- ESI Electrospray Ionization
- mass spectrometry In quantitative analysis of proteins and peptides, mass spectrometry is widely used by labeling chemical markers containing isotopes to proteins or peptides to be analyzed. Mass spectrometric analysis of different protein and peptide samples of the same type to be quantitatively labeled with the same chemical label with different isotope labeling results in mass spectrometry or tandem mass spectrometry This appears differently and quantitative analysis is possible by comparing the relative abundance.
- Homologous chemical labeling is used to simultaneously identify and quantify the proteins or peptides described above.
- U.S. Patent Publication No. US 2005/0148087 and International Patent Publication No. WO 2005/068446, etc. disclose homopolymer chemical labels designed to show quantitative signals in tandem mass spectrometry upon collisional degradation with peptides.
- the labeling agents suggested by the literature use isotopes such as carbon-13, nitrogen-15, or oxygen-18, and thus have limitations in the synthesis of various isomers and are expensive.
- the quantitative analysis using the previously disclosed homopolymer labeling reagents cannot be used in a quadrupole ion trap mass spectrometer such as a Paul trap and a linear ion trap. Accordingly, there is a need for a new homopolymer labeling agent capable of confirming the amino acid sequence and the amount of protein at the same time using hydrogen isotopes that can be variously substituted and relatively inexpensive hydrogen isotopes.
- Tandem mass spectrometry in this quadrupole ion trap is generally, but not limited to, a technique called Resonant Excitation Collision-Induced Dissociation (RE-CID).
- RE-CID Resonant Excitation Collision-Induced Dissociation
- the mass-to-charge ratio of the fragment ions is less than about 1/3 of the mass-to-charge ratio of the mother ion, it is not stably collected in the ion trap and is not detected. This is called a 'low-mass cutoff' effect.
- the homopolymer labeling agents used in the existing technologies use fragment ions with masses as small as 100-200 Da as the quantitative signal, which prevents the detection of quantitative signal ions due to the low-mass cutoff effect in the quadrupole ion trap mass spectrometer. have. Further, in the mass region of 100-200 Da, internal fragment ions having a small mass derived from an analyte protein or peptide are very likely to interfere with quantitative signal ions, so that accurate quantitative analysis may not be possible.
- the material described in the above patent has a critical limit that can be used in the quadrupole ion trap mass spectrometer because only a low mass fragment ion can be analyzed. Accordingly, there is a need for the invention of a homopolymer labeling substance which can be used without limitation in the most widely used quadrupole ion trap mass spectrometer and an analysis method using the same.
- the quantitative signal needs to appear as a fragment ion having a sufficiently large mass. Fragment ions with large masses have a very low probability of being disturbed by noise signals compared with small mass ions and are highly valuable because they are not limited to the low-mass cutoff that can occur in quadrupole ion traps.
- the present inventors through the Republic of Korea Patent Application No. 2008-0070272, using a hydrogen isotope only, it is possible to control the mass of the quantitative signal, a new homologous labeling named MBIT (Mass-balanced isotope tag) having a dipeptide structure I have presented you.
- MBIT Mass-balanced isotope tag
- the mass regulator is modified to vary the physical properties and quantitative signal mass of the homopolymer labeling agent.
- variable mass labeling agent and the labeling agent set have been presented, and the multi- quantitative method, which is a simultaneous multiple quantitative analysis of three or more samples using two or more labeling agents, has been presented. It is possible to synthesize easy and inexpensive homologous labeling agent by the above method and quantify multiple samples.However, when multi quantification is carried out by multi 2-plex quantitative method, the sample which is used as a reference is high and the sample to be analyzed at one time. There is also a problem that increases the total amount of.
- the inventors found that while using a hydrogen isotope and researching a labeling agent capable of quantitating multiple samples at once while reducing the synthesis cost of the labeling agent, it was confirmed that this object was achieved through a new chemical structure.
- the present invention was completed.
- the strength of the quantitative signal is weakened and the quantitative accuracy is reduced by improving the prior art to confirm that the quantitative signal is generated strongly during tandem mass analysis to complete the present invention.
- the inventors of the present invention while studying the analysis method that can be applied to the quadrupole ion trap mass spectrometer using the homopolymer labeling agent presented by the present inventor, confirmed the method that can be analyzed through the quantitative signal ion having a large mass Using this, it was confirmed how to quantify the relative amounts of peptides and proteins in all mass spectrometers including quadrupole ion trap mass spectrometer, and completed the present invention.
- the present invention is to provide a compound having a new chemical structure capable of quantifying multiple samples at once while utilizing hydrogen isotopes and at the same time reducing the synthesis cost of the labeling agent.
- the present invention is to provide a composition comprising two or more kinds of the compound.
- the present invention is to provide a new quantitative analysis method that can simultaneously quantify two or more types of analytes using the compound or the composition.
- the present invention is a method for quantitative analysis of two or more amino acid sequences and homologous variable mass labeling agent for protein multiple quantitative simultaneous analysis, including hydrogen isotopes, detected at a mass value greater than the analyte. It is to provide.
- the present invention provides a compound represented by the following formula (1).
- R 1 is C 1-10 alkyl or ego
- R 2 is C 1-10 alkyl or ego
- R 3 is the side chain of the amino acid residue
- R 4 is hydroxy or a reactive linker
- R 5 is hydrogen, C 1-4 alkyl or C 2-4 alkynyl
- R 6 is hydrogen, C 1-4 alkyl or C 2-4 alkynyl
- n and m are each independently an integer from 1 to 4.
- R 1 and R 2 do not include deuterium, or at least one of R 1 and R 2 includes deuterium.
- the quantitative signal of the compound represented by Formula 1 is 4- (1-propynyl) benzyl cation.
- R 1 contains deuterium, which may result in different quantitative signals.
- quantitative signals are 129 Th (CH 3 CCHCC 6 H 4 CH 2 + ) and 131 Th (CH 3 C ⁇ CC 6 H 4 CD 2 + ), it is possible to 132 Th (CD 3 C ⁇ CC 6 H 4 CH 2 +) or 134 Th (CD 3 C ⁇ CC 6 H 4 CD 2 +).
- R 1 is C 6-9 alkyl or ego
- R 2 is C 6-9 alkyl or ego
- R 5 is hydrogen, propyl or prop-1-ynyl
- R 6 is hydrogen, propyl or prop-1-ynyl
- n and m are each independently an integer of 1-4.
- R 1 is octyl
- R 2 is heptyl
- R 1 and R 2 are preferably the same kind, that is, R 1 is C 1-10 alkyl, R 2 is C 1-10 alkyl; Or R 1 is R 2 is Is preferably.
- R 1 and R 2 are
- Each is CD 3 C ⁇ CC 6 H 4 CH 2 and CH 3 C ⁇ CC 6 H 4 CD 2 CH 2 ; or
- they are CD 3 C ⁇ CC 6 H 4 CD 2 and CH 3 C ⁇ CC 6 H 4 CH 2 CH 2 , respectively.
- R 3 is a side chain of a residue of an amino acid, which is attributable to having a structure in which R 1 and R 2 are substituted with an amine group of an amino acid.
- amino acid as used in the present invention means a natural amino acid or an artificial amino acid, and preferably means a natural amino acid.
- the amino acid means glycine, alanine, serine, valine, leucine, isoleucine, methionine, glutamine, asparagine, cysteine, histidine, phenylalanine, arginine, tyrosine or tryptophan.
- side chain of the amino acid residue means a group of the structure of the amino acid substitutions in the remaining structure, that is, the NH 2 CH 2 CH 2 COOH, except the NH 2 CH 2 COOH.
- side chain of the residue of glycine means hydrogen and for serine the side chain of the residue of serine means hydroxymethyl.
- the R 3 can be freely adjusted according to the type of amino acid, and thus also the control of the quantitative signal.
- R 4 is a hydroxy or a reactive linker.
- the term "reactive linker” refers to a reactor that allows the compound of Formula 1 to be combined with the analyte.
- a reactor capable of reacting with an amine group or a hydroxyl group present in the protein or peptide is preferable.
- succinimide-N-oxy, 3-sulfosuccinimide-N-oxy, benzotriazol-1-yloxy, pentahalobenzyloxy, 4-nitrophenoxy or 2-nitrophenoxy This is not restrictive.
- R 4 is hydroxy, since the general formula (1) is a compound having a carboxyl group as a whole, the carboxyl group may be a carbonyl group substituted with a reactive linker.
- the present invention provides a composition comprising two or more kinds of the compound represented by the formula (1).
- two or more kinds means that two or more kinds of compounds having different chemical structures from each other are included, and preferably two to four kinds of compounds are included. More preferably, it is preferable to include two or more kinds of compounds having the same chemical structure only for the substitution of deuterium and hydrogen.
- the two or more compounds are preferably the same number of deuterium. Since the chemical structure of each other is not the same, but the number of deuterium is the same, the mass difference of the ions indicating the quantitative signal is generated, so that the mass of each sample appears differently on the mass spectrometry or tandem mass spectrometry. Quantitative analysis is possible by comparing and analyzing quantities.
- composition containing any one or more compounds chosen from the group which consists of the following compounds is mentioned:
- the present invention also provides a method for quantitating analytes using a compound represented by Formula 1 or a composition comprising two or more types of compounds represented by Formula 1.
- the compound In order to quantify the analyte, the compound must be bound to the analyte, and the compound and the analyte are separated by the linker reacting with the amine of the analyte and separating as a living group.
- the analyte is characterized in that the protein, carbohydrate or lipid. In addition, the analyte is characterized in that the peptide. In addition, the analyte is characterized in that the nucleic acid or a nucleic acid derivative. In addition, the analyte is characterized in that the steroid.
- the present invention comprises the steps of binding a composition comprising two or more compounds represented by the formula (1) to the analyte; And dissolving the analyte to provide quantitative analysis of amino acid sequence and protein comprising the step of quantifying the analyte.
- the decomposition method for the quantification is preferably tandem mass spectrometry.
- the quantitative signal giving the quantitative signal mass is 129 Th (CH 3 C ⁇ CC 6 H 4 CH 2 + ), 131 Th (CH 3 C ⁇ CC 6 H 4 CD 2 + ), 132 Th (CD 3 a C ⁇ CC 6 H 4 CH 2 +) or 134 Th (CD 3 C ⁇ CC 6 H 4 CD 2 +).
- the present invention provides a method for preparing a compound represented by Chemical Formula 1, and a specific manufacturing method will be described with reference to FIGS. 3 to 5.
- the compound represented by Chemical Formula 1 is synthesized using a reporter unit in the form of a haloalkan, a balance unit in the form of a carboxylic acid, and an esterified amino acid.
- the compound represented by the formula (1) containing deuterium can be prepared by using the same after the reaction to introduce the deuterium to the reporter unit and the balance unit.
- a method for introducing deuterium a method known in the art may be used. Specifically, the method described in FIG. 2 can be used.
- One method for introducing deuterium is to replace hydrogen in terminal alkyne with deuterium in basic deuterium (D 2 O), and one carbonyl group is sodium borohydride (NaBD 4 ) or lithium deuterated aluminum (LiAlD 4 ). There is a method of partially reducing.
- the introduction of two deuteriums is carried out using a method of reducing alkene to deuterium gas (D 2 ) under a metal catalyst, a method of reducing carbonyl groups of peptide bonds or ester bonds to LiAlD 4 and sodium methoxide (NaOCD 3 ). There is a method of introducing deuterium at the alpha position of the ester compound.
- Three deuteriums can be introduced by alkylation of secondary amines or terminal alkyne using methane iodide- d 3 (CD 3 I).
- the introduction of four deuteriums includes the reduction of two carbonyl groups using LiAlD 4 and the reduction of alkyne to D 2 under a metal catalyst.
- a combination of a method of introducing two deuteriums by reducing a carbonyl group of an ester bond with LiAlD 4 and a method of introducing three deuteriums by alkylating alkyne with CD 3 I 4 was synthesized.
- the reporter unit was first synthesized, and a part of the synthesized reporter unit was transformed into three additional reactions to synthesize a balance unit.
- a detailed reporter unit and a method of manufacturing the balance unit will be described with reference to FIG. 4. do.
- the synthesis method of the reporter unit is as follows.
- Trimethylsilyl (TMS) protected alkyne is introduced into 4-bromobenzoic acid methyl ester via Sonogashira coupling using a palladium catalyst and cuprous iodide. The ester is then reduced to alcohol.
- TMS Trimethylsilyl
- LiAlH 4 lithium aluminum hydride
- LiAlD 4 lithium deuterated aluminum
- TBSCl butyl-dimethylsilane
- TBS dimethylsilane
- Methyl iodide- d 0 (CH 3 I) or -d 3 (CD 3 I) is introduced into the terminal alkyne thus produced, to introduce methyl- d 0 or -d 3 .
- the TBS is then removed using tetra-n-butylammonium fluoride (TBAF).
- TBAF tetra-n-butylammonium fluoride
- the resultant compound is treated with methanesulfonic acid chloride and replaced with iodine using sodium iodide to synthesize a reporter unit.
- a total of four reporter units are obtained according to the combination of LiAlH 4 / LiAlD 4 and CH 3 I / CD 3 I.
- Using LiAlH 4 and CH 3 I produces deuterium-free reporter- d 0
- using LiAlD 4 and CH 3 I produces reporter- d 2 containing two deuteriums
- LiAlH 4 and CD 3 I When used, reporter- d 3 containing three deuteriums is generated, and reporter- d 5 containing five deuteriums is generated by using LiAlD 4 and CD 3 I.
- Part of the synthesized reporter unit is used to alkylate diethyl malonic acid. After removing one carboxylic group of malonic acid through reflux, a balance unit is synthesized by hydrolyzing ethyl ester with an aqueous sodium hydroxide solution. Since deuterium is not used to transform the reporter unit into the balance unit, the number of deuteriums in the balance unit is determined by the reporter unit used.
- the synthesized compound and balance- d 5-n were converted into 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide (EDC), 1-hydroxybenzotriazole (HOBt), and N, N-diisopropyl.
- the coupling reaction was carried out using ethylamine (DIPEA), and hydrolysis of the methyl ester with an aqueous sodium hydroxide solution yielded an acid homologous labeling agent tag ⁇ 129 + n having a mass value of 129 + n.
- tag ⁇ may be manufactured by a method similar to the above.
- the present invention comprises the steps of combining the labeling agent comprising a compound represented by the formula (2) with the analyte (step 1); Ionizing the conjugate to generate fragment ions (step 2); And quantifying fragment ions comprising the analyte and R C in the fragment ions (step 3).
- R A is straight or branched C 1 -C 18 alkyl
- R B is a mass regulator
- R C is straight or branched C 1 -C 18 alkyl
- Linker is a reactive linker that induces binding with the analyte
- R A and R C are the same alkyl and at least one comprises at least one deuterium.
- Step 1 is a step of binding the labeling agent represented by the formula (2) with the analyte, the step of binding the labeling agent to the analyte for use in subsequent quantitative analysis.
- the linking is a linker of the labeling agent and an amine group of the analyte react to be bound.
- the binding method is as described in Korean Patent Publication No. 2010-0009466, Korean Patent Publication No. 2010-0009479, and International Patent Publication No. WO 10/008159, which bind by linker reaction of an amine group and Linker known in the art. You can.
- two or more labeling agents represented by Formula 2 may be combined.
- labeling agent used in the present invention means a compound represented by Chemical Formula 2, and the compound is Korean Patent Publication No. 2010-0009466, Korean Patent Publication No. 2010-0009479, and International Patent Publication. As described in No. WO 10/008159, which is incorporated by reference.
- Linker means an active ester which becomes a living group in the nucleophilic attack of amines.
- the amine is characterized in that the primary amine.
- the reactive linker is a group consisting of N -hydroxysuccinimidyl group, N -hydroxysulfosuccimidyl group, benzotriazol-1-yloxyl group, pentahalobenzyl group, 4-nitrophenyl group and 2-nitrophenyl group. Can be selected from.
- the term "the mass regulator (R B )" used in the present invention when combined with the analyte and decomposed in the mass spectrometry, controls the mass of the N -acylated amino acid fragment so that the quantitative signal is different in the spectrum. Introduced so as not to overlap with the fragments. By changing the type of R B , the mass of the quantitative signal can be varied in various ways.
- the mass regulator may be one of the side chains of natural or artificial amino acid residues of similar or identical properties.
- the mass regulator is characterized by having similar or identical physical properties.
- the mass control group may be C 1-18 linear or branched alkyl, and for example, may be linear or branched alkyl such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, or octyl. .
- the R A and R C are the same alkyl and at least one includes deuterium, and serves to enable quantitative analysis by mass difference of isotopes.
- R A and R C are methyl or methyl comprising one or more deuterium, or wherein R A and R C are each ethyl and at least one of R A and R C comprises one or more deuterium It features.
- R A and R C are made of alkyl having the same number of carbons, the number of deuterium included should be different.
- R A and R C are preferably CH 3 and CD 3 or CD 3 and CH 3 , respectively.
- R A and R C in the compound if R A is CH 3 R C is a CD 3, and, R C is R A is CH 3 is CD 3.
- R A and R C are each preferably C 2 H 5 and C 2 D 5 , or C 2 D 5 and C 2 H 5 , respectively. That is, R A and R C are the above compounds, R A is C 2 H 5 when R C is a C 2 D 5 a, R C is C 2 H 5 when R A is C 2 D 5.
- Formula 2 is characterized in that the N- terminal is acylated, C- terminal is a dipeptide is attached to a linker attached to the living group in the nucleophilic attack of the amine and isotopically labeled.
- the dipeptides are characterized in that the dipeptides labeled with deuterium.
- Figure 13 schematically shows the chemical structure of the labeling agent.
- the compounds disclosed in the patent application Korean Patent Publication No. 2010-0009466, Korean Patent Publication No. 2010-0009479, and International Patent Publication No. WO 10/008159) were named "MBIT" and are not theoretically limited, but N The end is acylated and has a structure of dipeptides with a linker attached to the C-terminus.
- FIG. 14 is a diagram schematically showing the binding of MBIT substances in peptides and proteins, although not limited in theory.
- binding can also occur with primary amines of lysine side chains. Therefore, when the labeling agent is bound to one peptide or protein, two or more labeling agents may be multiplexed depending on the number of lysines included in the protein and the peptide. Even if the analyte is not necessarily a protein or peptide, as many labeling agents as the primary or secondary amines of the analyte can bind to the analyte at the maximum.
- the present invention it is preferable to use two or more kinds of compounds represented by the formula (2) having a constant number of total deuterium contained in R A and R C , preferably two kinds in one set.
- the pair of compounds constituting the set is called the first compound and the second compound, respectively, the first compound and the second compound preferably have the same mass regulator (R B ).
- R B mass regulator
- R A and R C of the first compound contains a greater number of deuterium than the other
- R C of the first compound is R A
- R A and R C of the first compound is CH 3
- CD 3 respectively in the compound pair
- R A and R C of the second compound may be mentioned pair of compounds consisting of CD 3, CH 3 .
- the compound pair is R A and R C of the first compound each C 2 H 5, C 2 D 5 of the case, R A and R C of the second compound consisting of C 2 D 5, C 2 H 5
- the present invention preferably contains deuterium only in one R C of the first compound and the second compound in order to quantify using y S ions.
- each separated labeled with a first compound and a second compound of the labeled second set was analyzed tandem mass, the fragment ions produced through decomposition if the labeling agent to be decomposed so that the separated R A and R C is R A, and The difference in R C is as much as the mass of deuterium and its result is shown in the tandem mass spectrometry.
- the relative intensities of the analytes can be quantified by comparing their relative intensities.
- two different complementary fragment ions generally generated during tandem mass spectrometry may be used as independent quantitative signals.
- analyte means a substance analyzed by the labeling agent according to the present invention.
- the analyte may be a protein, carbohydrate or lipid, and may also be a peptide, nucleic acid or nucleic acid derivative, or steroid.
- Step 2 is a step of ionizing the binder to generate fragment ions, wherein the amide bond present in the binder is broken to generate fragment ions.
- fragment ions that can be produced while breaking the amide bonds of the conjugates of the invention
- fragment ions comprising R A and R B and fragment ions comprising R C and analytes can be produced.
- fragment ions including R A and R B will be referred to as 'b S ions'
- fragment ions containing R C and analyte will be referred to as 'y S ions'. This will be described with reference to FIGS. 15 and 16.
- FIG. 15 is a diagram showing fragment ions generated when a conjugate is decomposed during tandem mass spectrometry.
- MBIT reagent pairs having only deuterium-labeled sites in the same molecular formula are divided into H MBIT and L MBIT by convenience.
- Deuterium-labeled R A or R B is labeled with deuterium in H MBIT and R C. Call it L MBIT.
- the analytes combined with H MBIT and L MBIT have the same overall weight.
- H with deuterium
- L without deuterium
- the conjugate is broken into amide bonds between the two amino acids of the dipeptides during tandem mass spectrometry, including fragments (b S ) and R C containing R A and R B. It can be separated into fragment ions (y S ) containing the analyte. Fragment ions whose only part of Formula 2 is separated from the analyte are named -tag.
- FIG. 16 illustrates tandem mass spectrometry which can be theoretically generated when tandem mass spectrometry of a peptide bound to two or more compounds of formula 2 is not limited in theory.
- FIG. 16 when two or more amine groups, including the N-terminal and C-terminal amino acids of a peptide, are combined, the mass of all b- and y-type sequence ions that can be generated from the peptide Has a mass value less than the mass of -tag.
- y S ions with a higher mass than -tag would appear in the mass range theoretically uninterrupted by other fragment ions derived from the peptide.
- Step 3 is a step of quantifying fragment ions (y S ) including the analyte and R C in the fragment ions, and is a step for analyzing the analytes with fragment ions having a large mass.
- the mass value of the y S quantitative signal is more than 1/3 of the mass value of the ion ion, y S irrespective of the low-mass cutoff, even when tandem mass spectrometry is performed using the resonance-excited collision-derived method in an ion trap mass spectrometer Ions can be detected. Therefore, unlike other conventional homologous markers using quantitative signals having a small mass value, the quadrupole ion trap mass spectrometer has a characteristic that quantitative analysis using y s quantitative signals can be performed.
- the present invention provides a new compound comprising a hydrogen isotope, which can strongly indicate the intensity of the quantitative signal, and capable of simultaneously quantitating two or more proteins, and a composition comprising two or more such compounds, wherein the labeling agent Alternatively, the composition may be used to analyze the amino acid sequence and at the same time provide a method for quantitating the amount of protein.
- the present invention may provide a new method of analyzing the amino acid sequence of a peptide and quantitating the amount simultaneously by utilizing a homologous labeling agent.
- the labeling material is bound to the analyte, and then the tandem mass spectrometry is used to decompose the intermediate binding material and perform quantitative analysis using small mass fragment ions that do not contain the analyte.
- the present invention is a quantitative analysis using a fragment ion (y S ) containing an analyte among fragment ions and having a large mass value after the binding of the labeling material is decomposed in the tandem mass spectrometry using a homopolymer labeling agent
- y S fragment ion
- the present invention is a quantitative analysis using a fragment ion (y S ) containing an analyte among fragment ions and having a large mass value after the binding of the labeling material is decomposed in the tandem mass spectrometry using a homopolymer labeling agent
- y S fragment ion
- Figure 1 shows the structure of a compound according to the invention.
- Figure 1 (a) shows the representative structure of the compound of the present invention and the structure of the quantitative signal generated from the compound.
- 1 (b) to 1 (d) show four structures of a compound according to an embodiment of the present invention.
- Figure 1 (b) is a structure synthesized by multiple isotopes using a hydrogen isotope, wherein each X 1 -X 4 represents a position that is optionally substituted with a hydrogen isotope.
- FIG. 2 shows representative deuterium addition and substitution reactions that can be utilized to prepare the compounds according to the present invention as homopolymer labeling agents using hydrogen isotopes.
- Figure 3 shows the synthesis process of the compound of the present invention. It is synthesized using a haloalkane form reporter unit (R 1 -Br), a carboxylic acid form balance unit (R 2 -COOH), and an esterified amino acid.
- R 1 -Br haloalkane form reporter unit
- R 2 -COOH carboxylic acid form balance unit
- the balance unit is synthesized by modifying the reporter unit.
- the reporter and the balance unit were combined by combining two deuterium introduction methods (reduction of two deuteriums by reducing the carbonyl group of the ester bond with LiAlD 4 and introducing three deuteriums by alkylating alkyne with CD 3 I). Synthesize four kinds each.
- the balance unit is synthesized by modifying the reporter unit.
- FIG. 6 shows the structure of a compound according to an embodiment of the present invention. It is synthesized by using 5-balance- d n and glycine including the reporter- d n, 5-n of the n number of deuterium containing heavy hydrogen, ⁇ m tag means a tag of ⁇ mass of quantitative signal m.
- Figure 7 shows an embodiment of a method of activating a compound according to the present invention, which shows a method of activating a compound with succinimidyl ester and binding to the peptide.
- FIGS. 8 (e) to 8 (g) show the results of using non-kinases (tag ⁇ - ⁇ ).
- Figure 9 shows the relative intensity of the quantitative signal (benzyl cation and iminium cation) generated in the compound of one embodiment of the present invention.
- the intensity of the quantitative signal is expressed as a value relative to the intensity of histidine immonium ion (110 Th) generated from the model peptide.
- FIG. 10 shows the results of tandem mass spectrometry by mixing the model peptides labeled with multiple isomers of one embodiment of the present invention at a predetermined ratio.
- FIG. 10 (a) shows the results of a sample in which a peptide labeled with multiple isomers is mixed in a ratio of 2: 1: 2: 1 (tag ⁇ 129 : ⁇ 131 : ⁇ 132 : ⁇ 134 ), and
- FIG. 10 (b) Shows the results of a sample mixed at a ratio of 1: 2: 1: 2 (tag ⁇ 129 : ⁇ 131 : ⁇ 132 : ⁇ 134 ).
- Fig. 11 shows the results of measuring the amount or concentration range of peptides that can be measured using multiple isomers (tag ⁇ 129 - ⁇ 134 ).
- Tandem mass spectrometry of FGER, VASLR, and SEIAHR in tryptic BSA (bovine serum albumin) labeled with multiple isomers showed peptides tagged tag ⁇ 129 and tag ⁇ 131 at a 3: 1 ratio.
- the intensity of the mother ions observed at each concentration is shown in Figure 11 (a), and the ratio of the quantitative signal measured by tandem mass spectrometry is shown in Figure 11 (b).
- Figure 12 shows the results of quantitative analysis of tryptic BSA labeled with multiple isomers in conjunction with liquid chromatography (LC) and MALDI mass spectrometer.
- 12 (a) shows the intensity of the mother ions observed with the MALDI mass spectrometer according to the time each peptide was eluted from the LC
- Figure 12 (b) shows the amount of quantitative signal measured in each peptide tag ⁇ 129 This is compared with the quantity of quantitative signal of. Results from six peptides (FGER, VASLR, QEPER, AWSVAR, SEIAHR and YLYEIAR) in tryptic BSA labeled with isomers.
- Fig. 13 schematically shows the chemical structure of the labeling agent of the present invention.
- Figure 14 schematically shows the reaction of the labeling agent of the present invention to peptides and proteins.
- Figure 15 schematically shows the type of fragment ions that can be produced when the labeling agent bound to the amine of the analyte is decomposed during tandem mass spectrometry.
- FIG. 16 shows tandem mass spectrometry that can be theoretically generated when tandem mass spectrometry of a peptide bound to two or more labeling agents.
- FIG. 17 shows the results of electrospray (ESI) mass spectrometry after combining two model peptides with a labeling agent according to one embodiment of the present invention.
- FIG. 18 shows a quadrupole ion trap of ions having a +2 charge (MH 2 2+ ) in a mother ion having a labeling agent bound to a peptide LISFYAGR having one amine at the N-terminus, according to an embodiment of the present invention. It shows the tandem mass spectrometry spectra obtained by selecting resonance within the resonance-excited collision-derived decomposition.
- FIG. 19 shows a positive ion (MH + ) in a quadrupole ion trap of a mother ion having a labeling agent bound to a peptide LISFYAGR having one amine at the N-terminus, according to an embodiment of the present invention.
- Resonance excitation shows the tandem mass spectrometry obtained by collision-derived decomposition.
- FIG. 20 shows an ion having a +2 charge in a mother ion in which a labeling agent according to an embodiment of the present invention is bound to a peptide LISFYAGK having a total of two amines, one each at the N-terminus and lysine side chains (MH 2). 2+) a shows a tandem mass spectrum is obtained by decomposing the quadrupole ion trap to selected within 0 people this collision results.
- FIG. 21 is a ions (MH +) having a +1 charge in a mother ion in which a labeling agent according to an embodiment of the present invention is bound to a peptide LISFYAGK having a total of two amines, one each at the N-terminus and lysine side chains. ) Shows the tandem mass spectrometry obtained by resonating the excitation-induced resonance with a quadrupole ion trap.
- FIG. 22 shows a mother ion (MH 2 2+ having a charge of +2 of model peptides LISFYAGR (FIG. 10 (a)) and LISFYAGK (FIG. 10 (b)) labeled with a labeling agent according to an embodiment of the present invention.
- LISFYAGR FIG. 10 (a)
- LISFYAGK FIG. 10 (b)
- FIG. 23 shows a mother ion (MH + ) having a +1 charge of the model peptides LISFYAG (FIG. 11 (a)) and LISFYAGK (FIG. 11 (b)) labeled with a labeling agent according to an embodiment of the present invention.
- the intensity of y s quantitative signal in the quadrupole ion trap is determined by the total sum of the signal strengths of all fragment ions.
- FIG. 11 (c) shows a mother ion having a +1 charge of the model peptide LISFYAGR labeled with a labeling agent according to an embodiment of the present invention produced by MALDI ionization and tandem mass spectrometry in a TOF / TOF apparatus.
- S b is a view showing the intensity ratio of the quantified signal.
- FIG. 24 (a) shows an ion having a +2 charge (MH 2 2+ ) in a mother ion in which Val-tag is bound to peptide LISFYAGK having a total of two amines, one each at the N-terminus and lysine side chains. Is selected from the quadrupole ion trap to show the resonance excitation collision-derived MS 2 tandem mass spectrometry generated, Figure 24 (b) shows the L y S ions generated in the MS 2 tandem mass spectrometry again in the ion trap It shows the MS 3 tandem mass spectrometry obtained by collision-derived decomposition by selecting from.
- Figures 26 (a) and 26 (b) show H MBIT (Fig. 26 (a)) or L MBIT of Ethyl-tag in peptide YGGFLK having a total of two amines, one each at the N-terminus and lysine side chains.
- Figure 26 (b)) shows the MS 2 tandem mass spectrometry generated by the resonance-excited collision-decomposed by selecting the ions (MH + ) having a +1 charge in the bound ion ion in the quadrupole ion trap
- 26 (c) and 26 (d) are enlarged views of the range in which y S signal ion occurs in FIGS. 26 (a) and 26 (b).
- FIG. 27 is a resonance of a quadrupole ion trap by selecting an ion having a +1 charge in a mother ion in which Ethyl-tag is bound to a peptide LISFYAGK having a total of two amines, one at the N-terminus and one at a lysine side chain.
- the MS 2 tandem mass spectrometry generated by collision-derived decomposition is shown, showing the tandem mass spectrometry by mixing a 2: 1 ratio of a peptide bound to L MBIT of Ethyl-tag and a peptide bound to H MBIT.
- FIG. 1 (a) Various structures or functional groups can be introduced at the R 1 , R 2 , and R 3 positions in the compound (labelling agent) represented by FIG. 1 (a).
- the compound labeled by FIG. 1 (a).
- Figure 1 (b) to Figure 1 (e) as an example, to synthesize a compound having four structures (tag ⁇ - ⁇ ) and confirm how the quantitative signal appears according to each structure or functional group It was.
- Figure 1 (b) of the four structures is an example synthesized with a homologous labeling agent that can quantify multiple proteins using hydrogen isotopes.
- X 1 to X 4 in FIG. 1 (b) show positions of substituted deuterium.
- Tag ⁇ and ⁇ for commercially available reporter unit and balance unit among non-equivalent labeling agents include reporter unit of ⁇ , 3-iodopropyl benzene; reporter unit of ⁇ , 1-iodooctane; ⁇ The balance unit, 5-phenylpentanoic acid; and ⁇ balance unit, octanoic acid) were purchased, and the labeling agent was synthesized.
- tag ⁇ the reporter unit constituting the labeling agent (1- (iodomethyl) -4-propylbenzene) and the balance unit (2- (4-propylphenyl) acetic acid) were synthesized according to the procedure of FIG. 5, and tag ⁇ was synthesized using them.
- Step 1 Synthesis of 4-((trimethylsilyl) ethynyl) benzoic acid methyl ester
- Step 2 Synthesis of (4-((trimethylsilyl) ethynyl) phenyl) methanol
- Step 3 tert Synthesis of -butyldimethyl ((4-((trimethylsilyl) ethynyl) benzyl) oxy) silane
- Step 4 tert Synthesis of -butyl ((4-ethynylbenzyl) oxy) dimethylsilane
- Step 5 tert Synthesis of -butyldimethyl ((4- (prop-1-yn-1-yl) benzyl) oxy) silane
- Step 6 tert Synthesis of -butyldimethyl ((4-propylbenzyl) oxy) silane
- n-butylammonium fluoride (TBAF; 1.56 mL, 1.0 M tetrahydrofuran Solution, 1.56 mmol) was added slowly and stirred at 0 ° C. for 30 minutes.
- TBAF n-butylammonium fluoride
- 5 mL of saturated aqueous ammonium chloride solution was added to terminate the reaction, and extracted with ethyl acetate (4 times in total of 5 mL).
- the resulting organic layer was treated with anhydrous magnesium sulfate to remove water.
- the precipitate was filtered off and the resulting solution was concentrated by distillation under reduced pressure and purified by column chromatography to give 198 mg (0.838 mmol, 95%) of the title compound.
- Step 8 Synthesis of 1- (iodomethyl) -4-propylbenzene
- the resulting solution was distilled under reduced pressure, concentrated and dissolved in 6 mL of acetone, followed by addition of sodium iodide (NaI; 150 mg, 0.999 mmol). After stirring for 15 minutes at room temperature, the solvent is dried by distillation under reduced pressure when the reaction is complete. 10 mL of water was added thereto, followed by extraction with ethyl acetate (3 times for 5 mL each), and the resulting organic layer was treated with anhydrous magnesium sulfate to remove water. The precipitate was filtered off and the resulting solution was concentrated by distillation under reduced pressure and purified by column chromatography to obtain 157 mg (0.604 mmol, 90%) of the title compound (tag ⁇ reporter unit).
- NaI sodium iodide
- Step 12 Synthesis of Methyl 2- (N- (4-propylbenzyl) -2- (4-propylphenyl) acetamido) acetate
- Step 13 Synthesis of 2- (N- (4-propylbenzyl) -2- (4-propylphenyl) acetamido) acetic acid
- tag ⁇ was synthesized in the same manner as in FIG. 3, and specific synthetic methods and NMR results of the compound synthesized in each step are shown in Steps 1 to 3 below.
- Step 1 Synthesis of Methyl 2-((3-phenylpropyl) amino) acetate
- Step 2 Synthesis of Methyl 2- (5-phenyl-N- (3-phenylpropyl) pentaneamido) acetate
- Step 3 Synthesis of 2- (5-phenyl-N- (3-phenylpropyl) pentamido) acetic acid
- tag ⁇ was synthesized in the same manner as in FIG. 3, and specific synthetic methods and NMR results of the compound synthesized in each step are shown in Steps 1 to 3 below.
- Step 3 Synthesis of 2- (N-octyloctaneamido) acetic acid
- Methyl 2- (N-octyloctaamido) acetate (44.7 mg, 0.136 mmol) was dissolved in 0.5 mL of methanol, and then 100 ⁇ L of 20% sodium hydroxide aqueous solution was added thereto, and the mixture was stirred at room temperature for 2 hours. Upon completion of the reaction, 3 mL of ethyl acetate was added to dilute and 200 ⁇ L of 10% aqueous hydrogen chloride solution was added to neutralize the solution. Water was removed with anhydrous magnesium sulfate, and the precipitate was filtered off. The resulting solution was concentrated by distillation under reduced pressure and purified by column chromatography to obtain 36.5 mg (0.116 mmol, 86%) of the title compound.
- Steps 1 to 7 the process of synthesizing reporter- d 5 and reporter- d 0 and the NMR results of the compounds produced in each step are shown in Steps 1 to 7 below.
- Step 1 Synthesis of 4-((trimethylsilyl) ethynyl) benzoic acid methyl ester
- the resulting organic layer was treated with anhydrous magnesium sulfate to remove water, and the precipitate was filtered. Came out.
- the resulting solution was distilled under reduced pressure, concentrated and dissolved in 12 mL of acetone, followed by addition of sodium iodide (NaI; 280 mg, 1.87 mmol). After stirring for 1 hour at room temperature, the solvent is dried by distillation under reduced pressure when the reaction is complete. 10 mL of water was added thereto, followed by extraction with ethyl acetate (3 times for 10 mL each), and the resultant was treated with anhydrous magnesium sulfate to remove water. The precipitate was filtered off and the resulting solution was concentrated by distillation under reduced pressure and purified by column chromatography to obtain 279 mg (1.09 mmol, 88%) of the title compound (reporter- d 0 ).
- diethyl 2- (4- (prop-1-yn-1-yl) benzyl) malonate- d 5 (88.5 mg, 0.302 mmol) was dissolved in 2 mL dry DMF, followed by sodium chloride (35.3 mg, 0.604 mmol) and 100 ⁇ L of water were added and stirred under reflux conditions for 2 days.
- sodium chloride 35.3 mg, 0.604 mmol
- 3 mL of water was added to terminate the reaction, extracted with diethyl ether (3 mL 4), and the resultant organic layer was treated with anhydrous magnesium sulfate to remove water.
- the precipitate was filtered off and the resulting solution was concentrated by distillation under reduced pressure and purified by column chromatography to give 50.0 mg (0.226 mmol, 75%) of the title compound.
- diethyl 2- (4- (prop-1-yn-1-yl) benzyl) malonate- d 0 (94.8 mg, 0.329 mmol) was dissolved in 2 mL dry DMF, followed by sodium chloride (38.5 mg, 0.658 mmol) and 200 ⁇ L of water were added and stirred for 2 days under reflux conditions.
- sodium chloride 38.5 mg, 0.658 mmol
- 200 ⁇ L of water were added and stirred for 2 days under reflux conditions.
- 3 mL of water was added to terminate the reaction, followed by extraction with diethyl ether (4 times in 3 mL each), and the resultant organic layer was treated with anhydrous magnesium sulfate to remove water.
- the precipitate was filtered off and the resulting solution was concentrated by distillation under reduced pressure and purified by column chromatography to give 50.0 mg (0.231 mmol, 70%) of the title compound.
- the method of synthesizing the homo and multiple isomeric labeling agents and the NMR results of the compounds synthesized in each step are shown in the following steps 11 to 13. Since the method of synthesizing multiple isomers is the same, the case of the isomer labeling agent tag ⁇ 129 is described in detail, and for the other isomer labeling agents, the difference in the synthesis process is described.
- homopolymer labeling agents tag ⁇ 131 , tag ⁇ 132 and tag ⁇ 134 were prepared as follows.
- the binding reaction of the compound of Example 1-2 with the peptide is shown in FIG. 7.
- the compound of Example 1-2, EDC, and N-hydroxysuccinimide (NHS) were dissolved in DMF, mixed to reach 60, 35, and 40 mM, respectively, and reacted at room temperature for 45 minutes to form a carboxylic acid terminal group of the labeling agent.
- Peptide tryptic BSA or angiotensin II (DRVYIHPF) obtained by digesting bovine serum albumin with trypsin enzyme was dissolved in aqueous sodium bicarbonate solution (NaHCO 3 , 100 mM), and then activated labeling agent was reacted for at least 6 hours. Proceeded. Since the labeling reaction occurring in the hydroxyl group forms an ester bond to form an unstable bond and the efficiency of the reaction is low, the hydroxyl amine (80 mM) dissolved in an aqueous sodium bicarbonate solution (100 mM) is used for accurate quantification. Side reactions labeled with hydroxyl groups of the peptide were removed. The whole reaction was terminated by addition of trifluoroacetic acid (TFA).
- TFA trifluoroacetic acid
- Labeled angiotensin II was diluted with 50 TA solution (0.1% TFA / 50% acetonitrile / 50% H 2 O) followed by HCCA matrix solution (a-cyano-4-hydroxycinnamic acid, 5 mg / mL 50 TA) and 1 The mixture was mixed with 1: 1, dried on a MALDI plate, and analyzed using a tandem time-of-flight mass spectrometer (time-of-flight / time-of-flight (TOF / TOF) mass spectrometry). Tandem mass spectrometry confirmed that the quantitative and labeling signals were observed as well as the intensity.
- TOF / TOF tandem time-of-flight mass spectrometer
- the labeled tryptic BSA was used to confirm the concentration or amount of analytical sample that could be measured with the homopolymer labeling agent and to verify that multiple samples could be simultaneously quantified in conjunction with liquid chromatography (LC).
- LC liquid chromatography
- the samples labeled with tag ⁇ 129 and tag ⁇ 131 among the multiple isomers were mixed at a ratio of 3: 1, and then diluted with 50TA. Samples of each concentration were mixed in a 1: 1 ratio of HCCA matrix solution and loaded onto a MALDI plate. The amount of peptide loaded at this time is about 4200, 1300, 420, 130, 42, and 13 femtomol per spot.
- tryptic BSAs labeled with four different isomers were mixed at a ratio of 2: 1: 4: 8 and separated by nanoLC, and the peptide eluted from the LC was mixed with HCCA matrix solution in a MALDI plate. Loaded on and analyzed by MALDI-TOF / TOF.
- Mass spectrometry of the model peptides associated with each labeling agent revealed that the mass values bound to one labeling agent (1406.7 for tag ⁇ 129 - ⁇ 134 , 1406.7 for tag ⁇ , 1395.7 for tag ⁇ , 1381.7 for tag ⁇ , and tag ⁇ was observed at 1341.8 Th).
- tandem mass spectrometry was performed by selecting ions observed in the mass spectrum, and the results are shown in FIG. 8.
- FIGS. 8 (e) to 8 (g) are tags ⁇ and tag which are non-homologs, respectively.
- the result is a peptide labeled with ⁇ and tag ⁇ .
- the ions generated in each labeling agent, namely the labeling signal and the quantitative signal, were observed at the designed mass values.
- the labeling signal was observed at tag ⁇ 129 - ⁇ 134 at 361, tag ⁇ at 350, tag ⁇ at 336, and tag ⁇ at 296 Th.
- Amount signal ⁇ tag 129 is 129, tag 131 is ⁇ 131, ⁇ 132 is tag 132, tag 134 is 134 ⁇ , ⁇ is a tag 133, tag 148 is ⁇ , and ⁇ tag has been observed in the 142 Th.
- the intensity of the quantitative signal generated in each labeling agent is shown in FIG. 9 in comparison with the most strongly observed histidine immonium ion (110 Th) among the fragment ions of the model peptide.
- Different types of quantitative signals were observed depending on the structure of the labeling agent.
- the beta benzyl derivatives of tag ⁇ and tag ⁇ were quantitative signals of benzyl cation structures
- the beta beta derivatives of tag ⁇ and tag ⁇ were non-benzyl derivatives.
- the type of quantitative signal varies depending on the labeling agent, the quantitative signals of each labeling agent were observed more strongly than the fragment ions of the model peptide.
- fragment ions of the model peptide fragment ions including the C-terminal group of the peptide, ie y 2 , y 3 , and y 7, were observed at the same position regardless of the labeling agent, and the N-terminal group of the peptide was observed.
- Including fragment ions, that is, b 2 , b 3 -NH 3 , a 5 , and b 7 + H 2 O and the like were observed where the mass increased by ⁇ molecular weight of each labeling agent-H 2 O ⁇ . From the mass spectrometry and tandem mass spectrometry, it was confirmed that each labeling agent was synthesized as designed by observing the molecular weight, quantification, and labeling signal of each synthesized labeling agent as expected. It was confirmed that only labeled.
- Figure 10 shows the results obtained by mixing model peptides labeled with multiple isomers in a proportion and tandem mass spectrometry.
- the quantitative signals of each of the multiple isomeric labeling agents are represented by an inverted triangle.
- FIGS. 8 (a) to 8 (d) which analyze each of the multiple isomers separately, the intensity of each quantitative signal was relatively weak and the fragment ions of the peptide were observed more strongly in the multiple quantitative analysis.
- the ions other than the quantum signal have the same mass value so that their strength is enhanced. For this reason, like the labeling agents developed in the present invention, the stronger the quantitative signal is observed, the better the multiple quantitative analysis.
- the amount or concentration range of peptide that can be measured using multiple isomers is shown in FIG. 11.
- the experiments were carried out using peptides FGER, VASLR, and SEIAHR, which were relatively strongly observed in tryptic BSA labeled with isomers.
- Peptides labeled with Tag ⁇ 129 and tag ⁇ 131 were mixed at a 3: 1 ratio and tandem mass spectrometry was performed with varying amounts of protein from 4.2 picomolar to 13 femtomol.
- the MALDI mass spectrometer is limited in the amount of ionization by the laser, so that when the amount of the sample is small, the intensity of the mother ion is small compared to the amount of the loaded sample, but it is irrelevant to quantitative analysis through tandem mass spectrometry. It was.
- the homologous labeling agent of the present invention had a strong quantitative signal, and was able to quantitate even a small amount of 13 peptomomol.
- FIG. 12 shows the results of quantitative analysis in conjunction with LC and MALDI mass spectrometer.
- 12 (a) shows the intensity of the mother ions eluted from the LC
- Figure 12 (b) shows the amount of the quantitative signal measured at each spot compared with the quantitative signal of tag ⁇ 129 .
- a total of six peptides FGER, VASLR, QEPER, AWSVAR, SEIAHR, and YLYEIAR
- FGER fluorylity
- the same peptide was measured at the same ratio of quantitative signals while eluting with LC. This means that the multilabeled peptides of the homopolymer of the present invention are simultaneously moved on the nanoLC, and thus accurate quantification is achieved only with the eluate at a specific time. In addition, as observed through the model peptide, it was confirmed that the proportion of the quantitative signal observed was not affected by the total amount of the sample.
- the labeling agent of Chemical Formula 2 of the present invention was prepared with reference to Korean Patent Publication No. 10-2010-0009466, Korean Patent Publication No. 10-2010-0009479 and International Patent Publication No. WO 10/008159.
- isotope coders R A and R C are methyl (CH 3 or CD 3 ) and mass regulators R B are valine, glutamine (Gln), histidine (His), phenylalanine (Phe), and arginine (Arg).
- Labeling agents which are side chains of
- those with side chains of valine (Val), glutamine (Gln), histidine (His), phenylalanine (Phe), and arginine (Arg) can be used as Val-tag, Gln-tag, His-tag, Phe-tag, And Arg-tag.
- a labeling agent was prepared in which the isotopic coding groups R A and R C were ethyl (C 2 H 5 or C 2 D 5 ) and the mass regulator R B was methyl. This is named Ethyl-tag for convenience.
- Example 2-1 The labeling agent prepared in Example 2-1 was combined with Val-, Gln-, His-, Phe-, Arg-tag and Ethyl-tag to three model peptides LISFYAGR or LISFYAGK or YGGFL.
- two protein mixture samples were prepared in which bovine serum albumin, myoglobin, and ubiquitin protein were mixed in different amounts.
- Mixed Sample A was prepared with bovine serum protein, myoglobin, and ubicutin at concentrations of 4 mg / mL, 2 mg / mL, and 0.2 mg / mL, respectively.
- Mixed Sample B contained bovine serum protein, myoglobin, and ubicutin.
- the model peptide bound with the labeling agent was desalted with ZipTip-C 18 (Millipore) and finally dissolved in a solution in which 0.5% formic acid was added and acetonitrile and water were mixed at a volume ratio of 1: 1 at each 5 M concentration. It was prepared as it is.
- Mixed samples A and B combined with the labeling agent were mixed in a volume ratio of 1: 1, and then completely dissolved in a vacuum, and then dissolved in an aqueous solution containing 0.5% formic acid.
- the mass spectrometer used in the quantitative analysis of the conjugate of the model peptide and MBIT described in Example 2-2 was used as Espquire HCT from Bruker or LTQ Velos from Thermo as an electrospray ionization quadrupole ion trap.
- 100 L of sample solution was loaded into the syringe pump and then transferred to the electrospray tip at a flow rate of 1 ⁇ L / min.
- Electrospray was at a voltage of 4 kV. Sample ions were collected and mass analyzed for up to 200 ms inside the ion trap for one spectral measurement per cycle, and up to 250 cycles were repeated for 1 minute.
- the mass spectrometer used in the quantitative analysis of the combination of the mixed samples A, B and MBIT described in Example 2-2 uses the LTQ XL of Thermo Co., Ltd. as an electrospray ionization quadrupole ion trap connected to the liquid phase chromatography. It was. The sample solution was electrosprayed ionized through liquid phase chromatography at a flow rate of 0.3 ⁇ L / min. At this time, the electrospray was performed at a voltage of 2 kV. The mass spectrometry and tandem mass spectrometry spectra of the peptides were obtained every 0.2 seconds eluted by liquid phase chromatography.
- FIG. 17 shows the quadrupoles by binding Val-, Gln-, His-, Phe-, and Arg-tag to the model peptides LISFYAGR (FIG. 17 (a)) and LISFYAGK (FIG. 17 (b)), followed by electrospray ionization. Mass spectrometry obtained using an ion trap mass spectrometer is shown. Peptide ions with a charge of +1 and +2, respectively, were detected.
- the original mass of the LISFYAGR peptide is 925.5 Da, which is detected at 926.5 Th and 463.8 Th in +1 and +2 ions (MH + , MH 2 2+ ), which are detected by attaching one or two protons, respectively.
- the labeling agent was bound to this peptide, the peptide was detected at an increased mass corresponding to the mass of one labeling substance.
- +1 valent ions are detected at m / z 1141.6, 1170.6, 1179.6, 1189.6, and 1198.6 Th, respectively.
- m / z at 571.3, 585.8, 590.3, 595.3, and 599.9 Th.
- the original mass of the LISFYAGK peptide was 897.5 Da, with +1 and +2 ions (MH + , MH 2 2+ ) detected with one or two protons detected at 898.5 Th and 449.8 Th, respectively.
- a labeling agent is bound to the peptide, the peptide is detected at an increased mass corresponding to the mass of each of two labeling substances.
- the Val-, Gln-, His-, Phe-, and Arg-tags are combined, the +1 valent ions are detected at m / z 1328.9, 1386.9, 1404.9, 1424.9, and 1442.9 Th, respectively.
- m / z at 654.9, 693.9, 703.0, 712.9, and 721.9 Th.
- Tandem mass spectrometry was performed when LI-SFYAGR and LISFYAGK were combined with Val-, Gln-, His-, Phe-, and Arg-tag, respectively.
- the peptide labeled with L MBIT and the peptide labeled with H MBIT were analyzed. The experiment was carried out by mixing at a ratio of 1: 1. The results are shown in FIGS. 18 to 21.
- Fig. 18 is a tandem mass spectrometry obtained by resonance-excited collision-induced decomposition of ions having a +2 charge in a quadrupole ion trap of a mother ion having a labeling agent bound to peptide LISFYAGR having one amine at the N-terminus in a quadrupole ion trap. to be. Since only the N-terminus of the peptide is associated with the labeling agent, all y-type fragment ions are detected at a constant mass-to-charge ratio (m / z) regardless of the type of labeling agent. On the other hand, b-type fragment ions are detected by increasing the mass-to-charge ratio (m / z) depending on the type of lasing agent.
- L y S and H y S ions that can be used as quantitative signals are detected at m / z 987 Th and 1000 Th, respectively, with +1 being charged.
- y S ions are strongly detected.
- Val-, Gln-, and Phe-tag although the signal strength is weak, it can be seen that y s quantitative signal ions are detected.
- Figure 19 is a tandem mass spectrometry obtained by resonance-excited collision-induced decomposition of ions carrying a +1 charge in a quadrupole ion trap of a mother ion with a labeling agent bound to the peptide LISFYAGR having one amine at the N-terminus Indicates.
- quantitative signal ions are detected, but are measured at very small signal strengths, and thus are not suitable for use in quantitative analysis.
- FIG. 20 shows resonance excitation of a quadrupole ion trap in a quadrupole ion trap of ions having a labeling agent bound to a peptide LISFYAGK having a total of two amines, one each at the N-terminus and lysine side chains. Tandem mass spectrometry obtained by decomposing the derivative is shown. As shown in FIG. 8, since the labeling agent is bound to the N-terminal amine and the C-terminal lysine, respectively, the b-type and y-type fragment ions increase by a certain mass-to-charge ratio according to the type of labeling agent. Also detected can be confirmed.
- the y S ion having a +1 charge is measured at a mass-to-charge ratio greater than -tag, and is detected in a region that is not disturbed by other sequence ions.
- the signal strength is as strong as the other sequence ions, and the intensity ratio of [ L y S ]: [ H y S ] ions well suited to the mixing ratio of 1: 1.
- FIG. 21 shows resonance excitation by selecting a positive ion in a quadrupole ion trap of a mother ion in which a labeling agent is bound to a peptide LISFYAGK having a total of two amines, one each at the N-terminus and lysine side chains. Tandem mass spectrometry obtained by decomposing the derivative is shown. As in the case of +2 experiments with mother ions, it can be seen that both b-type and y-type fragment ions are detected by a certain mass-to-charge ratio depending on the type of labeling agent. However, in particular, it can be seen that the +1 valence ions selected from the experimental results show that the positive S ions of +1 valence are very strong. In addition, it can be seen that the signal intensity ratio of [ L y S ]: [ H y S ] ions is also detected almost identical to the 1: 1 mixing ratio.
- FIG. 22 and 23 are graphs showing the ratio of the intensity of y s quantitative signal which appears when tandem mass spectrometry of a model peptide labeled with a labeling agent is included in the total sum of the signal strengths of all fragment ions.
- FIG. 10 shows the result of selecting and decomposing a mother ion having a +2 charge after being labeled with a labeling agent and electrospray ionization. Compared to the case of LISFYAGR combined with one labeling agent, it was confirmed that the intensity of quantitative signal ion y S is more than twice stronger than that of LISFYAGK with two labeling agents coupled to the N-terminus and the C-terminus.
- FIG. 23 (a) and 23 (b) show the results of decomposition by selecting LISFYAGR and LISFYAGK, each of which is labeled with a labeling agent and electrospray ionized to have a +1 charge.
- FIG. 23 (c) shows the ratio of the b s quantitative signal ion when the LISFYAGR +1 labeled with a labeling agent is detected in the MALDI-TOF / TOF equipment Shown. LISFYAGK combined with two labeling agents was not detected through the MALDI ionization method.
- Fig. 24 shows resonance by selecting in the quadrupole ion trap an ion with a +2 charge among the mother ions in which the labeling agent is bound to the peptide LISFYAGK, which has a total of two amines, one each at the N-terminus and lysine side chains.
- the MS 3 tandem mass spectrometry obtained by collision-derived decomposition by selecting the +1 valent y S ions generated by collision-derived decomposition in an ion trap again.
- the quantitative analysis using y S is not limited in theory, but includes lysine, which is the best performance when using a peptide capable of binding two or more labeling agents as an analyte. It can be judged that.
- the presence of lysine at the C-terminus of the peptide has the great advantage that the +1 valent y S ion can be detected without interfering with other fragment ions.
- FIG. 25 is a diagram illustrating a standard quantitative analysis curve obtained by performing quantitative analysis on the intensity of L y S and H y S ions generated by tandem mass spectrometry of model peptides mixed at various ratios labeled with H MBIT and L MBIT .
- the labeling agent used in the implementation was Gln-tag, and LISFYAGK was used as the model peptide. Results were obtained for peptide ions with +1 and +2 being charged, respectively.
- the concentration of the peptide solution labeled with the labeling agent was maintained at about 5 ⁇ M regardless of the mixing ratio. As shown in FIG. 25, it was found that the quantitative analysis using y S ions showing strong signal strength showed a measurement ratio very well matched with the actual mixing ratio.
- the mass difference of quantitative signal ions is 3 Da, and it is possible that H y S quantitative signal ions are interfered by the natural isotope pattern of L y S quantitative signal ions. have.
- This problem can be overcome by using an ethyl group as the isotope coders R A and R C as the mass difference between quantitative signal ions becomes 5 Da. Tandem mass spectrometry was performed by binding Ethyl-tag to the model peptide.
- FIGS. 26 and 27 The results of tandem mass spectrometry combined with Ethyl-tag in YGGFLK are shown in FIGS. 26 and 27. Tandem mass spectrometry of the Ethyl-tag bound to LISFYAGK is shown in FIG. 28.
- FIG. 26 shows resonance by selecting a ion having a +1 charge in a quadrupole ion trap of a mother ion in which Ethyl-tag is bound to peptide YGGFLK having a total of two amines, one in the side chain of lysine at the N-terminus. Tandem mass spectrometry obtained by collision-derived decomposition is shown. 26 (a) and 26 (b) are the results of combining H MBIT and L MBIT in Ethyl-tag, respectively.
- FIG. 27 shows the results of tandem mass spectrometry in which the L MBIT of Ethyl-tag and the H MBIT are bound to a peptide having a LISFYAGK sequence in a ratio of 2: 1.
- two protein mixed samples (mixed samples A and B), in which three kinds of proteins are mixed at different ratios, were prepared and analyzed using Gln-tag. It was.
- the bovine serum protein, myoglobin, and ubicutin of mixed sample A were prepared to be 2, 4, and 0.5 times the quantity respectively compared to the bovine serum protein, myoglobin, and ubicutin of mixed sample B. This was enzymatically digested with trypsin and labeled with L MBIT and H MBIT of Gln-tag and quantitatively analyzed by liquid phase chromatography and tandem mass spectrometry.
- FIG. 28 (a) shows the ratio of [ H y S ]: [ L y S ] measured with respect to the liquid phase chromatography elution time of the detected peptide
- FIG. 28 (b) shows the mass versus charge of the detected peptide.
- the figure shows the ratio [ H y S ]: [ L y S ] measured for Harvey.
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Abstract
Description
Claims (27)
- 제2항에 있어서,R1은 옥틸이고; 및R2는 헵틸인 것을 특징으로 하는 화합물.
- 제1항에 있어서,R1 및 R2는 각각 CH3―C≡C―C6H4―CH2 및 CD3―C≡C―C6H4―CD2―CH2이거나;각각 CH3―C≡C―C6H4―CD2 및 CD3―C≡C―C6H4―CH2―CH2이거나;각각 CD3―C≡C―C6H4―CH2 및 CH3―C≡C―C6H4―CD2―CH2이거나; 또는각각 CD3―C≡C―C6H4―CD2 및 CH3―C≡C―C6H4―CH2―CH2인 것을 특징으로 하는 화합물.
- 제1항에 있어서,R3는 글리신, 알라닌, 세린, 발린, 류신, 이소류신, 메티오닌, 글루타민, 아스파라진, 시스테인, 히스티딘, 페닐알라닌, 아르기닌, 티로신 및 트립토판으로 구성되는 어느 하나의 아미노산 잔기의 측쇄인 것을 특징으로 하는 화합물.
- 제1항에 있어서,R4는 하이드록시, 숙신이미드-N-옥시, 3-설포숙신이미드-N-옥시, 벤조트리아졸-1-일옥시, 펜타할로벤질옥시, 4-니트로페녹시 또는 2-니트로페녹시인 것을 특징으로 하는 화합물.
- 제1항에 있어서, 상기 화합물은1) 2-(N-(4-(프로프-1-이닐)벤질)-3-(4-(프로프-1-이닐)페닐)프로판아미도)아세트 산;2) 2-(N-(4-(프로프-1-이닐)벤질)-3-(4-(프로프-1-이닐-3,3,3-d 3 )페닐)프로판아미도-3,3-d 2 )아세트 산;3) 2-(N-(4-(프로프-1-이닐)벤질-1,1-d 2 )-3-(4-(프로프-1-이닐-3,3,3-d 3 )페닐)프로판아미도)아세트 산;4) 2-(N-(4-(프로프-1-이닐-3,3,3-d 3 )벤질)-3-(4-(프로프-1-이닐)페닐)프로판아미도-3,3-d 2 )아세트 산;5) 2-(N-(4-(프로프-1-이닐-3,3,3-d 3 )벤질-1,1-d 2 )-3-(4-(프로프-1-이닐)페닐)프로판아미도)아세트 산;6) 2-(N-(4-프로필벤질)-2-(4-프로필페닐)아세트아미도)아세트 산;7) 2-(5-페닐-N-(3-페닐프로필)펜탄아미도)아세트 산; 및8) 2-(N-옥틸옥탄아미도)아세트 산으로 구성되는 군으로부터 선택되는 어느 하나의 화합물인 것을 특징으로 하는 화합물.
- 제1항 내지 제8항 중 어느 한 항의 화합물을 두 종류 이상 포함하는 조성물.
- 제9항에 있어서, 상기 두 종류 이상의 화합물은 서로 중수소의 수가 동일한 것을 특징으로 하는 조성물.
- 제9항에 있어서, 상기 조성물은1) 2-(N-(4-(프로프-1-이닐)벤질)-3-(4-(프로프-1-이닐-3,3,3-d 3 )페닐)프로판아미도-3,3-d2)아세트 산;2) 2-(N-(4-(프로프-1-이닐)벤질-1,1-d 2 )-3-(4-(프로프-1-이닐-3,3,3-d 3 )페닐)프로판아미도)아세트 산;3) 2-(N-(4-(프로프-1-이닐-3,3,3-d 3 )벤질)-3-(4-(프로프-1-이닐)페닐)프로판아미도-3,3-d 2 )아세트 산; 및4) 2-(N-(4-(프로프-1-이닐-3,3,3-d 3 )벤질-1,1-d 2 )-3-(4-(프로프-1-이닐)페닐)프로판아미도)아세트 산로 구성되는 군으로부터 선택되는 어느 하나 이상의 화합물을 포함하는 것을 특징으로 하는 조성물.
- 제12항에 있어서, 상기 RA 및 RC는 각각 메틸이고, RA 및 RC 중 적어도 하나는 하나 이상의 중수소를 포함하는 것을 특징으로 하는 정량방법.
- 제12항에 있어서, 상기 RA 및 RC는 각각 에틸이고, RA 및 RC 중 적어도 하나는 하나 이상의 중수소를 포함하는 것을 특징으로 하는 정량방법.
- 제13항에 있어서, 상기 RA 및 RC는, 각각 CH3 및 CD3이거나, 또는 각각 CD3 및 CH3인 것을 특징으로 하는 정량방법.
- 제14항에 있어서, 상기 RA 및 RC는, 각각 C2H5 및 C2D5이거나, 또는 각각 C2D5 및 C2H5인 것을 특징으로 하는 정량방법.
- 제12항에 있어서, 상기 RB는 천연 또는 인공 아미노산 잔기의 측쇄인 것을 특징으로 하는 정량방법.
- 제12항에 있어서, 상기 RB는 직쇄 또는 가지쇄의 C1-18 알킬인 것을 특징으로 하는 정량방법.
- 제12항에 있어서, 상기 Linker는 N-하이드록시숙신이미딜기, N-하이드록시설포숙신이미딜기, 벤조트리아졸-1-일옥실기, 펜타할로벤질기, 4-니트로페닐기 및 2-니트로페닐기로 구성되는 군으로부터 선택되는 어느 하나인 것을 특징으로 하는 정량방법.
- 제12항에 있어서, 상기 라벨링제는 상기 화학식 1로 표시되는 화합물을 두 종류 이상 포함하는 것을 특징으로 하는 정량방법.
- 제20항에 있어서, 상기 두 종류 이상의 화합물 각각의 RA 및 RC에 포함된 중수소의 수가 상이하고, 상기 두 종류 이상의 화합물은 서로 중수소의 수가 동일한 것을 특징으로 하는 정량방법.
- 제21항에 있어서, 상기 하나의 화합물의 RA 및 RC가 각각 CH3 및 CD3이고, 상기 다른 하나의 화합물의 RA 및 RC는 각각 CD3 및 CH3인 것을 특징으로 하는 정량방법.
- 제21항에 있어서, 상기 하나의 화합물의 RA 및 RC가 각각 C2H5 및 C2D5이고, 상기 다른 하나의 화합물의 RA 및 RC는 각각 C2D5 및 C2H5인 것을 특징으로 하는 정량방법.
- 제12항에 있어서, 상기 분석체는 단백질, 탄수화물 또는 지질인 것을 특징으로 하는 정량방법.
- 제24항에 있어서, 상기 분석체는 펩티드인 것을 특징으로 하는 정량방법.
- 제24항에 있어서, 상기 분석체는 핵산, 핵산 유도체 또는 스테로이드인 것을 특징으로 하는 정량방법.
- 제12항에 있어서, 상기 정량방법은 사중극자 이온트랩 질량분석기를 이용하는 것을 특징으로 하는 정량방법.
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JP2013525824A JP5683706B2 (ja) | 2010-08-23 | 2011-08-23 | ラベリング剤とこれを用いたアミノ酸配列およびタンパク質多重定量同時分析方法 |
EP11820170.6A EP2610243A4 (en) | 2010-08-23 | 2011-08-23 | MARKING AGENT AND SEQUENCE OF AMINO ACIDS USING THE SAME, AND METHOD FOR PROVIDING SIMULTANEOUS QUANTITATIVE ANALYSIS OF MULTIPLE PROTEINS |
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US11085927B2 (en) | 2016-06-03 | 2021-08-10 | President And Fellows Of Harvard College | Techniques for high throughput targeted proteomic analysis and related systems and methods |
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CN114436765B (zh) * | 2021-12-24 | 2023-03-31 | 中南大学 | 一种苄位氘代的α,α-二氘苄碘、二氘苄胺、二氘药物分子及其合成方法 |
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JP5683706B2 (ja) | 2015-03-11 |
CN103228621A (zh) | 2013-07-31 |
US8809012B2 (en) | 2014-08-19 |
JP2013536433A (ja) | 2013-09-19 |
US20130183704A1 (en) | 2013-07-18 |
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