摘要:
The present invention finds a media that can highly selectively retain proteins or peptides to be enriched/separated, as well as provides a method for selectively enriching/separating proteins or peptides using such a media. A method for enrichment/separation of a protein or a peptide, comprising separating a protein or a peptide containing an amino acid residue with a π electron-containing group by using a media with a π electron-containing group. Preferably, the amino acid residue is a tryptophan residue or a tryptophan residue modified with a sulfenyl compound, and the media is a media with phenyl group.
摘要:
The present invention provides a method for global quantitative analysis of protein that is effectively applied also for unpurified samples such as biological samples, and achieves better detection sensitivity and quantitativeness than the conventional NBS method. A method for global quantitative analysis of protein comprising: preparing two states of protein samples, a Protein sample I for analysis and a control Protein sample II; solubilizing the Protein sample I and II by urea or guanidine hydrochloride; subjecting the solubilized Protein sample I and II to modification using 2-nitro[13C6]benzenesulfenyl chloride and 2-nitro[12C6]benzenesulfenyl chloride; mixing and desalting the modified Protein sample I and II; resolubilizing by urea or guanidine hydrochloride; reducing and alkylating; subjecting to trypsin digestion in the presence of urea or guanidine hydrochloride; separating the obtained peptide mixture using a media having a phenyl group; and subjecting the enriched modified peptide fragments to mass spectrometry preferably using 3CHCA, 3H4NBA or mixture of 3H4NBA and 4CHCA as a matrix.
摘要:
The present invention provides a method which is capable of mainly detecting the objective substance by mass spectrometry and can also be applied effectively to a sample to be measured without conducting enrichment process. A mass spectrometric method comprising: in a mass spectrometry specifically ionizing a specific substance to be measured contained in a mixture sample containing the specific substance and a substance other than the specific substance by using a matrix that is more likely to ionize the specific substance than the substance other than the specific substance, to selectively measure the specific substance from the mixture. Preferably, the specific substance is a peptide modified with 2-nitrobenzenesulfenyl chloride, and the matrix is a nitrobenzene derivative such as hydroxynitrobenzoic acid. The matrix is preferably used in combination with α-cyano-4-hydroxycinnamic acid.
摘要:
The present invention provides a method capable of efficiently ionizing hydrophobic peptides in MALDI-IT, MALDI-IT-TOF, and MALDI-FTICR mass spectrometers. A method of measuring a peptide with a mass spectrometer having a MALDI (Matrix Assisted Laser Desorption/Ionization) ion source, using α-cyano-3-hydroxycinnamic acid or 3-hydroxy-4-nitrobenzoic acid as a matrix. Preferably, a peptide derivatized with 2-nitrobenzenesulfenyl chloride is measured with a MALDI-IT, MALDI-IT-TOF, or MALDI-FTICR mass spectrometer. When 3-hydroxy-4-nitrobenzoic acid is used as a matrix, the matrix is preferably used as a mixed matrix in which α-cyano-4-hydroxycinnamic acid is combined.
摘要:
The present invention provides a method for global quantitative analysis of protein that is effectively applied also for unpurified samples such as biological samples, and achieves better detection sensitivity and quantitativeness than the conventional NBS method. A method for global quantitative analysis of protein comprising: preparing two states of protein samples, a Protein sample I for analysis and a control Protein sample II; solubilizing the Protein sample I and II by urea or guanidine hydrochloride; subjecting the solubilized Protein sample I and II to modification using 2-nitro[13C6]benzenesulfenyl chloride and 2-nitro[12C6]benzenesulfenyl chloride; mixing and desalting the modified Protein sample I and II; resolubilizing by urea or guanidine hydrochloride; reducing and alkylating; subjecting to trypsin digestion in the presence of urea or guanidine hydrochloride; separating the obtained peptide mixture using a media having a phenyl group; and subjecting the enriched modified peptide fragments to mass spectrometry preferably using 3CHCA, 3H4NBA or mixture of 3H4NBA and 4CHCA as a matrix.
摘要:
The present invention provides a tumor screening marker that can be actually used in clinical practice to detect colorectal cancer, and a tumor progression marker that can complement CEA or CA19-9. Galectin-1 used as a tumor screening marker or a tumor progression marker for colorectal cancer. Galectin-3 used as a tumor screening marker. Galectin-4 used as a tumor progression marker, a tumor screening marker, or a prognostic prediction marker for colorectal cancer. A method of analyzing the galectin concentration in a collected blood sample using the galectin. A colorectal cancer marker detection kit comprising a detection antibody selected from the group consisting of a fluorescently labeled galectin-1 antibody, a fluorescently labeled galectin-3 antibody, and a fluorescently labeled galectin-4 antibody.
摘要:
It is provided an insulin resistance marker, a method of evaluating insulin resistance, a method of screening a substance that improves insulin resistance, and a pharmaceutical composition for improving insulin resistance. An insulin resistance marker including a polypeptide comprising at least any 15 continuous amino acids in the specific amino acid sequence (sequence of a proepithelin protein). An insulin resistance marker including a polynucleotide selected from the group consisting of a polynucleotide comprising at least any 45 continuous bases in the base sequence encoding the above specific amino acid sequence, and a polynucleotide that is complementary to the polynucleotide.
摘要:
The present invention provides a tumor marker and a method capable of identifying the morbidity of colon cancer. A tumor marker including a protein identified from a colon cancer tissue. A method for identify the morbidity of colon cancer using the tumor marker. The method includes: measuring the level of the protein in a sample derived from a person of interest who should be examined to identify the morbidity of colon cancer; and comparing the measured level to the normal level of the protein, wherein a higher or lower measured level than the normal level is used as one indicator indicating that there is a high possibility that the person of interest has colon cancer.
摘要:
An insulin resistance marker, a method of evaluating insulin resistance, a method of screening a substance that improves insulin resistance, and a pharmaceutical composition for improving insulin resistance are provided. The insulin resistance marker includes a polypeptide comprising at least any 15 continuous amino acids in the specific amino acid sequence of SEQ ID NO: 1 (sequence of a proepithelin protein). The insulin resistance marker includes a polynucleotide selected from the group consisting of (1) a polynucleotide comprising at least any 45 continuous bases in the base sequence of SEQ ID NO:2 encoding the above specific amino acid sequence, and (2) a polynucleotide that is complementary to the polynucleotide of (1).
摘要翻译:提供胰岛素抵抗标记,评价胰岛素抵抗的方法,筛选改善胰岛素抵抗的物质的方法和用于改善胰岛素抵抗的药物组合物。 胰岛素抵抗标记物包括在SEQ ID NO:1的特定氨基酸序列(前列腺素蛋白质序列)中包含至少15个连续氨基酸的多肽。 胰岛素抵抗标记物包括选自(1)包含编码上述特定氨基酸序列的SEQ ID NO:2的碱基序列中至少任何45个连续碱基的多核苷酸的多核苷酸,和(2)多核苷酸, 与(1)的多核苷酸互补。
摘要:
The present invention provides a tumor screening marker that can be actually used in clinical practice to detect colorectal cancer, and a tumor progression marker that can complement CEA or CA19-9. Vitronectin for use as a tumor progression marker, a tumor screening marker or a prognostic prediction marker for colorectal cancer. A method of analyzing a vitronectin concentration in a collected blood sample. In the method, a measured value of vitronectin and a reference value of vitronectin are compared. Vitronectin is preferably used in combination with existing marker for colorectal cancer such as carcinoembryonic antigen and CA19-9.