肽质量指纹图谱
质谱法
自下而上蛋白质组学
蛋白质组
化学
蛋白质组学
肽
基质辅助激光解吸/电离
蛋白质质谱法
串联质量标签
串联质谱法
凝胶电泳
假定蛋白
计算生物学
色谱法
定量蛋白质组学
生物化学
生物
基因
解吸
吸附
有机化学
作者
Jens Mattow,Frank Schmidt,Wolfgang Höhenwarter,Frank Siejak,Ulrich E. Schaible,Stefan H. E. Kaufmann
出处
期刊:Proteomics
[Wiley]
日期:2004-10-01
卷期号:4 (10): 2927-2941
被引量:28
标识
DOI:10.1002/pmic.200400908
摘要
Abstract Protein identification by matrix‐assisted laser desorption/ionization mass‐spectrometry peptide mass fingerprinting (MALDI‐MS PMF) represents a cornerstone of proteomics. However, it often fails to identify low‐molecular‐mass proteins, protein fragments, and protein mixtures reliably. To overcome these limitations, PMF can be complemented by tandem mass spectrometry and other search strategies for unambiguous protein identification. The present study explores the advantages of using a MALDI‐MS‐based approach, designated minimal protein identifier (MPI) approach, for protein identification. This is illustrated for culture supernatant (CSN) proteins of Mycobacterium tuberculosis H37Rv after separation by two‐dimensional gel electrophoresis (2‐DE). The MPI approach takes into consideration that proteins yield characteristic peptides upon proteolytic cleavage. In this study, peptide mixtures derived from tryptic protein cleavage were analyzed by MALDI‐MS and the resulting spectra were compared with template spectra of previously identified counterparts. The MPI approach allowed protein identification by few protein‐specific signature peptide masses and revealed truncated variants of mycobacterial elongation factor EF‐Tu, previously not identified by PMF. Furthermore, the MPI approach can be employed to track proteins in 2‐DE gels, as demonstrated for the 14 kDa antigen, the 10 kDa chaperone, and the conserved hypothetical protein Rv0569 of M. tuberculosis H37Rv. Furthermore, it is shown that the power of the MPI approach strongly depends on distinct factors, most notably on the complexity of the proteome analyzed and accuracy of the mass spectrometer used for peptide mass determination.
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