期刊
ANALYTICAL CHEMISTRY
卷 88, 期 12, 页码 6120-6125出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.6b01412
关键词
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资金
- Government of Canada through Genome Canada
- Ontario Genomics Institute [OGI-067]
- Canadian Institutes of Health Research [GPH-129340]
- Ontario Ministry of Economic Development and Innovation [REG1-4450]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- IBD Foundation
- Crohn's and Colitis Canada (CCC)
- CHEO Research Institute
- Faculty of Medicine of the University of Ottawa
Intestinal microbiota is emerging as one of the key environmental factors influencing or causing the development of numerous human diseases. Metaproteomics can provide invaluable information on the functional activities of intestinal microbiota and on host microbe interactions as well. However, the application of metaproteomics in human microbiota studies is still largely limited, in part due to the lack of accurate quantitative intestinal metaproteomic methods. Most current metaproteomic microbiota studies are based on label-free quantification, which may suffer from variability during the separate sample processing and mass spectrometry runs. In this study, we describe a quantitative metaproteomic strategy, using in vitro stable isotopically (N-15) labeled microbiota as a spike-in reference, to study the intestinal metaproteomes. We showed that the human microbiota were efficiently labeled (>95% N-15 enrichment) within 3 days under in vitro conditions, and accurate light-to-heavy protein/peptide ratio measurements were obtained using a high-resolution mass spectrometer and the quantitative proteomic software tool Census. We subsequently employed our approach to study the in vitro modulating effects of fructo-oligosaccharide and five different monosaccharides on the microbiota. Our methodology improves the accuracy of quantitative intestinal metaproteomics, which would promote the application of proteomics for functional studies of intestinal microbiota.
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