PMID- 30298249 OWN - NLM STAT- MEDLINE DCOM- 20190704 LR - 20190704 IS - 1940-6029 (Electronic) IS - 1064-3745 (Linking) VI - 1849 DP - 2018 TI - Quantification of Vitamin B(12)-Related Proteins in Marine Microbial Systems Using Selected Reaction Monitoring Mass Spectrometry. PG - 87-98 LID - 10.1007/978-1-4939-8728-3_6 [doi] AB - Mass spectrometry-based proteomic approaches to studying microbial systems enable assessment of taxonomically resolved functional capacity. A subset of these proteomic approaches are absolutely quantitative, enabling comparisons of protein expression patterns between different studies and across environments. This chapter outlines a method for applying quantitative assays in marine microbial communities, using proteins involved in vitamin B(12) (cobalamin) utilization and production as specific examples. This approach involves identifying important protein targets, determining taxonomic resolution of the required assays, identifying suitable peptides, developing and optimizing liquid chromatography-selected reaction monitoring mass spectrometry assays (LC-SRM-MS), and processing the resulting data. Implementing the method outlined here results in measurements (fmol diagnostic peptide per mug of total bulk protein) that, in this case, define the nutritional status of microbial community members with respect to vitamin B(12), and are comparable across and between marine microbial systems. FAU - Bertrand, Erin M AU - Bertrand EM AD - Department of Biology, Dalhousie University, Halifax, NS, Canada. erin.bertrand@dal.ca. LA - eng PT - Journal Article PL - United States TA - Methods Mol Biol JT - Methods in molecular biology (Clifton, N.J.) JID - 9214969 RN - 0 (Bacterial Proteins) RN - 0 (Peptide Fragments) RN - P6YC3EG204 (Vitamin B 12) SB - IM MH - Bacteria/*metabolism MH - Bacterial Proteins/*metabolism MH - *Biomass MH - Mass Spectrometry/*methods MH - Peptide Fragments/*analysis/metabolism MH - Seawater/*microbiology MH - Vitamin B 12/*metabolism MH - Water Microbiology OTO - NOTNLM OT - Mass spectrometry OT - Microbial systems OT - Selected reaction monitoring OT - Targeted metaproteomics EDAT- 2018/10/10 06:00 MHDA- 2019/07/05 06:00 CRDT- 2018/10/10 06:00 PHST- 2018/10/10 06:00 [entrez] PHST- 2018/10/10 06:00 [pubmed] PHST- 2019/07/05 06:00 [medline] AID - 10.1007/978-1-4939-8728-3_6 [doi] PST - ppublish SO - Methods Mol Biol. 2018;1849:87-98. doi: 10.1007/978-1-4939-8728-3_6.