title: Utility of RNA-seq and GPMDB protein observation frequency for improving the sensitivity of protein identification by tandem MS.
abstract: Tandem mass spectrometry (MS/MS) followed by database search is the method of choice for protein identification in proteomic studies. Database searching methods employ spectral matching algorithms and statistical models to identify and quantify proteins in a sample. In general, these methods do not utilize any information other than spectral data for protein identification. However, considering the wealth of external data available for many biological systems, analysis methods can incorporate such information to improve the sensitivity of protein identification. In this study, we present a method to utilize Global Proteome Machine Database identification frequencies and RNA-seq transcript abundances to adjust the confidence scores of protein identifications. The method described is particularly useful for samples with low-to-moderate proteome coverage (i.e., <2000-3000 proteins), where we observe up to an 8% improvement in the number of proteins identified at a 1% false discovery rate.
authors.affiliation: Department of Computational Medicine and Bioinformatics and ‡Department of Pathology, University of Michigan , Ann Arbor, Michigan 48109, United States.
authors.forename: Avinash K
authors.initials: AK
authors.lastname: Shanmugam
authors.forename: Anastasia K
authors.initials: AK
authors.lastname: Yocum
authors.forename: Alexey I
authors.initials: AI
authors.lastname: Nesvizhskii
mesh_terms: D045744:Cell Line, Tumor; D030562:Databases, Protein; D006801:Humans; D015233:Models, Statistical; D011506:Proteins / Q000737:chemistry / Q000145:classification*; D020543:Proteome / Q000032:analysis / Q000737:chemistry; D040901:Proteomics / Q000379:methods*; D015203:Reproducibility of Results; D017423:Sequence Analysis, RNA / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D011506:Proteins; D020543:Proteome