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2015 ; 14
(9
): 3658-69
Nephropedia Template TP
gab.com Text
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English Wikipedia
Mining Missing Membrane Proteins by High-pH Reverse-Phase StageTip Fractionation
and Multiple Reaction Monitoring Mass Spectrometry
#MMPMID26202522
Kitata RB
; Dimayacyac-Esleta BR
; Choong WK
; Tsai CF
; Lin TD
; Tsou CC
; Weng SH
; Chen YJ
; Yang PC
; Arco SD
; Nesvizhskii AI
; Sung TY
; Chen YJ
J Proteome Res
2015[Sep]; 14
(9
): 3658-69
PMID26202522
show ga
Despite significant efforts in the past decade toward complete mapping of the
human proteome, 3564 proteins (neXtProt, 09-2014) are still "missing proteins".
Over one-third of these missing proteins are annotated as membrane proteins,
owing to their relatively challenging accessibility with standard shotgun
proteomics. Using nonsmall cell lung cancer (NSCLC) as a model study, we aim to
mine missing proteins from disease-associated membrane proteome, which may be
still largely under-represented. To increase identification coverage, we employed
Hp-RP StageTip prefractionation of membrane-enriched samples from 11 NSCLC cell
lines. Analysis of membrane samples from 20 pairs of tumor and adjacent normal
lung tissue was incorporated to include physiologically expressed membrane
proteins. Using multiple search engines (X!Tandem, Comet, and Mascot) and
stringent evaluation of FDR (MAYU and PeptideShaker), we identified 7702 proteins
(66% membrane proteins) and 178 missing proteins (74 membrane proteins) with
PSM-, peptide-, and protein-level FDR of 1%. Through multiple reaction monitoring
using synthetic peptides, we provided additional evidence of eight missing
proteins including seven with transmembrane helix domains. This study
demonstrates that mining missing proteins focused on cancer membrane subproteome
can greatly contribute to map the whole human proteome. All data were deposited
into ProteomeXchange with the identifier PXD002224.