Discovery of protein acetylation patterns by deconvolution of peptide isomer mass spectra.

Abstract:

:Protein post-translational modifications (PTMs) play important roles in the control of various biological processes including protein-protein interactions, epigenetics and cell cycle regulation. Mass spectrometry-based proteomics approaches enable comprehensive identification and quantitation of numerous types of PTMs. However, the analysis of PTMs is complicated by the presence of indistinguishable co-eluting isomeric peptides that result in composite spectra with overlapping features that prevent the identification of individual components. In this study, we present Iso-PeptidAce, a novel software tool that enables deconvolution of composite MS/MS spectra of isomeric peptides based on features associated with their characteristic fragment ion patterns. We benchmark Iso-PeptidAce using dilution series prepared from mixtures of known amounts of synthetic acetylated isomers. We also demonstrate its applicability to different biological problems such as the identification of site-specific acetylation patterns in histones bound to chromatin assembly factor-1 and profiling of histone acetylation in cells treated with different classes of HDAC inhibitors.

journal_name

Nat Commun

journal_title

Nature communications

authors

Abshiru N,Caron-Lizotte O,Rajan RE,Jamai A,Pomies C,Verreault A,Thibault P

doi

10.1038/ncomms9648

subject

Has Abstract

pub_date

2015-10-15 00:00:00

pages

8648

issn

2041-1723

pii

ncomms9648

journal_volume

6

pub_type

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