Abstract:
:The regulation of mitochondrial function is essential for cardiomyocyte adaptation to cellular stress. While it has long been understood that phosphorylation regulates flux through metabolic pathways, novel phosphorylation sites are continually being discovered in all functionally distinct areas of the mitochondrial proteome. Extracting biologically meaningful information from these phosphorylation sites requires an adaptable, sensitive, specific and robust method for their quantification. Here we report a multiple reaction monitoring-based mass spectrometric workflow for quantifying site-specific phosphorylation of mitochondrial proteins. Specifically, chromatographic and mass spectrometric conditions for 68 transitions derived from 23 murine and human phosphopeptides, and their corresponding unmodified peptides, were optimized. These methods enabled the quantification of endogenous phosphopeptides from the outer mitochondrial membrane protein VDAC, and the inner membrane proteins ANT and ETC complexes I, III and V. The development of this quantitative workflow is a pivotal step for advancing our knowledge and understanding of the regulatory effects of mitochondrial protein phosphorylation in cardiac physiology and pathophysiology. This article is part of a Special Issue entitled: Translational Proteomics.
journal_name
J Proteomicsjournal_title
Journal of proteomicsauthors
Lam MP,Scruggs SB,Kim TY,Zong C,Lau E,Wang D,Ryan CM,Faull KF,Ping Pdoi
10.1016/j.jprot.2012.02.014subject
Has Abstractpub_date
2012-08-03 00:00:00pages
4602-9issue
15eissn
1874-3919issn
1876-7737pii
S1874-3919(12)00098-Xjournal_volume
75pub_type
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