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Functional dissection of myosin binding protein C phosphorylation.

Abstract：

:Cardiac myosin binding protein C (cMyBP-C) phosphorylation is differentially regulated in the normal heart and during disease development. Our objective was to examine in detail three phosphorylatable sites (Ser-273, Ser-282, and Ser-302) present in the protein's cardiac-specific sequences, as these residues are differentially and reversibly phosphorylated during normal and abnormal cardiac function. Three transgenic lines were generated: DAA, which expressed cMyBP-C containing Asp-273, Ala-282, and Ala-302, in which a charged amino acid was placed at residue 273 and the remaining two sites rendered nonphosphorylatable by substituting alanines for the two serines; AAD containing Ala-273, Ala-282, and Asp-302, in which aspartate was placed at residue 302 and the remaining two sites rendered nonphosphorylatable; and SDS containing Ser-273, Asp-282, and Ser-302. These mice were compared to mice constructed previously along similar lines: wild type, in which normal cMyBP-C is transgenically expressed, AllP-, in which alanines were substituted and ADA mice as well. DAA and AAD mice showed pathology that was more severe than cMyBP-C nulls. DAA and AAD animals exhibited left ventricular chamber dilation, interstitial fibrosis, irregular cardiac rhythm and sudden cardiac death. Our results define the effects of the sites' post-translational modifications on cMyBP-C functionality and together, give a comprehensive picture of the potential consequences of site-specific phosphorylation. Ser-282 is a key residue in controlling S2 interaction with the thick and thin filaments. The new DAA and AAD constructs show that phosphorylation at one site in the absence of the ability to phosphorylate the other sites, depending upon the particular residues involved, can lead to severe cardiac remodeling and dysfunction.

journal_name

J Mol Cell Cardiol

journal_title

Journal of molecular and cellular cardiology

authors

Gupta MK,Gulick J,James J,Osinska H,Lorenz JN,Robbins J

doi

10.1016/j.yjmcc.2013.08.006

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

39-50

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(13)00259-9

journal_volume

64

pub_type

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