The isoforms of α-actin and myosin affect the Ca2+ regulation of the actin-myosin interaction in the heart.

Abstract:

:Myocardium of mammals contains a wide range of isoforms of proteins that provides contractile function of the heart. These are two isoforms of ventricular and two of atrial myosin, α- and β-tropomyosin, and two isoforms of α-actin: cardiac and skeletal. We believe that the difference in the amino acid sequence of α-actin can affect the calcium regulation of the actin-myosin interaction. To test this hypothesis, we investigated effects of the isoforms of α-actin, cardiac and skeletal, and the isoforms of cardiac myosin on the calcium regulation of the actin-myosin interaction in an in vitro motility assay using reconstructed regulated thin filaments. The results show that isoforms of α-actin and the ratio of α/β-chains of Tpm differently affect the calcium regulation of the actin-myosin interaction in myocardium in dependence on cardiac myosin isoforms.

authors

Shchepkin DV,Nikitina LV,Bershitsky SY,Kopylova GV

doi

10.1016/j.bbrc.2017.06.043

subject

Has Abstract

pub_date

2017-08-19 00:00:00

pages

324-329

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(17)31174-9

journal_volume

490

pub_type

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