Article
The dilated cardiomyopathy-causing mutation ACTC E361G in cardiac muscle myofibrils specifically abolishes modulation of Ca(2+) regulation by phosphorylation of troponin I.
Biophysical journal - 18 Nov 2014
Vikhorev Petr G, Song Weihua, Wilkinson Ross, Copeland O'Neal, Messer Andrew E, Ferenczi Michael A, Marston Steven B
Abstract excerpt
Phosphorylation of troponin I by protein kinase A (PKA) reduces Ca(2+) sensitivity and increases the rate of Ca(2+) release from troponin C and the rate of relaxation in cardiac muscle. In vitro experiments indicate that mutations that cause dilated cardiomyopathy (DCM) uncouple this modulation, but this has not been demonstrated in an intact contractile system. Using a Ca(2+)-jump protocol, we measured the...
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