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Omecamtiv Mecarbil Modulates the Kinetic and Motile Properties of Porcine β-Cardiac Myosin

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† Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, Virginia 23507, United States
‡ Department of Pathology and Laboratory Medicine, Robert Wood Johnson Medical School, Rutgers University, Piscataway, New Jersey 08854, United States
*Department of Physiological Sciences, Eastern Virginia Medical School, Norfolk, VA 23507. E-mail: [email protected]. Phone: (757) 446-5108. Fax: (757) 624-2270.
Cite this: Biochemistry 2015, 54, 10, 1963–1975
Publication Date (Web):February 13, 2015
https://doi.org/10.1021/bi5015166
Copyright © 2015 American Chemical Society
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    Abstract

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    We determined the effect of Omecamtiv Mecarbil, a novel allosteric effector of cardiac muscle myosin, on the kinetic and “in vitro” motility properties of the porcine ventricular heavy meromyosin (PV-HMM). Omecamtiv Mecarbil increases the equilibrium constant of the hydrolysis step (M-ATP ⇄ M-ADP-Pi) from 2.4 to 6 as determined by quench flow, but the maximal rates of both the hydrolysis step and tryptophan fluorescence increase are unchanged by the drug. OM also increases the amplitude of the fast phase of phosphate dissociation (AM-ADP-Pi → AM-ADP + Pi) that is associated with force production in muscle by 4-fold. These results suggest a mechanism in which hydrolysis of M-ATP to M-ADP-Pi occurs both before and after the recovery stroke, but rapid acceleration of phosphate dissociation by actin occurs only on post-recovery stroke A-M-ADP-Pi. One of the more dramatic effects of OM on PV-HMM is a 14-fold decrease in the unloaded shortening velocity measured by the in vitro motility assay. The increase in flux through phosphate dissociation and the unchanged rate of ADP dissociation (AM-ADP → AM + ADP) by the drug produce a higher duty ratio motor in which a larger fraction of myosin heads are strongly bound to actin filaments. The increased internal load produced by a larger fraction of strongly attached crossbridges explains the reduced rate of in vitro motility velocity in the presence of OM and predicts that the drug will produce slower and stronger contraction of cardiac muscle.

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    Dependence of steady-state ATP hydrolysis upon pCa and OM concentration, characteristic space–time curves for PV-HMM-powered motility of actin filaments, and modeling of the coupled hydrolysis mechanism to determine the steady-state concentrations of intermediates M↓ADP-Pi, M↑ADP-Pi, M↓ATP, and M↑ATP. This material is available free of charge via the Internet at http://pubs.acs.org.

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