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Deacon JC, Bloemink MJ, Rezavandi H, et al. Erratum to: Identification of functional differences between recombinant human α and β cardiac myosin motors. Cell Mol Life Sci. 2012;69(24):4239-55doi: 10.1007/s00018-012-1111-5.
Deacon, J. C., Bloemink, M. J., Rezavandi, H., Geeves, M. A., & Leinwand, L. A. (2012). Erratum to: Identification of functional differences between recombinant human α and β cardiac myosin motors. Cellular and molecular life sciences : CMLS, 69(24), 4239-55. https://doi.org/10.1007/s00018-012-1111-5
Deacon, John C, et al. "Erratum to: Identification of functional differences between recombinant human α and β cardiac myosin motors." Cellular and molecular life sciences : CMLS vol. 69,24 (2012): 4239-55. doi: https://doi.org/10.1007/s00018-012-1111-5
Deacon JC, Bloemink MJ, Rezavandi H, Geeves MA, Leinwand LA. Erratum to: Identification of functional differences between recombinant human α and β cardiac myosin motors. Cell Mol Life Sci. 2012 Dec;69(24):4239-55. doi: 10.1007/s00018-012-1111-5. PMID: 23001010; PMCID: PMC3685716.
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Cell Mol Life Sci. 2012 Dec;69(24):4239-55. doi: 10.1007/s00018-012-1111-5.

Erratum to: Identification of functional differences between recombinant human α and β cardiac myosin motors.

Cellular and molecular life sciences : CMLS

John C Deacon, Marieke J Bloemink, Heresh Rezavandi, Michael A Geeves, Leslie A Leinwand

Affiliations

  1. Department of Molecular, Cellular and Developmental Biology and Biofrontiers Institute, University of Colorado, MCDB, UCB 347, Boulder, CO 80309, USA.

PMID: 23001010 PMCID: PMC3685716 DOI: 10.1007/s00018-012-1111-5

Abstract

The myosin isoform composition of the heart is dynamic in health and disease and has been shown to affect contractile velocity and force generation. While different mammalian species express different proportions of α and β myosin heavy chain, healthy human heart ventricles express these isoforms in a ratio of about 1:9 (α:β) while failing human ventricles express no detectable α-myosin. We report here fast-kinetic analysis of recombinant human α and β myosin heavy chain motor domains. This represents the first such analysis of any human muscle myosin motor and the first of α-myosin from any species. Our findings reveal substantial isoform differences in individual kinetic parameters, overall contractile character, and predicted cycle times. For these parameters, α-subfragment 1 (S1) is far more similar to adult fast skeletal muscle myosin isoforms than to the slow β isoform despite 91% sequence identity between the motor domains of α- and β-myosin. Among the features that differentiate α- from β-S1: the ATP hydrolysis step of α-S1 is ~ten-fold faster than β-S1, α-S1 exhibits ~five-fold weaker actin affinity than β-S1, and actin·α-S1 exhibits rapid ADP release, which is >ten-fold faster than ADP release for β-S1. Overall, the cycle times are ten-fold faster for α-S1 but the portion of time each myosin spends tightly bound to actin (the duty ratio) is similar. Sequence analysis points to regions that might underlie the basis for this finding.

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