Mechanistic Insights into the Active Site and Allosteric Communication Pathways in Human Nonmuscle Myosin-2C

  1. Krishna Chinthalapudi
  2. Sarah M Heissler
  3. Matthias Preller
  4. James R Sellers  Is a corresponding author
  5. Dietmar J Manstein  Is a corresponding author
  1. Hannover Medical School, Germany
  2. National Heart, Lung and Blood Institute, National Institutes of Health, United States

Abstract

Despite a generic, highly conserved motor domain, ATP turnover kinetics and their activation by F-actin vary greatly between myosin-2 isoforms. Here, we present a 2.25 Å crystal pre-powerstroke state (ADP·VO4) structure of the human nonmuscle myosin-2C motor domain, one of the slowest myosins characterized. In combination with integrated mutagenesis, ensemble-solution kinetics, and molecular dynamics simulation approaches, the structure reveals an allosteric communication pathway that connects the distal end of the motor domain with the active site. Disruption of this pathway by mutation of hub residue R788, which forms the center of a cluster of interactions connecting the converter, the SH1-SH2 helix, the relay helix, and the lever, abolishes nonmuscle myosin-2 specific kinetic signatures. Our results provide insights into structural changes in the myosin motor domain that are triggered upon F-actin binding and contribute critically to the mechanochemical behavior of stress fibers, actin arcs, and cortical actin-based structures.

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Author details

  1. Krishna Chinthalapudi

    Institute for Biophysical Chemistry, Hannover Medical School, Hannover, Germany
    Competing interests
    The authors declare that no competing interests exist.
  2. Sarah M Heissler

    Institute for Biophysical Chemistry, Hannover Medical School, Hannover, Germany
    Competing interests
    The authors declare that no competing interests exist.
  3. Matthias Preller

    Institute for Biophysical Chemistry, Hannover Medical School, Hannover, Germany
    Competing interests
    The authors declare that no competing interests exist.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-7784-4012
  4. James R Sellers

    Laboratory of Molecular Physiology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, United States
    For correspondence
    sellersj@nhlbi.nih.gov
    Competing interests
    The authors declare that no competing interests exist.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0001-6296-564X
  5. Dietmar J Manstein

    Institute for Biophysical Chemistry, Hannover Medical School, Hannover, Germany
    For correspondence
    manstein.dietmar@mh-hannover.de
    Competing interests
    The authors declare that no competing interests exist.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0003-0763-0147

Funding

Deutsche Forschungsgemeinschaft (MA 1081_21-1)

  • Dietmar J Manstein

National Institutes of Health (Intramural Funding)

  • James R Sellers

Deutsche Forschungsgemeinschaft (PR 1478_2-1)

  • Matthias Preller

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Copyright

This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.

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  1. Krishna Chinthalapudi
  2. Sarah M Heissler
  3. Matthias Preller
  4. James R Sellers
  5. Dietmar J Manstein
(2017)
Mechanistic Insights into the Active Site and Allosteric Communication Pathways in Human Nonmuscle Myosin-2C
eLife 6:e32742.
https://doi.org/10.7554/eLife.32742

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https://doi.org/10.7554/eLife.32742