Mechanochemical model for myosin V

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Mechanochemical model for myosin V. / Craig, Erin M.; Linke, Heiner.

In: Proceedings of the National Academy of Sciences, Vol. 106, No. 43, 2009, p. 18261-18266.

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Craig, Erin M. ; Linke, Heiner. / Mechanochemical model for myosin V. In: Proceedings of the National Academy of Sciences. 2009 ; Vol. 106, No. 43. pp. 18261-18266.

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TY - JOUR

T1 - Mechanochemical model for myosin V

AU - Craig, Erin M.

AU - Linke, Heiner

PY - 2009

Y1 - 2009

N2 - A rigorous numerical test of a hypothetical mechanism of a molecular motor should model explicitly the diffusive motion of the motor's degrees of freedom as well as the transition rates between the motor's chemical states. We present such a Brownian dynamics, mechanochemcial model of the coarse-grain structure of the dimeric, linear motor myosin V. Compared with run-length data, our model provides strong support for a proposed strain-controlled gating mechanism that enhances processivity. We demonstrate that the diffusion rate of a detached motor head during motor stepping is self-consistent with known kinetic rate constants and can explain the motor's key performance features, such as speed and stall force. We present illustrative and realistic animations of motor stepping in the presence of thermal noise. The quantitative success and illustrative power of this type of model suggest that it will be useful in testing our understanding of a range of biological and synthetic motors.

AB - A rigorous numerical test of a hypothetical mechanism of a molecular motor should model explicitly the diffusive motion of the motor's degrees of freedom as well as the transition rates between the motor's chemical states. We present such a Brownian dynamics, mechanochemcial model of the coarse-grain structure of the dimeric, linear motor myosin V. Compared with run-length data, our model provides strong support for a proposed strain-controlled gating mechanism that enhances processivity. We demonstrate that the diffusion rate of a detached motor head during motor stepping is self-consistent with known kinetic rate constants and can explain the motor's key performance features, such as speed and stall force. We present illustrative and realistic animations of motor stepping in the presence of thermal noise. The quantitative success and illustrative power of this type of model suggest that it will be useful in testing our understanding of a range of biological and synthetic motors.

KW - Brownian dynamics

KW - molecular motor

KW - strain-dependent gating

U2 - 10.1073/pnas.0908192106

DO - 10.1073/pnas.0908192106

M3 - Article

VL - 106

SP - 18261

EP - 18266

JO - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

SN - 1091-6490

IS - 43

ER -