Download MendeleyExploiting cryo-EM structures of actomyosin-5a to reveal the physical properties of its lever.
Gravett, M.S.C., Klebl, D.P., Harlen, O.G., Read, D.J., Muench, S.P., Harris, S.A., Peckham, M.(2024) Structure 32: 2316-2324.e6
- PubMed: 39454567
- DOI: https://doi.org/10.1016/j.str.2024.09.025
- Primary Citation of Related Structures:
8OF8 - PubMed Abstract:
Myosin 5a (Myo5a) is a dimeric processive motor protein that transports cellular cargos along filamentous actin (F-actin). Its long lever is responsible for its large power-stroke, step size, and load-bearing ability. Little is known about the levers' structure and physical properties, and how they contribute to walking mechanics. Using cryoelectron microscopy (cryo-EM) and molecular dynamics (MD) simulations, we resolved the structure of monomeric Myo5a, comprising the motor domain and full-length lever, bound to F-actin. The range of its lever conformations revealed its physical properties, how stiffness varies along its length and predicts a large, 35 nm, working stroke. Thus, the newly released trail head in a dimeric Myo5a would only need to perform a small diffusive search for its new binding site on F-actin, and stress would only be generated across the dimer once phosphate is released from the lead head, revealing new insight into the walking behavior of Myo5a.
- Astbury Centre for Structural Molecular Biology, University of Leeds, LS2 9JT Leeds, UK; School of Molecular and Cellular Biology, University of Leeds, LS2 9JT Leeds, UK; School of Physics and Astronomy, University of Leeds, LS2 9JT Leeds, UK. Electronic address: m.s.c.gravett@uu.nl.
Organizational Affiliation:
