Engineering and Physical Sciences Research Council
EP/T022167/1
英国
Engineering and Physical Sciences Research Council
EP/R013012
英国
引用
ジャーナル: Structure / 年: 2024 タイトル: Exploiting cryo-EM structures of actomyosin-5a to reveal the physical properties of its lever. 著者: Molly S C Gravett / David P Klebl / Oliver G Harlen / Daniel J Read / Stephen P Muench / Sarah A Harris / Michelle Peckham / 要旨: 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 ...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.