F-肌动蛋白是一种具有随机可变扭曲的螺旋结构。

F-actin is a helix with a random variable twist.

作者信息

Egelman E H, Francis N, DeRosier D J

出版信息

Nature. 1982 Jul 8;298(5870):131-5. doi: 10.1038/298131a0.

PMID:7201078

Abstract

Image analysis of isolated F-actin filaments shows that the actin helix can be described by a constant rise per subunit but a considerably variable and randomized twist (number of units per turn). The ability of actin subunits to rotate through angles of the order of 10 degrees from their helically ideal positions helps to explain actin's capacity to form many different polymorphic structures.

摘要

对分离出的F-肌动蛋白丝进行图像分析表明，肌动蛋白螺旋可通过每个亚基恒定的上升高度来描述，但扭转角度（每圈的亚基数量）变化很大且随机。肌动蛋白亚基能够从其螺旋理想位置旋转大约10度的角度，这有助于解释肌动蛋白形成许多不同多晶型结构的能力。