Myosin VI dimerization triggers an unfolding of a three-helix bundle in order to extend its reach.

Myosin VI dimerization triggers an unfolding of a three-helix bundle in order to extend its reach.
复制标题

DOI:
10.1016/j.molcel.2009.07.010
复制
发表时间:
2009-08-14
期刊:
影响因子:
16
通讯作者:
Sweeney, H. Lee
Sweeney, H. Lee
中科院分区:
生物学1区
文献类型:
--
作者:
Mukherjea, Monalisa;Llinas, Paola;Kim, HyeongJun;Travaglia, Mirko;Safer, Daniel;Menetrey, Julie;Franzini-Armstrong, Clara;Selvin, Paul R.;Houdusse, Anne;Sweeney, H. Lee

文献摘要

参考文献

被引文献

相似文献

肌凝蛋白VI挑战了肌动蛋白运动的主流理论:杠杆臂假说。虽然肌凝蛋白VI的反向方向性和大功率冲程可归因于马达子域(具有独特插入的转换器)的不寻常特性,但这些适应性不能解释肌动蛋白上的大步长。要么是杠杆臂假说需要修正,要么是肌凝蛋白VI有某种独特的杠杆臂延伸形式。我们确定了该区域的结构,立即远端到电机的杠杆臂,并表明它是一个3螺旋束。基于c端截断显示肌动蛋白,CD,荧光研究和部分缺失束的正常步长范围,我们证明该束在两个肌凝蛋白VI单体二聚化时展开。这种前所未有的机制产生了肌球蛋白VI杠杆臂的延伸。
Myosin VI challenges the prevailing theory of how myosin motors move on actin: the lever arm hypothesis. While the reverse directionality and large powerstroke of myosin VI can be attributed to unusual properties of a subdomain of the motor (converter with a unique insert), these adaptations cannot account for the large step size on actin. Either the lever arm hypothesis needs modification, or myosin VI has some unique form of extension of its lever arm. We determined the structure of the region immediately distal to the lever arm of the motor and show that it is a 3-helix bundle. Based on C-terminal truncations that display the normal range of step sizes on actin, CD, fluorescence studies, and a partial deletion of the bundle, we demonstrate that this bundle unfolds upon dimerization of two myosin VI monomers. This unprecedented mechanism generates an extension of the lever arm of myosin VI.
DOI: 10.1098/rstb.2004.1566
发表时间: 2004-12-29
期刊: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
影响因子: --
作者:
Holmes, KC;Schröder, RR;Houdusse, A
通讯作者: Houdusse, A
DOI: 10.1083/jcb.200308020
发表时间: 2003-11-24
期刊: The Journal of cell biology
影响因子: --
作者:
Al-Bassam J;Cui Y;Klopfenstein D;Carragher BO;Vale RD;Milligan RA
通讯作者: Milligan RA
DOI: 10.1107/s0907444905036693
发表时间: 2006-01-01
影响因子: 2.2
作者:
Evans, P
通讯作者: Evans, P
DOI: 10.1107/s0907444904019158
发表时间: 2004-12-01
影响因子: 2.2
作者:
Emsley, P;Cowtan, K
通讯作者: Cowtan, K
DOI: 10.1529/biophysj.107.117689
发表时间: 2008-03-01
影响因子: 3.4
作者:
Aitken, Colin Echeverria;Marshall, R. Andrew;Puglisi, Joseph D.
通讯作者: Puglisi, Joseph D.