Long single alpha-helical tail domains bridge the gap between structure and function of myosin VI.
Long single alpha-helical tail domains bridge the gap between structure and function of myosin VI.
复制标题
长的单α-螺旋尾域弥合肌球蛋白VI的结构和功能之间的缝隙。
DOI:
10.1038/nsmb.1429
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发表时间:
2008-06
影响因子:
16.8
通讯作者:
Spudich, James A.
中科院分区:
文献类型:
--
作者:
Spink, Benjamin J.;Sivaramakrishnan, Sivaraj;Lipfert, Jan;Doniach, Sebastian;Spudich, James A.
Myosin VI has challenged the lever arm hypothesis of myosin movement because of its ability to take ~36-nm steps along actin with a canonical lever arm that seems to be too short to allow such large steps. Here we demonstrate that the large step of dimeric myosin VI is primarily made possible by a medial tail in each monomer that forms a rare single α-helix of ~10 nm, which is anchored to the calmodulin-bound IQ domain by a globular proximal tail. With the medial tail contributing to the ~36-nm step, rather than dimerizing as previously proposed, we show that the cargo binding domain is the dimerization interface. Furthermore, the cargo binding domain seems to be folded back in the presence of the catalytic head, constituting a potential regulatory mechanism that inhibits dimerization.
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影响因子:
64.8
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通讯作者:
Schröder, RR
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