The structure of the kinesin-1 motor-tail complex reveals the mechanism of autoinhibition.
The structure of the kinesin-1 motor-tail complex reveals the mechanism of autoinhibition.
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DOI:
10.1126/science.1204824
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发表时间:
2011-08-12
期刊:
影响因子:
--
通讯作者:
Kozielski F
中科院分区:
文献类型:
--
作者:
Kaan HY;Hackney DD;Kozielski F
When not transporting cargo, kinesin-1 is autoinhibited by binding of a tail region to the motor domains, but the mechanism of inhibition is unclear. We report the crystal structure of a motor domain dimer in complex with its tail domain at 2.2 Å and compare it with a structure of the motor domain alone at 2.7 Å. These structures indicate that neither an induced conformational change nor steric blocking is the cause of inhibition. Instead, the tail cross-links the motor domains at a second position, in addition to the coiled-coil. This ‘double lockdown’, by cross-linking at two positions, prevents the movement of the motor domains that is needed to undock the neck linker and release ADP. This autoinhibition mechanism could extend to some other kinesins.
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