Kinesin-binding protein remodels the kinesin motor to prevent microtubule binding.

Kinesin-binding protein remodels the kinesin motor to prevent microtubule binding.
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DOI:
10.1126/sciadv.abj9812
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发表时间:
2021-11-19
期刊:
影响因子:
13.6
通讯作者:
Cianfrocco MA
Cianfrocco MA
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Solon AL;Tan Z;Schutt KL;Jepsen L;Haynes SE;Nesvizhskii AI;Sept D;Stumpff J;Ohi R;Cianfrocco MA

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Kinesin-binding protein inhibits kinesin activity through structural alterations of the kinesin motor domain. Kinesins are regulated in space and time to ensure activation only in the presence of cargo. Kinesin-binding protein (KIFBP), which is mutated in Goldberg-Shprintzen syndrome, binds to and inhibits the catalytic motor heads of 8 of 45 kinesin superfamily members, but the mechanism remains poorly defined. Here, we used cryo–electron microscopy and cross-linking mass spectrometry to determine high-resolution structures of KIFBP alone and in complex with two mitotic kinesins, revealing structural remodeling of kinesin by KIFBP. We find that KIFBP remodels kinesin motors and blocks microtubule binding (i) via allosteric changes to kinesin and (ii) by sterically blocking access to the microtubule. We identified two regions of KIFBP necessary for kinesin binding and cellular regulation during mitosis. Together, this work further elucidates the molecular mechanism of KIFBP-mediated kinesin inhibition and supports a model in which structural rearrangement of kinesin motor domains by KIFBP abrogates motor protein activity.
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