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The architecture of kinesin-3 KLP-6 reveals a multilevel-lockdown mechanism for autoinhibition.

ABSTRACT: Autoinhibition of kinesin-3 ensures the proper spatiotemporal control of the motor activity for intracellular transport, but the underlying mechanism remains elusive. Here, we determine the full-length structure of kinesin-3 KLP-6 in a compact self-folded state. Unexpectedly, all the internal coiled-coil segments and domains in KLP-6 cooperate to successively lock down the neck and motor domains. The first coiled-coil segment is melted into several short helices that work with the motor domain to restrain the entire neck domain. The second coiled-coil segment associates with its neighboring FHA and MBS domains and integrates with the tail MATH domain to form a supramodule that synergistically wraps around the motor domain to trap the nucleotide and hinder the microtubule binding. This multilevel-lockdown mechanism for autoinhibition could be applicable to other kinesin-3 motors.

SUBMITTER: Wang W

PROVIDER: S-EPMC9314371 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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The architecture of kinesin-3 KLP-6 reveals a multilevel-lockdown mechanism for autoinhibition.

Wang Wenjuan W Ren Jinqi J Song Weiye W Zhang Yong Y Feng Wei W

Nature communications 20220725 1

Autoinhibition of kinesin-3 ensures the proper spatiotemporal control of the motor activity for intracellular transport, but the underlying mechanism remains elusive. Here, we determine the full-length structure of kinesin-3 KLP-6 in a compact self-folded state. Unexpectedly, all the internal coiled-coil segments and domains in KLP-6 cooperate to successively lock down the neck and motor domains. The first coiled-coil segment is melted into several short helices that work with the motor domain t ...[more]

PMID: 35879313

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