7RSQ image
Deposition Date 2021-08-11
Release Date 2021-09-08
Last Version Date 2024-06-05
Entry Detail
PDB ID:
7RSQ
Keywords:
Title:
Cryo-EM structure of KIFBP core
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.80 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:KIF-binding protein
Gene (Uniprot):KIFBP
Chain IDs:A (auth: B)
Chain Length:621
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Kinesin-binding protein remodels the kinesin motor to prevent microtubule binding.
Sci Adv 7 eabj9812 eabj9812 (2021)
PMID: 34797717 DOI: 10.1126/sciadv.abj9812

Abstact

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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Primary Citation of related structures