Crystal structure of the Candida albicans kinesin-8 motor domain

Experimental Data Snapshot

  • Resolution: 2.01 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 

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Kinesin-8-specific loop-2 controls the dual activities of the motor domain according to tubulin protofilament shape.

Hunter, B.Benoit, M.P.M.H.Asenjo, A.B.Doubleday, C.Trofimova, D.Frazer, C.Shoukat, I.Sosa, H.Allingham, J.S.

(2022) Nat Commun 13: 4198-4198

  • DOI: https://doi.org/10.1038/s41467-022-31794-3
  • Primary Citation of Related Structures:  
    7LFF, 7TQX, 7TQY, 7TQZ, 7TR0, 7TR1, 7TR2, 7TR3

  • PubMed Abstract: 

    Kinesin-8s are dual-activity motor proteins that can move processively on microtubules and depolymerize microtubule plus-ends, but their mechanism of combining these distinct activities remains unclear. We addressed this by obtaining cryo-EM structures (2.6-3.9 Å) of Candida albicans Kip3 in different catalytic states on the microtubule lattice and on a curved microtubule end mimic. We also determined a crystal structure of microtubule-unbound CaKip3-ADP (2.0 Å) and analyzed the biochemical activity of CaKip3 and kinesin-1 mutants. These data reveal that the microtubule depolymerization activity of kinesin-8 originates from conformational changes of its motor core that are amplified by dynamic contacts between its extended loop-2 and tubulin. On curved microtubule ends, loop-1 inserts into preceding motor domains, forming head-to-tail arrays of kinesin-8s that complement loop-2 contacts with curved tubulin and assist depolymerization. On straight tubulin protofilaments in the microtubule lattice, loop-2-tubulin contacts inhibit conformational changes in the motor core, but in the ADP-Pi state these contacts are relaxed, allowing neck-linker docking for motility. We propose that these tubulin shape-induced alternations between pro-microtubule-depolymerization and pro-motility kinesin states, regulated by loop-2, are the key to the dual activity of kinesin-8 motors.

  • Organizational Affiliation

    Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, K7L 3N6, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kinesin-like protein
A, B
445Candida albicans SC5314Mutation(s): 0 
Gene Names: KIP3orf19.7353CAALFM_C305720CA
Find proteins for A0A1D8PKA4 (Candida albicans (strain SC5314 / ATCC MYA-2876))
Explore A0A1D8PKA4 
Go to UniProtKB:  A0A1D8PKA4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1D8PKA4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.01 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.99α = 86.9
b = 52.68β = 79.996
c = 86.75γ = 89.924
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)Canada169149

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-09
    Type: Initial release
  • Version 1.1: 2022-08-17
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description