4ETP

C-terminal motor and motor homology domain of Kar3Vik1 fused to a synthetic heterodimeric coiled coil

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Kar3Vik1, a member of the kinesin-14 superfamily, shows a novel kinesin microtubule binding pattern.

Rank, K.C., Chen, C.J., Cope, J., Porche, K., Hoenger, A., Gilbert, S.P., Rayment, I.

(2012) J Cell Biol 197: 957-970

  • DOI: 10.1083/jcb.201201132
  • Primary Citation of Related Structures:  
    4ETP

  • PubMed Abstract: 

    • Kinesin-14 motors generate microtubule minus-end-directed force used in mitosis and meiosis. These motors are dimeric and operate with a nonprocessive powerstroke mechanism, but the role of the second head in motility has been unclear. In Saccharomyc ...

    Kinesin-14 motors generate microtubule minus-end-directed force used in mitosis and meiosis. These motors are dimeric and operate with a nonprocessive powerstroke mechanism, but the role of the second head in motility has been unclear. In Saccharomyces cerevisiae, the Kinesin-14 Kar3 forms a heterodimer with either Vik1 or Cik1. Vik1 contains a motor homology domain that retains microtubule binding properties but lacks a nucleotide binding site. In this case, both heads are implicated in motility. Here, we show through structural determination of a C-terminal heterodimeric Kar3Vik1, electron microscopy, equilibrium binding, and motility that at the start of the cycle, Kar3Vik1 binds to or occludes two αβ-tubulin subunits on adjacent protofilaments. The cycle begins as Vik1 collides with the microtubule followed by Kar3 microtubule association and ADP release, thereby destabilizing the Vik1-microtubule interaction and positioning the motor for the start of the powerstroke. The results indicate that head-head communication is mediated through the adjoining coiled coil.

    Organizational Affiliation: 

    Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Kinesin-like protein KAR3A403Saccharomyces cerevisiae S288CMutation(s): 5 
Gene Names: KAR3, kar3p, P9659.16, YPR141C
Find proteins for P17119 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P17119 
Go to UniProtKB:  P17119
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Spindle pole body-associated protein VIK1B333Saccharomyces cerevisiae S288CMutation(s): 7 
Gene Names: VIK1, Vik1p, YPL253C
Find proteins for Q12045 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q12045 
Go to UniProtKB:  Q12045
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.06α = 90
b = 94.939β = 90
c = 114.59γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-27
    Type: Initial release
  • Version 1.1: 2013-08-07
    Changes: Database references