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: 2.3 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.207 

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

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kinesin-like protein KAR3
A
403Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 5 
Gene Names: KAR3
Find proteins for P17119 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P17119
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Spindle pole body-associated protein VIK1
B
333Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 7 
Gene Names: VIK1
Find proteins for Q12045 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q12045
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

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Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
EBC
Query on EBC

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Download CCD File 
B
N,N'-ethane-1,2-diylbis(2-iodoacetamide)
C6 H10 I2 N2 O2
RLFPCLMBTQOMLI-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 88.060α = 90.00
b = 94.939β = 90.00
c = 114.590γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
REFMACrefinement
PHASERphasing
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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