3T0Q

Motor Domain Structure of the Kar3-like kinesin from Ashbya gossypii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Crystal structure of the Kar3-like kinesin motor domain from the filamentous fungus Ashbya gossypii.

Duan, D.Hnatchuk, D.J.Brenner, J.Davis, D.Allingham, J.S.

(2012) Proteins 80: 1016-1027

  • DOI: https://doi.org/10.1002/prot.24004
  • Primary Citation of Related Structures:  
    3T0Q

  • PubMed Abstract: 

    Kar3 kinesins are microtubule (MT) minus-end-directed motors with pleiotropic functions in mitotic spindle formation and nuclear movement in budding and fission yeasts. A Kar3-like kinesin is also expressed by the filamentous fungus Ashbya gossypi, which exhibits different nuclear movement challenges from its yeast relatives. Presented here is a 2.35 Å crystal structure and enzymatic analysis of the AgKar3 motor domain (AgKar3MD). Compared to the previously published Saccharomyces cerevisiae Kar3MD structure (ScKar3MD), AgKar3MD displays differences in the conformation of some of its nucleotide-binding motifs and peripheral elements. Unlike ScKar3MD, the salt bridge between Switch I and Switch II in AgKar3MD is broken. Most of the Switch I, and the adjoining region of helix α3, are also disordered instead of bending into the active site cleft as is observed in ScKar3MD. These aspects of AgKar3MD are highly reminiscent of the ScKar3 R598A mutant that disrupts the Switch I-Switch II salt bridge and impairs MT-stimulated ATPase activity of the motor. Subtle differences in the disposition of secondary structure elements in the small lobe (β1a, β1b, and β1c) at the edge of the MD are also apparent even though it contains approximately the same number of residues as ScKar3. These differences may reflect the unique enzymatic properties we measured for this motor, which include a lower MT-stimulated ATPase rate relative to ScKar3, or they could relate to its interactions with different regulatory companion proteins than its budding yeast counterpart.


  • Organizational Affiliation

    Department of Biochemistry, Queen’s University, Kingston, Ontario, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AGR253Wp349Eremothecium gossypii ATCC 10895Mutation(s): 0 
Gene Names: AGOS_AGR253WAGR253WAGR253Wp
UniProt
Find proteins for Q74ZE6 (Eremothecium gossypii (strain ATCC 10895 / CBS 109.51 / FGSC 9923 / NRRL Y-1056))
Explore Q74ZE6 
Go to UniProtKB:  Q74ZE6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ74ZE6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.866α = 90
b = 84.623β = 90
c = 101.141γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-04-04
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Refinement description
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description