1F9W

CRYSTAL STRUCTURES OF MUTANTS REVEAL A SIGNALLING PATHWAY FOR ACTIVATION OF THE KINESIN MOTOR ATPASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.230 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

A structural pathway for activation of the kinesin motor ATPase.

Yun, M.Zhang, X.Park, C.G.Park, H.W.Endow, S.A.

(2001) EMBO J 20: 2611-2618

  • DOI: https://doi.org/10.1093/emboj/20.11.2611
  • Primary Citation of Related Structures:  
    1F9T, 1F9U, 1F9V, 1F9W

  • PubMed Abstract: 

    Molecular motors move along actin or microtubules by rapidly hydrolyzing ATP and undergoing changes in filament-binding affinity with steps of the nucleotide hydrolysis cycle. It is generally accepted that motor binding to its filament greatly increases the rate of ATP hydrolysis, but the structural changes in the motor associated with ATPase activation are not known. To identify the conformational changes underlying motor movement on its filament, we solved the crystal structures of three kinesin mutants that decouple nucleotide and microtubule binding by the motor, and block microtubule-activated, but not basal, ATPase activity. Conformational changes in the structures include a disordered loop and helices in the switch I region and a visible switch II loop, which is disordered in wild-type structures. Switch I moved closer to the bound nucleotide in two mutant structures, perturbing water-mediated interactions with the Mg2+. This could weaken Mg2+ binding and accelerate ADP release to activate the motor ATPASE: The structural changes we observe define a signaling pathway within the motor for ATPase activation that is likely to be essential for motor movement on microtubules.


  • Organizational Affiliation

    Department of Structural Biology, St Jude Children's Research Hospital, Memphis, TN 38105, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
KINESIN-LIKE PROTEIN KAR3
A, B
347Saccharomyces cerevisiaeMutation(s): 2 
EC: 5.6.1.4
UniProt
Find proteins for P17119 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P17119 
Go to UniProtKB:  P17119
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP17119
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.230 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.89α = 90
b = 62.89β = 90
c = 153.56γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations
  • Version 1.4: 2024-02-07
    Changes: Data collection