Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 78714.40 
• Atom Count: 4800 
• Residue Count: 694 
• Unique protein chains: 1

1F9W

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

• DOI: 10.2210/pdb1F9W/pdb

• Classification: CONTRACTILE PROTEIN
• Organism(s): Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
• Expression System: Escherichia coli
• Mutation(s): 2 


• Deposited: 2000-07-11 Released: 2001-06-13 
• Deposition Author(s): Yun, M., Zhang, X., Park, C.G., Park, H.W., Endow, S.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 Å
• R-Value Free: 0.276 
• R-Value Work: 0.230 

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

• PubMed: 11387196 
• DOI: 10.1093/emboj/20.11.2611
• Primary Citation of Related Structures:  
  1F9V, 1F9U, 1F9T


• 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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
KINESIN-LIKE PROTEIN KAR3	A, B	347	Saccharomyces cerevisiae (strain ATCC 204508 / S288c)	Mutation(s): 2  Gene Names: KAR3
Find proteins for P17119 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Go to UniProtKB:  P17119

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ADP	A, B	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	A, B	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 Å
• R-Value Free: 0.276 
• R-Value Work: 0.230 
• Space Group: P 4₃

Unit Cell:

Length (Å)	Angle (°)
a = 62.890	α = 90.00
b = 62.890	β = 90.00
c = 153.560	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
X-PLOR	model building
X-PLOR	phasing
DENZO	data reduction
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-07-11 
• Released Date: 2001-06-13 
• Deposition Author(s): Yun, M., Zhang, X., Park, C.G., Park, H.W., Endow, S.A.

Revision History 

• Version 1.0: 2001-06-13
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance