3GN4

Myosin lever arm


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Myosin VI dimerization triggers an unfolding of a three-helix bundle in order to extend its reach

Mukherjea, M.Llinas, P.Kim, H.Travaglia, M.Safer, D.Menetrey, J.Franzini-Armstrong, C.Selvin, P.R.Houdusse, A.Sweeney, H.L.

(2009) Mol Cell 35: 305-315

  • DOI: 10.1016/j.molcel.2009.07.010
  • Primary Citation of Related Structures:  
    3GN4

  • PubMed Abstract: 
  • Myosin VI challenges the prevailing theory of how myosin motors move on actin: the lever arm hypothesis. While the reverse directionality and large powerstroke of myosin VI can be attributed to unusual properties of a subdomain of the motor (converter with a unique insert), these adaptations cannot account for the large step size on actin ...

    Myosin VI challenges the prevailing theory of how myosin motors move on actin: the lever arm hypothesis. While the reverse directionality and large powerstroke of myosin VI can be attributed to unusual properties of a subdomain of the motor (converter with a unique insert), these adaptations cannot account for the large step size on actin. Either the lever arm hypothesis needs modification, or myosin VI has some unique form of extension of its lever arm. We determined the structure of the region immediately distal to the lever arm of the motor and show that it is a three-helix bundle. Based on C-terminal truncations that display the normal range of step sizes on actin, CD, fluorescence studies, and a partial deletion of the bundle, we demonstrate that this bundle unfolds upon dimerization of two myosin VI monomers. This unconventional mechanism generates an extension of the lever arm of myosin VI.


    Organizational Affiliation

    Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia, 19104, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin-VIA, D [auth E]148Sus scrofaMutation(s): 0 
Gene Names: MYO6
Find proteins for Q29122 (Sus scrofa)
Explore Q29122 
Go to UniProtKB:  Q29122
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CalmodulinB, C [auth D], E [auth F], F [auth H]149Drosophila melanogasterMutation(s): 0 
Gene Names: CamCG8472
Find proteins for P62152 (Drosophila melanogaster)
Explore P62152 
Go to UniProtKB:  P62152
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.79α = 90
b = 118.39β = 90
c = 182.06γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-09-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance