3GN4

Myosin lever arm


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.208 

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

  • 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 (converte ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin-VI
A, E
148Sus scrofaMutation(s): 0 
Gene Names: MYO6
Find proteins for Q29122 (Sus scrofa)
Go to Gene View: MYO6
Go to UniProtKB:  Q29122
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Calmodulin
B, D, F, H
149Drosophila melanogasterMutation(s): 0 
Gene Names: Cam
Find proteins for P62152 (Drosophila melanogaster)
Go to UniProtKB:  P62152
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
B, F
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
D, H
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.790α = 90.00
b = 118.390β = 90.00
c = 182.060γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALAdata scaling
ADSCdata collection
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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