Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A2B 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A2B 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 102513.10 
• Atom Count: 6273 
• Residue Count: 892 
• Unique protein chains: 2

3GN4

Myosin lever arm

• DOI: 10.2210/pdb3GN4/pdb

• Classification: MOTOR PROTEIN
• Organism(s): Drosophila melanogaster, Sus scrofa
• Expression System: Spodoptera frugiperda


• Deposited: 2009-03-16 Released: 2009-09-08 
• Deposition Author(s): Mukherjea, M., Llinas, P., Kim, H., Travaglia, M., Safer, D., Zong, A.B., Menetrey, J., Franzini-Armstrong, C., Selvin, P.R., Houdusse, A., Sweeney, H.L.

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Experimental Data Snapshot

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

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

• PubMed: 19664948 
• 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 (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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Myosin-VI	A, E	148	Sus scrofa	Mutation(s): 0  Gene Names: MYO6
Find proteins for Q29122 (Sus scrofa) Go to Gene View: MYO6 Go to UniProtKB:  Q29122

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Calmodulin	B, D, F, H	149	Drosophila melanogaster	Mutation(s): 0  Gene Names: Cam
Find proteins for P62152 (Drosophila melanogaster) Go to UniProtKB:  P62152

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CA	B, F	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
MG	D, H	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

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 = 51.790	α = 90.00
b = 118.390	β = 90.00
c = 182.060	γ = 90.00

Software Package:

Software Name	Purpose
PHASER	phasing
SCALA	data scaling
ADSC	data collection
XDS	data reduction
PHENIX	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-03-16 
• Released Date: 2009-09-08 
• Deposition Author(s): Mukherjea, M., Llinas, P., Kim, H., Travaglia, M., Safer, D., Zong, A.B., Menetrey, J., Franzini-Armstrong, C., Selvin, P.R., Houdusse, A., Sweeney, H.L.

Revision History 

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