5H53

The structure of rabbit skeletal muscle actomyosin rigor complex at 5.2 angstrom.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.2 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of actomyosin rigour complex at 5.2 angstrom resolution and insights into the ATPase cycle mechanism

Fujii, T.Namba, K.

(2017) Nat Commun 8: 13969-13969

  • DOI: 10.1038/ncomms13969

  • PubMed Abstract: 
  • Muscle contraction is driven by cyclic association and dissociation of myosin head of the thick filament with thin actin filament coupled with ATP binding and hydrolysis by myosin. However, because of the absence of actomyosin rigour structure at hig ...

    Muscle contraction is driven by cyclic association and dissociation of myosin head of the thick filament with thin actin filament coupled with ATP binding and hydrolysis by myosin. However, because of the absence of actomyosin rigour structure at high resolution, it still remains unclear how the strong binding of myosin to actin filament triggers the release of hydrolysis products and how ATP binding causes their dissociation. Here we report the structure of mammalian skeletal muscle actomyosin rigour complex at 5.2 Å resolution by electron cryomicroscopy. Comparison with the structures of myosin in various states shows a distinctly large conformational change, providing insights into the ATPase-coupled reaction cycle of actomyosin. Based on our observations, we hypothesize that asymmetric binding along the actin filament could function as a Brownian ratchet by favouring directionally biased thermal motions of myosin and actin.


    Organizational Affiliation

    Graduate School of Frontier Biosciences, Osaka University, and Riken Quantitative Biology Center, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Skeletal muscle myosin heavy chain MyHC-EO/IIL
A
845Oryctolagus cuniculusGene Names: MYH13
Find proteins for Q9GJP9 (Oryctolagus cuniculus)
Go to Gene View: MYH13
Go to UniProtKB:  Q9GJP9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Myosin regulatory light chain 2, skeletal muscle isoform type 1
B
146Oryctolagus cuniculus
Find proteins for P24732 (Oryctolagus cuniculus)
Go to UniProtKB:  P24732
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Myosin light chain 1/3, skeletal muscle isoform
C
153Oryctolagus cuniculusGene Names: MYL1
Find proteins for P02602 (Oryctolagus cuniculus)
Go to Gene View: MYL1
Go to UniProtKB:  P02602
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Actin, alpha skeletal muscle
D, E
375Oryctolagus cuniculusGene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
D, E
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HIC
Query on HIC
D, E
L-PEPTIDE LINKINGC7 H11 N3 O2HIS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.2 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2016-11-04 
  • Released Date: 2017-01-18 
  • Deposition Author(s): Fujii, T., Namba, K.

Revision History 

  • Version 1.0: 2017-01-18
    Type: Initial release
  • Version 1.1: 2017-01-25
    Type: Database references