Crystal structure of the N-terminal region of the scallop myosin rod, monoclinic (C2) form

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 

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An unstable head-rod junction may promote folding into the compact off-state conformation of regulated myosins.

Brown, J.H.Yang, Y.Reshetnikova, L.Gourinath, S.Suveges, D.Kardos, J.Hobor, F.Reutzel, R.Nyitray, L.Cohen, C.

(2008) J Mol Biol 375: 1434-1443

  • DOI: https://doi.org/10.1016/j.jmb.2007.11.071
  • Primary Citation of Related Structures:  
    3BAS, 3BAT

  • PubMed Abstract: 

    The N-terminal region of myosin's rod-like subfragment 2 (S2) joins the two heads of this dimeric molecule and is key to its function. Previously, a crystal structure of this predominantly coiled-coil region was determined for a short fragment (51 residues plus a leucine zipper) of the scallop striated muscle myosin isoform. In that study, the N-terminal 10-14 residues were found to be disordered. We have now determined the structure of the same scallop peptide in three additional crystal environments. In each of two of these structures, improved order has allowed visualization of the entire N-terminus in one chain of the dimeric peptide. We have also compared the melting temperatures of this scallop S2 peptide with those of analogous peptides from three other isoforms. Taken together, these experiments, along with examination of sequences, point to a diminished stability of the N-terminal region of S2 in regulated myosins, compared with those myosins whose regulation is thin filament linked. It seems plain that this isoform-specific instability promotes the off-state conformation of the heads in regulated myosins. We also discuss how myosin isoforms with varied thermal stabilities share the basic capacity to transmit force efficiently in order to produce contraction in their on states.

  • Organizational Affiliation

    Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02454-9110, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin heavy chain, striated muscle/General control protein GCN4 chimera
A, B
89Argopecten irradiansSaccharomyces cerevisiae
This entity is chimeric
Mutation(s): 0 
Gene Names: -/GCN4AAS3ARG9YEL009C
Find proteins for P03069 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P03069 
Go to UniProtKB:  P03069
Find proteins for P24733 (Argopecten irradians)
Explore P24733 
Go to UniProtKB:  P24733
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP03069P24733
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IOD

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 123.335α = 90
b = 44.912β = 95.18
c = 39.878γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-01-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-08-02
    Changes: Source and taxonomy
  • Version 1.3: 2017-10-25
    Changes: Refinement description
  • Version 1.4: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description