2FXO

Structure of the human beta-myosin S2 fragment


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.273 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structures of human cardiac {beta}-myosin II S2-{Delta} provide insight into the functional role of the S2 subfragment

Blankenfeldt, W.Thoma, N.H.Wray, J.S.Gautel, M.Schlichting, I.

(2006) Proc.Natl.Acad.Sci.Usa 103: 17713-17717

  • DOI: 10.1073/pnas.0606741103
  • Primary Citation of Related Structures:  
  • Also Cited By: 3JAX, 3DTP, 3BAT, 3BAS

  • PubMed Abstract: 
  • Myosin II is the major component of the muscle thick filament. It consists of two N-terminal S1 subfragments ("heads") connected to a long dimeric coiled-coil rod. The rod is in itself twofold symmetric, but in the filament, the two heads point away ...

    Myosin II is the major component of the muscle thick filament. It consists of two N-terminal S1 subfragments ("heads") connected to a long dimeric coiled-coil rod. The rod is in itself twofold symmetric, but in the filament, the two heads point away from the filament surface and are therefore not equivalent. This breaking of symmetry requires the initial section of the rod, subfragment 2 (S2), to be relatively flexible. S2 is an important functional element, involved in various mechanisms by which the activity of smooth and striated muscle is regulated. We have determined crystal structures of the 126 N-terminal residues of S2 from human cardiac beta-myosin II (S2-Delta), of both WT and the disease-associated E924K mutant. S2-Delta is a straight parallel dimeric coiled coil, but the N terminus of one chain is disordered in WT-S2-Delta due to crystal contacts, indicative of unstable local structure. Bulky noncanonical side chains pack into a/d positions of S2-Delta's N terminus, leading to defined local asymmetry and axial stagger, which could induce nonequivalence of the S1 subfragments. Additionally, S2 possesses a conserved charge distribution with three prominent rings of negative potential within S2-Delta, the first of which may provide a binding interface for the "blocked head" of smooth muscle myosin in the OFF state. The observation that many disease-associated mutations affect the second negatively charged ring further suggests that charge interactions play an important role in regulation of cardiac muscle activity through myosin-binding protein C.


    Related Citations: 
    • Mutations in Beta-Myosin S2 that Cause Familial Hypertrophic Cardiomyopathy (Fhc) Abolish the Interaction with the Regulatory Domain of Myosin-Binding Protein-C
      Gruen, M.,Gautel, M.
      (1999) J.Mol.Biol. 286: 933
    • Visualization of an Unstable Coiled Coil from the Scallop Myosin Rod
      Li, Y.,Brown, J.H.,Reshetnikova, L.,Blazsek, A.,Farkas, L.,Nyitray, L.,Cohen, C.
      (2003) Nature 424: 341


    Organizational Affiliation

    Max Planck Institute of Molecular Physiology, Department of Physical Biochemistry, 44227 Dortmund, Germany. wulf.blankenfeldt@mpi-dortmund.mpg.de




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin heavy chain, cardiac muscle beta isoform
A, B, C, D
129Homo sapiensMutation(s): 1 
Gene Names: MYH7 (MYHCB)
Find proteins for P12883 (Homo sapiens)
Go to Gene View: MYH7
Go to UniProtKB:  P12883
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.273 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 40.157α = 91.11
b = 41.867β = 92.73
c = 97.795γ = 107.18
Software Package:
Software NamePurpose
XDSdata reduction
REFMACrefinement
MOLEMAN2phasing
SHELXDphasing
MOLEMAN2model building
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Advisory, Refinement description