1I84

CRYO-EM STRUCTURE OF THE HEAVY MEROMYOSIN SUBFRAGMENT OF CHICKEN GIZZARD SMOOTH MUSCLE MYOSIN WITH REGULATORY LIGHT CHAIN IN THE DEPHOSPHORYLATED STATE. ONLY C ALPHAS PROVIDED FOR REGULATORY LIGHT CHAIN. ONLY BACKBONE ATOMS PROVIDED FOR S2 FRAGMENT.


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 20 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional image reconstruction of dephosphorylated smooth muscle heavy meromyosin reveals asymmetry in the interaction between myosin heads and placement of subfragment 2.

Wendt, T.Taylor, D.Trybus, K.M.Taylor, K.

(2001) Proc.Natl.Acad.Sci.USA 98: 4361-4366

  • DOI: 10.1073/pnas.071051098

  • PubMed Abstract: 
  • Regulation of the actin-activated ATPase of smooth muscle myosin II is known to involve an interaction between the two heads that is controlled by phosphorylation of the regulatory light chain. However, the three-dimensional structure of this inactiv ...

    Regulation of the actin-activated ATPase of smooth muscle myosin II is known to involve an interaction between the two heads that is controlled by phosphorylation of the regulatory light chain. However, the three-dimensional structure of this inactivated form has been unknown. We have used a lipid monolayer to obtain two-dimensional crystalline arrays of the unphosphorylated inactive form of smooth muscle heavy meromyosin suitable for structural studies by electron cryomicroscopy of unstained, frozen-hydrated specimens. The three-dimensional structure reveals an asymmetric interaction between the two myosin heads. The ATPase activity of one head is sterically "blocked" because part of its actin-binding interface is positioned onto the converter domain of the second head. ATPase activity of the second head, which can bind actin, appears to be inhibited through stabilization of converter domain movements needed to release phosphate and achieve strong actin binding. When the subfragment 2 domain of heavy meromyosin is oriented as it would be in an actomyosin filament lattice, the position of the heads is very different from that needed to bind actin, suggesting an additional contribution to ATPase inhibition in situ.


    Related Citations: 
    • Visualization of Head-head Interactions in the Inhibited State of Smooth Muscle Myosin
      Wendt, T.,Taylor, D.,Messier, T.,Trybus, K.M.,Taylor, K.A.
      (1999) J.Cell Biol. 147: 1385
    • Crystal Structure of a Vertebrate Smooth Muscle Myosin Motor Domain and its Complex with the Essential Light Chain: Visualization of the Pre-power Stroke State
      Dominguez, R.,Freyzon, Y.,Trybus, K.M.,Cohen, C.
      (1998) Cell 94: 559
    • The Structure of the Head-tail Junction of the Myosin Molecule
      Offer, G.,Knight, P.
      (1996) J.Mol.Biol. 256: 407
    • Three-dimensional Structure of Myosin Subfragment-1: a Molecular Motor
      Rayment, I.,Rypniewsky, W.R.,Schmidt-Base, K.,Smith, R.,Tomchick, D.R.,Benning, M.M.,Winkelmann, D.A.,Wesenberg, G.,Holden, H.M.
      (1993) Science 261: 50


    Organizational Affiliation

    Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SMOOTH MUSCLE MYOSIN HEAVY CHAIN
S, V
1184Gallus gallusGene Names: MYH11
Find proteins for P10587 (Gallus gallus)
Go to Gene View: MYH11
Go to UniProtKB:  P10587
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SMOOTH MUSCLE MYOSIN ESSENTIAL LIGHT CHAIN
T, W
150Gallus gallusGene Names: MYL6
Find proteins for P02607 (Gallus gallus)
Go to Gene View: MYL6
Go to UniProtKB:  P02607
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SMOOTH MUSCLE MYOSIN REGULATORY LIGHT CHAIN
U, Z
166Gallus gallusGene Names: MYLPF
Find proteins for P02609 (Gallus gallus)
Go to Gene View: MYLPF
Go to UniProtKB:  P02609
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLY
Query on MLY
S, V
L-PEPTIDE LINKINGC8 H18 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 20 Å
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance