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: 20.0 Å

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 U S A 98: 4361-4366

  • DOI: 10.1073/pnas.071051098
  • Primary Citation of Related Structures:  
    1I84

  • 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
    • 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
    • The Structure of the Head-tail Junction of the Myosin Molecule
      Offer, G., Knight, P.
      (1996) J Mol Biol 256: 407

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SMOOTH MUSCLE MYOSIN HEAVY CHAINSV1184Gallus gallusMutation(s): 0 
Gene Names: MYH11
Find proteins for P10587 (Gallus gallus)
Explore P10587 
Go to UniProtKB:  P10587
Protein Feature View
Expand
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
SMOOTH MUSCLE MYOSIN ESSENTIAL LIGHT CHAINTW150Gallus gallusMutation(s): 0 
Gene Names: MYL6
Find proteins for P02607 (Gallus gallus)
Explore P02607 
Go to UniProtKB:  P02607
Protein Feature View
Expand
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
SMOOTH MUSCLE MYOSIN REGULATORY LIGHT CHAINUZ166Gallus gallusMutation(s): 0 
Gene Names: MYLPF
Find proteins for P02609 (Gallus gallus)
Explore P02609 
Go to UniProtKB:  P02609
Protein Feature View
Expand
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLY
Query on MLY
S,VL-PEPTIDE LINKINGC8 H18 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 20.0 Å
  • Space Group: P 1 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 133α = 90
b = 304β = 90
c = 200γ = 91.5

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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