1SJJ

Cryo-EM Structure of Chicken Gizzard Smooth Muscle alpha-Actinin


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A 3-D Reconstruction of Smooth Muscle alpha-Actinin by CryoEm Reveals Two Different Conformations at the Actin-binding Region.

Liu, J.Taylor, D.W.Taylor, K.A.

(2004) J Mol Biol 338: 115-125

  • DOI: 10.1016/j.jmb.2004.02.034
  • Primary Citation of Related Structures:  
    1SJJ

  • PubMed Abstract: 
  • Cryoelectron microscopy was used to obtain a 3-D image at 2.0 nm resolution of 2-D arrays of smooth muscle alpha-actinin. The reconstruction reveals a well-resolved long central domain with 90 degrees of left-handed twist and near 2-fold symmetry. However, the molecular ends which contain the actin binding and calmodulin-like domains, have different structures oriented approximately 90 degrees to each other ...

    Cryoelectron microscopy was used to obtain a 3-D image at 2.0 nm resolution of 2-D arrays of smooth muscle alpha-actinin. The reconstruction reveals a well-resolved long central domain with 90 degrees of left-handed twist and near 2-fold symmetry. However, the molecular ends which contain the actin binding and calmodulin-like domains, have different structures oriented approximately 90 degrees to each other. Atomic structures for the alpha-actinin domains were built by homology modeling and assembled into an atomic model. Model building suggests that in the 2-D arrays, the two calponin homology domains that comprise the actin-binding domain have a closed conformation at one end and an open conformation at the other end due to domain swapping. The open and closed conformations of the actin-binding domain suggests flexibility that may underlie Ca2+ regulation. The approximately 90 degrees orientation difference at the molecular ends may underlie alpha-actinin's ability to crosslink actin filaments in nearly any orientation.


    Related Citations: 
    • Projection image of smooth muscle alpha-actinin from two-dimensional crystals formed on positively charged lipid layers
      Taylor, K.A., Taylor, D.W.
      (1993) J Mol Biol 230: 196
    • The three-dimensional structure of alpha-actinin obtained by cryoelectron microscopy suggests a model for Ca(2+)-dependent actin binding
      Tang, J., Taylor, D.W., Taylor, K.A.
      (2001) J Mol Biol 310: 845
    • Isoforms of alpha-actinin from cardiac, smooth and skeletal muscle form polar arrays of actin filaments
      Taylor, K.A., Taylor, D.W., Schachat, F.
      (2000) J Cell Biol 149: 635

    Organizational Affiliation

    Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306-4380, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
actininA, B863Gallus gallusMutation(s): 0 
Gene Names: ACTN1
UniProt
Find proteins for P05094 (Gallus gallus)
Explore P05094 
Go to UniProtKB:  P05094
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Space Group: P 1 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 263.1α = 90
b = 203.7β = 90
c = 100γ = 107.1

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-03-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-07-18
    Changes: Author supporting evidence, Data collection