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

Experimental Data Snapshot


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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: https://doi.org/10.1016/j.jmb.2004.02.034
  • Primary Citation of Related Structures:  

  • 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. 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.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
863Gallus gallusMutation(s): 0 
Find proteins for P05094 (Gallus gallus)
Explore P05094 
Go to UniProtKB:  P05094
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05094
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Space Group: P 1 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 263.1α = 90
b = 203.7β = 90
c = 100γ = 107.1
EM Software:
TaskSoftware PackageVersion

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
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references, Refinement description