1PXY

Crystal structure of the actin-crosslinking core of Arabidopsis fimbrin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Structure of the actin crosslinking core of fimbrin.

Klein, M.G.Shi, W.Ramagopal, U.Tseng, Y.Wirtz, D.Kovar, D.R.Staiger, C.J.Almo, S.C.

(2004) Structure 12: 999-1013

  • DOI: https://doi.org/10.1016/j.str.2004.04.010
  • Primary Citation of Related Structures:  
    1PXY, 1RT8

  • PubMed Abstract: 

    Filamentous actin is organized into bundles and orthogonal networks by the fimbrin/alpha-actinin superfamily of F-actin crosslinking proteins. The crystal structure of the Arabidopsis thaliana and Schizosaccharomyces pombe fimbrin cores provides the first description of a functional F-actin crosslinking protein and highlights the compact and distinctly asymmetric organization of the fimbrin molecule, in which the two actin binding domains present distinct surfaces to solvent. The mapping of functionally important residues onto the structure affords new insights into the binding process and provides additional constraints which must be accommodated by models for F-actin binding and crosslinking. Most strikingly, this work provides unique insight into the mechanistic features of conditional-lethal mutants and their extragenic suppressors, which highlight conformational and dynamic properties required for fimbrin function. These results underscore the power of jointly considering structural and genetic suppressor data for obtaining unexpected and biologically relevant mechanistic information.


  • Organizational Affiliation

    Department of Biochemistry, Center for Synchrotron Biosciences, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
fimbrin-like protein
A, B
506Arabidopsis thalianaMutation(s): 1 
UniProt
Find proteins for Q7G188 (Arabidopsis thaliana)
Explore Q7G188 
Go to UniProtKB:  Q7G188
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7G188
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.688α = 90
b = 104.981β = 103.93
c = 104.411γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2004-06-22
    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: 2021-02-03
    Changes: Database references, Structure summary
  • Version 1.4: 2021-10-27
    Changes: Database references
  • Version 1.5: 2023-08-16
    Changes: Data collection, Refinement description