Crystal Structure Of Phosphorylation-Mimicking Mutant T356D Of Annexin VI

Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.243 

wwPDB Validation   3D Report Full Report

This is version 1.5 of the entry. See complete history


Structural and Dynamic Changes in Human Annexin VI Induced by a Phosphorylation-Mimicking Mutation, T356D

Freye-Minks, C.Kretsinger, R.H.Creutz, C.E.

(2003) Biochemistry 42: 620-630

  • DOI: https://doi.org/10.1021/bi026742h
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Phosphorylation of some members of the annexin family of proteins may play a significant role in controlling their calcium-dependent interactions with membranes. Recent electron microscopic studies of annexin VI revealed that the protein's two core domains exhibit a great degree of flexibility and are able to undergo a relative conformational change that could potentially initiate contacts between membranes [Avila-Sakar, A. J., et al. (2000) J. Struct. Biol. 130, 54-62]. To assess the possibility of a regulatory role of phosphorylation in this behavior, the crystal structure of a phosphorylation-mimicking mutant (T356D in the flexible connector region of human annexin VI) was determined to 2.65 A resolution. When the mutant is compared to the wild-type annexin VI, subtle differences are seen at the site of the mutation, while larger changes are evident in one of the calcium-binding loops and in the presence of five calcium ions. Furthermore, biochemical studies provide evidence for additional conformational differences between the T356D and wild-type solution structures. Fluorescence emission and acrylamide quenching suggest a higher level of solvent exposure of Trp-343 in the connector region of T356D in the presence of calcium. Comparisons of retardation coefficients in native gel electrophoresis reveal that T356D has a more extended shape, while proteolytic studies show a greater accessibility of a trypsin cleavage site inside the linker region, indicating a conformation more open than the wild-type form. These data provide insights into a possible regulatory mechanism leading to a higher degree of flexibility and possibly a higher calcium binding affinity of annexin VI upon phosphorylation.

  • Organizational Affiliation

    Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908, USA. cf9c@virginia.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Annexin VI672Homo sapiensMutation(s): 1 
Gene Names: ANX6
UniProt & NIH Common Fund Data Resources
Find proteins for P08133 (Homo sapiens)
Explore P08133 
Go to UniProtKB:  P08133
PHAROS:  P08133
GTEx:  ENSG00000197043 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08133
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.65 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.243 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.97α = 90
b = 67.97β = 90
c = 204.6γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-07
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2024-02-14
    Changes: Data collection
  • Version 1.5: 2024-04-03
    Changes: Refinement description