1M9I

Crystal Structure Of Phosphorylation-Mimicking Mutant T356D Of Annexin VI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.243 

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This is version 1.2 of the entry. See complete history


Literature

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: 10.1021/bi026742h
  • Primary Citation of Related Structures:  
    1M9I

  • 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 ...

    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.


    Related Citations: 
    • The structure of recombinant human annexin VI in crystals and membrane-bound
      Benz, J., Bergner, A., Hofmann, A., Demange, P., Gottig, P., Liemann, S., Huber, R., Voges, D.
      (1996) J Mol Biol 260: 638
    • Crystal structure of bovine annexin VI in a calcium-bound state
      Avila-Sakar, A.J., Creutz, C.E., Kretsinger, R.H.
      (1998) Biochim Biophys Acta 1387: 103

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Annexin VIA672Homo sapiensMutation(s): 1 
Gene Names: ANX6ANXA6
UniProt & NIH Common Fund Data Resources
Find proteins for P08133 (Homo sapiens)
Explore P08133 
Go to UniProtKB:  P08133
PHAROS:  P08133
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
CNSrefinement
HKL-2000data reduction
CNSphasing

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