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 

wwPDB Validation 3D Report Full Report


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

  • 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 d ...

    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: 
    • 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
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Annexin VI
A
672Homo sapiensMutation(s): 1 
Gene Names: ANXA6 (ANX6)
Find proteins for P08133 (Homo sapiens)
Go to Gene View: ANXA6
Go to UniProtKB:  P08133
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.225 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 67.970α = 90.00
b = 67.970β = 90.00
c = 204.600γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-08-07
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance