1DK5

CRYSTAL STRUCTURE OF ANNEXIN 24(CA32) FROM CAPSICUM ANNUUM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.216 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Annexin 24 from Capsicum annuum. X-ray structure and biochemical characterization.

Hofmann, A.Proust, J.Dorowski, A.Schantz, R.Huber, R.

(2000) J.Biol.Chem. 275: 8072-8082


  • PubMed Abstract: 
  • This work provides the first three-dimensional structure of a member of the plant annexin family and correlates these findings with biochemical properties of this protein. Annexin 24(Ca32) from Capsicum annuum was purified as a native protein from be ...

    This work provides the first three-dimensional structure of a member of the plant annexin family and correlates these findings with biochemical properties of this protein. Annexin 24(Ca32) from Capsicum annuum was purified as a native protein from bell pepper and was also prepared by recombinant techniques. To overcome the problem of precipitation of the recombinant wild-type protein in crystallization trials, two mutants were designed. Whereas an N-terminal truncation mutant turned out to be an unstable protein, the N-terminal His-tagged annexin 24(Ca32) was crystallized, and the three-dimensional structure was determined by x-ray diffraction at 2. 8 A resolution. The structure refined to an R-factor of 0.216 adopts the typical annexin fold; the detailed structure, however, is different from non-plant annexins, especially in domains I and III and in the membrane binding loops on the convex side. Within the unit cell there are two molecules per asymmetric unit, which differ in conformation of the IAB-loop. Both conformers show Trp-35 on the surface. The loop-out conformation is stabilized by tight interactions of this tryptophan with residue side chains of a symmetry-related molecule and enforced by a bound sulfate. Characterization of this plant annexin using biophysical methods revealed calcium-dependent binding to phospholipid vesicles with preference for phosphatidylcholine over phosphatidylserine and magnesium-dependent phosphodiesterase activity in vitro as shown with adenosine triphosphate as the substrate. A comparative unfolding study of recombinant annexin 24(Ca32) wild type and of the His-tag fusion protein indicates higher stability of the latter. The effect of this N-terminal modification is also visible from CD spectra. Both proteins were subjected to a FURA-2-based calcium influx assay, which gave high influx rates for the wild-type but greatly reduced influx rates for the fusion protein. We therefore conclude that the N-terminal domain is indeed a major regulatory element modulating different annexin properties by allosteric mechanisms.


    Related Citations: 
    • Characterization and Gene Expression of an Annexin During Fruit Development in Capsicum annuum
      Proust, J.,Houlne, G.,Schantz, M.L.,Schantz, R.
      (1996) FEBS Lett. 383: 208


    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Abt. Strukturforschung, 82152 Martinsried, Germany. hofmanna@ncifcrf.gov




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANNEXIN 24(CA32)
A, B
322Capsicum annuumMutation(s): 0 
Find proteins for Q42657 (Capsicum annuum)
Go to UniProtKB:  Q42657
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.216 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 96.760α = 90.00
b = 96.760β = 90.00
c = 173.390γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
CNSrefinement
CCP4data scaling
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-12-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-12-20
    Type: Database references
  • Version 1.4: 2018-01-31
    Type: Experimental preparation