1EJ3

CRYSTAL STRUCTURE OF AEQUORIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of the photoprotein aequorin at 2.3 A resolution.

Head, J.F.Inouye, S.Teranishi, K.Shimomura, O.

(2000) Nature 405: 372-376

  • DOI: 10.1038/35012659

  • PubMed Abstract: 
  • Aequorin is a calcium-sensitive photoprotein originally obtained from the jellyfish Aequorea aequorea. Because it has a high sensitivity to calcium ions and is biologically harmless, aequorin is widely used as a probe to monitor intracellular levels ...

    Aequorin is a calcium-sensitive photoprotein originally obtained from the jellyfish Aequorea aequorea. Because it has a high sensitivity to calcium ions and is biologically harmless, aequorin is widely used as a probe to monitor intracellular levels of free calcium. The aequorin molecule contains four helix-loop-helix 'EF-hand' domains, of which three can bind calcium. The molecule also contains coelenterazine as its chromophoric ligand. When calcium is added, the protein complex decomposes into apoaequorin, coelenteramide and CO2, accompanied by the emission of light. Apoaequorin can be regenerated into active aequorin in the absence of calcium by incubation with coelenterazine, oxygen and a thiol agent. Cloning and expression of the complementary DNA for aequorin were first reported in 1985 (refs 2, 6), and growth of crystals of the recombinant protein has been described; however, techniques have only recently been developed to prepare recombinant aequorin of the highest purity, permitting a full crystallographic study. Here we report the structure of recombinant aequorin determined by X-ray crystallography. Aequorin is found to be a globular molecule containing a hydrophobic core cavity that accommodates the ligand coelenterazine-2-hydroperoxide. The structure shows protein components stabilizing the peroxide and suggests a mechanism by which calcium activation may occur.


    Organizational Affiliation

    Department of Physiology, Boston University School of Medicine, Massachusetts 02118, USA. jfh@medxtal.bu.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AEQUORIN
A, B
191Aequorea victoriaMutation(s): 0 
Find proteins for P02592 (Aequorea victoria)
Go to UniProtKB:  P02592
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CZH
Query on CZH

Download SDF File 
Download CCD File 
A, B
C2-HYDROPEROXY-COELENTERAZINE
8-BENZYL-2-HYDROPEROXY-2-(4-HYDROXY-BENZYL)-6-(4-HYDROXY-PHENYL)-2H-IMIDAZO[1,2-A]PYRAZIN-3-ONE
C26 H21 N3 O5
HOSWCJDTHOAORT-SANMLTNESA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.219 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 81.270α = 90.00
b = 81.270β = 90.00
c = 163.660γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-05-31
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance