1EL4

STRUCTURE OF THE CALCIUM-REGULATED PHOTOPROTEIN OBELIN DETERMINED BY SULFUR SAS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Ca2+-regulated photoprotein obelin at 1.7 A resolution determined directly from its sulfur substructure.

Liu, Z.J.Vysotski, E.S.Chen, C.J.Rose, J.P.Lee, J.Wang, B.C.

(2000) Protein Sci. 9: 2085-2093

  • DOI: 10.1110/ps.9.11.2085
  • Also Cited By: 2F8P, 1JF2, 1JF0

  • PubMed Abstract: 
  • The crystal structure of the photoprotein obelin (22.2 kDa) from Obelia longissima has been determined and refined to 1.7 A resolution. Contrary to the prediction of a peroxide, the noncovalently bound substrate, coelenterazine, has only a single oxy ...

    The crystal structure of the photoprotein obelin (22.2 kDa) from Obelia longissima has been determined and refined to 1.7 A resolution. Contrary to the prediction of a peroxide, the noncovalently bound substrate, coelenterazine, has only a single oxygen atom bound at the C2-position. The protein-coelenterazine 2-oxy complex observed in the crystals is photo-active because, in the presence of calcium ion, bioluminescence emission within the crystal is observed. This structure represents only the second de novo protein structure determined using the anomalous scattering signal of the sulfur substructure in the crystal. The method used here is theoretically different from that used for crambin in 1981 (4.72 kDa) and represents a significant advancement in protein crystal structure determination.


    Related Citations: 
    • Preparation and preliminary study of crystals of the recombinant calcium-regulated photoprotein obelin from the bioluminescent hydroid obelia longissima
      Vysotski, E.S.,Liu, Z.J.,Rose, J.,Wang, B.C.,Lee, J.
      (1999) Acta Crystallogr.,Sect.D 55: 1965


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Georgia, Athens 30602, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
OBELIN
A
195Obelia longissimaMutation(s): 0 
Find proteins for Q27709 (Obelia longissima)
Go to UniProtKB:  Q27709
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CTZ
Query on CTZ

Download SDF File 
Download CCD File 
A
C2-HYDROXY-COELENTERAZINE
8-BENZYL-2-HYDROXY-2-(4-HYDROXY-BENZYL)-6-(4-HYDROXY-PHENYL)-2H-IMIDAZO[1,2-A]PYRAZIN-3-ONE
C26 H21 N3 O4
ULLMMKZQNNBLRN-SANMLTNESA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.188 
  • Space Group: P 62
Unit Cell:
Length (Å)Angle (°)
a = 81.562α = 90.00
b = 81.562β = 90.00
c = 86.088γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
SOLVEphasing
ISASphasing
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance