1JER

CUCUMBER STELLACYANIN, CU2+, PH 7.0


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A missing link in cupredoxins: crystal structure of cucumber stellacyanin at 1.6 A resolution.

Hart, P.J.Nersissian, A.M.Herrmann, R.G.Nalbandyan, R.M.Valentine, J.S.Eisenberg, D.

(1996) Protein Sci. 5: 2175-2183

  • DOI: 10.1002/pro.5560051104

  • PubMed Abstract: 
  • Stellacyanins are blue (type I) copper glycoproteins that differ from other members of the cupredoxin family in their spectroscopic and electron transfer properties. Until now, stellacyanins have eluded structure determination. Here we report the thr ...

    Stellacyanins are blue (type I) copper glycoproteins that differ from other members of the cupredoxin family in their spectroscopic and electron transfer properties. Until now, stellacyanins have eluded structure determination. Here we report the three-dimensional crystal structure of the 109 amino acid, non-glycosylated copper binding domain of recombinant cucumber stellacyanin refined to 1.6 A resolution. The crystallographic R-value for all 18,488 reflections (sigma > 0) between 50-1.6 A is 0.195. The overall fold is organized in two beta-sheets, both with four beta-stands. Two alpha-helices are found in loop regions between beta-strands. The beta-sheets form a beta-sandwich similar to those found in other cupredoxins, but some features differ from proteins such as plastocyanin and azurin in that the beta-barrel is more flattened, there is an extra N-terminal alpha-helix, and the copper binding site is much more solvent accessible. The presence of a disulfide bond at the copper binding end of the protein confirms that cucumber stellacyanin has a phytocyanin-like fold. The ligands to copper are two histidines, one cysteine, and one glutamine, the latter replacing the methionine typically found in mononuclear blue copper proteins. The Cu-Gln bond is one of the shortest axial ligand bond distances observed to date in structurally characterized type I copper proteins. The characteristic spectroscopic properties and electron transfer reactivity of stellacyanin, which differ significantly from those of other well-characterized cupredoxins, can be explained by its more exposed copper site, its distinctive amino acid ligand composition, and its nearly tetrahedral ligand geometry. Surface features on the cucumber stellacyanin molecule that could be involved in interactions with putative redox partners are discussed.


    Related Citations: 
    • Cloning, Expression, and Spectroscopic Characterization of Cucumis Sativus Stellacyanin in its Non-Glycosylated Form
      Nersissian, A.M.,Mehrabian, Z.B.,Nalbandyan, R.M.,Hart, P.J.,Fraczkiewicz, G.,Czernuszewicz, R.S.,Bender, C.J.,Peisach, J.,Herrmann, R.G.,Valentine, J.S.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    UCLA-DOE Laboratory of Structural Biology and Molecular Medicine, University of California 90095, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CUCUMBER STELLACYANIN
A
138Cucumis sativusN/A
Find proteins for P29602 (Cucumis sativus)
Go to UniProtKB:  P29602
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CU
Query on CU

Download SDF File 
Download CCD File 
A
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.237 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 59.180α = 90.00
b = 59.180β = 90.00
c = 74.210γ = 120.00
Software Package:
Software NamePurpose
SHELXL-93phasing
SHELXL-93refinement
SHELXL-93model building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-02-12
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance