2BZ7

Oxidized and reduced structures of a mutant Plastocyanin of fern


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Protonation of a Histidine Copper Ligand in Fern Plastocyanin.

Hulsker, R.Mery, A.Thomassen, E.A.J.Ranieri, A.Sola, M.Verbeet, M.P.Kohzuma, T.Ubbink, M.

(2007) J.Am.Chem.Soc. 129: 4423

  • DOI: 10.1021/ja0690464
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Plastocyanin is a small blue copper protein that shuttles electrons as part of the photosynthetic redox chain. Its redox behavior is changed at low pH as a result of protonation of the solvent-exposed copper-coordinating histidine. Protonation and su ...

    Plastocyanin is a small blue copper protein that shuttles electrons as part of the photosynthetic redox chain. Its redox behavior is changed at low pH as a result of protonation of the solvent-exposed copper-coordinating histidine. Protonation and subsequent redox inactivation could have a role in the down regulation of photosynthesis. As opposed to plastocyanin from other sources, in fern plastocyanin His90 protonation at low pH has been reported not to occur. Two possible reasons for that have been proposed: pi-pi stacking between Phe12 and His90 and lack of a hydrogen bond with the backbone oxygen of Gly36. We have produced this fern plastocyanin recombinantly and examined the properties of wild-type protein and mutants Phe12Leu, Gly36Pro, and the double mutant with NMR spectroscopy, X-ray crystallography, and cyclic voltammetry. The results demonstrate that, contrary to earlier reports, protonation of His90 in the wild-type protein does occur in solution with a pKa of 4.4 (+/-0.1). Neither the single mutants nor the double mutant exhibit a change in protonation behavior, indicating that the suggested interactions have no influence. The crystal structure at low pH of the Gly36Pro variant does not show His90 protonation, similar to what was found for the wild-type protein. The structure suggests that movement of the imidazole ring is hindered by crystal contacts. This study illustrates a significant difference between results obtained in solution by NMR and by crystallography.


    Related Citations: 
    • Structure Comparison between Oxidized and Reduced Plastocyanin from a Fer, Dryopteris Crassirhizoma
      Inoue, T.,Gotowda, M.,Sugawara, H.,Kohzuma, T.,Yoshizaki, F.,Sugimura, Y.,Kai, Y.
      (1999) Biochemistry 38: 13853


    Organizational Affiliation

    Leiden Institute of Chemistry, Leiden University, Gorlaeus Laboratories, P.O. Box 9502, 2300 RA, Leiden, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PLASTOCYANIN
A
102Dryopteris crassirhizomaMutation(s): 1 
Gene Names: PETE
Find proteins for Q7SIB8 (Dryopteris crassirhizoma)
Go to UniProtKB:  Q7SIB8
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: 1.76 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.191 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 72.921α = 90.00
b = 72.921β = 90.00
c = 29.530γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
MOLREPphasing
REFMACrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-11-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance