1HCZ

LUMEN-SIDE DOMAIN OF REDUCED CYTOCHROME F AT-35 DEGREES CELSIUS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.158 

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This is version 1.2 of the entry. See complete history


Literature

The heme redox center of chloroplast cytochrome f is linked to a buried five-water chain.

Martinez, S.E.Huang, D.Ponomarev, M.Cramer, W.A.Smith, J.L.

(1996) Protein Sci 5: 1081-1092

  • DOI: 10.1002/pro.5560050610
  • Primary Citation of Related Structures:  
    1HCZ

  • PubMed Abstract: 
  • The crystal structure of the 252-residue lumen-side domain of reduced cytochrome f, a subunit of the proton-pumping integral cytochrome b6f complex of oxygenic photosynthetic membranes, was determined to a resolution of 1.96 A from crystals cooled to -35 degrees ...

    The crystal structure of the 252-residue lumen-side domain of reduced cytochrome f, a subunit of the proton-pumping integral cytochrome b6f complex of oxygenic photosynthetic membranes, was determined to a resolution of 1.96 A from crystals cooled to -35 degrees. The model was refined to an R-factor of 15.8% with a 0.013-A RMS deviation of bond lengths from ideality. Compared to the structure of cytochrome f at 20 degrees, the structure at -35 degrees has a small change in relative orientation of the two folding domains and significantly lower isotropic temperature factors for protein atoms. The structure revealed an L-shaped array of five buried water molecules that extend in two directions from the N delta 1 of the heme ligand His 25. The longer branch extends 11 A within the large domain, toward Lys 66 in the prominent basic patch at the top of the large domain, which has been implicated in the interaction with the electron acceptor, plastocyanin. The water sites are highly occupied, and their temperature factors are comparable to those of protein atoms. Virtually all residues that form hydrogen bonds with the water chain are invariant among 13 known cytochrome f sequences. The water chain has many features that optimize it as a proton wire, including insulation from the protein medium. It is suggested that this chain may function as the lumen-side exit port for proton translocation by the cytochrome b6f complex.


    Related Citations: 
    • Crystal Structure of Chloroplast Cytochrome F Reveals a Novel Cytochrome Fold and Unexpected Heme Ligation
      Martinez, S.E., Huang, D., Szczepaniak, A., Cramer, W.A., Smith, J.L.
      (1994) Structure 2: 95

    Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYTOCHROME F A252Brassica rapaMutation(s): 0 
Find proteins for P36438 (Brassica rapa subsp. rapa)
Explore P36438 
Go to UniProtKB:  P36438
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.158 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.6α = 90
b = 82.2β = 90
c = 45.2γ = 90
Software Package:
Software NamePurpose
TNTrefinement
XDSdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

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