1F1C

CRYSTAL STRUCTURE OF CYTOCHROME C549


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structures of cytochrome c-549 and cytochrome c6 from the cyanobacterium Arthrospira maxima.

Sawaya, M.R.Krogmann, D.W.Serag, A.Ho, K.K.Yeates, T.O.Kerfeld, C.A.

(2001) Biochemistry 40: 9215-9225

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cytochrome c(6) and cytochrome c-549 are small (89 and 130 amino acids, respectively) monoheme cytochromes that function in photosynthesis. They appear to have descended relatively recently from the same ancestral gene but have diverged to carry out ...

    Cytochrome c(6) and cytochrome c-549 are small (89 and 130 amino acids, respectively) monoheme cytochromes that function in photosynthesis. They appear to have descended relatively recently from the same ancestral gene but have diverged to carry out very different functional roles, underscored by the large difference between their midpoint potentials of nearly 600 mV. We have determined the X-ray crystal structures of both proteins isolated from the cyanobacterium Arthrospira maxima. The two structures are remarkably similar, superimposing on backbone atoms with an rmsd of 0.7 A. Comparison of the two structures suggests that differences in solvent exposure of the heme and the electrostatic environment of the heme propionates, as well as in heme iron ligation, are the main determinants of midpoint potential in the two proteins. In addition, the crystal packing of both A. maxima cytochrome c-549 and cytochrome c(6) suggests that the proteins oligomerize. Finally, the cytochrome c-549 dimer we observe can be readily fit into the recently described model of cyanobacterial photosystem II.


    Related Citations: 
    • Characterization of Cytochrome c-550 from Cyanobacteria
      Alam, J.,Sprinkle, J.,Hermodson, M.A.,Krogmann, D.W.
      (1984) BIOCHIM.BIOPHYS.ACTA 766: 317
    • The Low-Potential Cytochrome C of Cyanobacteria and Algae
      Krogmann, D.W.
      (1991) BIOCHIM.BIOPHYS.ACTA 1058: 35


    Organizational Affiliation

    Molecular Biology Institute, University of California, Los Angeles, Box 951570, Los Angeles, California 90095-1570, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYTOCHROME C549
A, B
129Limnospira maximaMutation(s): 0 
Gene Names: psbV
Find proteins for P82603 (Limnospira maxima)
Go to UniProtKB:  P82603
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.217 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 36.500α = 90.00
b = 84.400β = 96.50
c = 43.800γ = 90.00
Software Package:
Software NamePurpose
EPMRphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-08-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance