1F1C

CRYSTAL STRUCTURE OF CYTOCHROME C549

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.237 

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This is version 2.0 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

  • DOI: 10.1021/bi002679p
  • Primary Citation of Related Structures:  
    1F1C, 1F1F

  • 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 very different functional roles, underscored by the large difference between their midpoint potentials of nearly 600 mV ...

    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: 
    • The Low-Potential Cytochrome C of Cyanobacteria and Algae
      Krogmann, D.W.
      (1991) Biochim Biophys Acta 1058: 35
    • Characterization of Cytochrome c-550 from Cyanobacteria
      Alam, J., Sprinkle, J., Hermodson, M.A., Krogmann, D.W.
      (1984) Biochim Biophys Acta 766: 317
    Organizational Affiliation: 

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYTOCHROME C549A, B129Limnospira maximaMutation(s): 0 
Gene Names: psbV
UniProt
Find proteins for P82603 (Limnospira maxima)
Explore P82603 
Go to UniProtKB:  P82603
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP82603
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEC
Query on HEC
Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]		HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.237 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.5α = 90
b = 84.4β = 96.5
c = 43.8γ = 90
Software Package:
Software NamePurpose
EPMRphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-08-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2021-03-03
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary