Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 29657.07 
• Atom Count: 2086 
• Residue Count: 258 
• Unique protein chains: 1

1F1C

CRYSTAL STRUCTURE OF CYTOCHROME C549

• DOI: 10.2210/pdb1F1C/pdb

• Classification: ELECTRON TRANSPORT
• Organism(s): Limnospira maxima


• Deposited: 2000-05-18 Released: 2001-08-08 
• Deposition Author(s): Kerfeld, C.A., Sawaya, M.R., Yeates, T.O., Krogmann, D.W.

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Experimental Data Snapshot

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

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

• PubMed: 11478889 
• Primary Citation of Related Structures:  
  1IGK, 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. 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.

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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




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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
Molecule	Chains	Sequence Length	Organism	Details
CYTOCHROME C549	A, B	129	Limnospira maxima	Mutation(s): 0  Gene Names: psbV
Find proteins for P82603 (Limnospira maxima) Go to UniProtKB:  P82603

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
HEM	A, B	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

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 = 36.500	α = 90.00
b = 84.400	β = 96.50
c = 43.800	γ = 90.00

Software Package:

Software Name	Purpose
EPMR	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-05-18 
• Released Date: 2001-08-08 
• Deposition Author(s): Kerfeld, C.A., Sawaya, M.R., Yeates, T.O., Krogmann, D.W.

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