1ZZH

Structure of the fully oxidized di-heme cytochrome c peroxidase from R. capsulatus

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.253 

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Literature

Structural and mutagenesis studies on the cytochrome c peroxidase from Rhodobacter capsulatus provide new insights into structure-function relationships of bacterial di-heme peroxidases

De Smet, L., Savvides, S.N., Van Horen, E., Pettigrew, G., Van Beeumen, J.J.

(2006) J Biol Chem 281: 4371-4379

  • DOI: 10.1074/jbc.M509582200
  • Primary Citation of Related Structures:  
    1ZZH

  • PubMed Abstract: 

    • Cytochrome c peroxidases (CCP) play a key role in cellular detoxification by catalyzing the reduction of hydrogen peroxide to water. The di-heme CCP from Rhodobacter capsulatus is the fastest enzyme (1060 s(-1)), when tested with its physiological cytochrome c substrate, among all di-heme CCPs characterized to date and has, therefore, been an attractive target to investigate structure-function relationships for this family of enzymes ...

    Cytochrome c peroxidases (CCP) play a key role in cellular detoxification by catalyzing the reduction of hydrogen peroxide to water. The di-heme CCP from Rhodobacter capsulatus is the fastest enzyme (1060 s(-1)), when tested with its physiological cytochrome c substrate, among all di-heme CCPs characterized to date and has, therefore, been an attractive target to investigate structure-function relationships for this family of enzymes. Here, we combine for the first time structural studies with site-directed mutagenesis and spectroscopic studies of the mutant enzymes to investigate the roles of amino acid residues that have previously been suggested to be important for activity. The crystal structure of R. capsulatus at 2.7 Angstroms in the fully oxidized state confirms the overall molecular scaffold seen in other di-heme CCPs but further reveals that a segment of about 10 amino acids near the peroxide binding site is disordered in all four molecules in the asymmetric unit of the crystal. Structural and sequence comparisons with other structurally characterized CCPs suggest that flexibility in this part of the molecular scaffold is an inherent molecular property of the R. capsulatus CCP and of CCPs in general and that it correlates with the levels of activity seen in CCPs characterized, thus, far. Mutagenesis studies support the spin switch model and the roles that Met-118, Glu-117, and Trp-97 play in this model. Our results help to clarify a number of aspects of the debate on structure-function relationships in this family of bacterial CCPs and set the stage for future studies.

    Organizational Affiliation: 

    Department of Biochemistry, Physiology and Microbiology, Laboratory for Protein Biochemistry and Protein Engineering, Ghent University, Belgium.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
cytochrome c peroxidaseA, B, C, D328Rhodobacter capsulatusMutation(s): 0 
EC: 1.11.1.5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEC
Query on HEC
Download Ideal Coordinates CCD File 
H [auth A],
I [auth A],
O [auth B],
P [auth B],
S [auth C],
H [auth A],
I [auth A],
O [auth B],
P [auth B],
S [auth C],
T [auth C],
W [auth D],
X [auth D]
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
K [auth B],
L [auth B],
M [auth B],
F [auth A],
G [auth A],
K [auth B],
L [auth B],
M [auth B],
N [auth B],
R [auth C],
V [auth D]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
E [auth A],
J [auth B],
Q [auth C],
U [auth D]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.253 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.63α = 90
b = 132.47β = 90
c = 163.94γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-29
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance