3E2O image
Deposition Date 2008-08-05
Release Date 2008-10-21
Last Version Date 2024-10-30
Entry Detail
PDB ID:
3E2O
Keywords:
Title:
Crystal structure of cytochrome c peroxidase, N184R mutant
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.06 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Cytochrome c peroxidase
Gene (Uniprot):CCP1
Mutations:N184R
Chain IDs:A
Chain Length:294
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
Ligand Molecules
Primary Citation
Engineering ascorbate peroxidase activity into cytochrome c peroxidase.
Biochemistry 47 10324 10332 (2008)
PMID: 18771292 DOI: 10.1021/bi8007565

Abstact

Cytochrome c peroxidase (CCP) and ascorbate peroxidase (APX) have very similar structures, and yet neither CCP nor APX exhibits each other's activities with respect to reducing substrates. APX has a unique substrate binding site near the heme propionates where ascorbate H-bonds with a surface Arg and one heme propionate (Sharp et al. (2003) Nat. Struct. Biol. 10, 303-307). The corresponding region in CCP has a much longer surface loop, and the critical Arg residue that is required for ascorbate binding in APX is Asn in CCP. In order to convert CCP into an APX, the ascorbate-binding loop and critical arginine were engineered into CCP to give the CCP2APX mutant. The mutant crystal structure shows that the engineered site is nearly identical to that found in APX. While wild-type CCP shows no APX activity, CCP2APX catalyzes the peroxidation of ascorbate at a rate of approximately 12 min (-1), indicating that the engineered ascorbate-binding loop can bind ascorbate.

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Primary Citation of related structures