Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 33830.41 
• Atom Count: 2390 
• Residue Count: 291 
• Unique protein chains: 1

1CCG

CONSTRUCTION OF A BIS-AQUO HEME ENZYME AND REPLACEMENT WITH EXOGENOUS LIGAND

• DOI: 10.2210/pdb1CCG/pdb

• Classification: OXIDOREDUCTASE(H2O2(A))
• Organism(s): Saccharomyces cerevisiae (strain ATCC 204508 / S288c)


• Deposited: 1994-05-04 Released: 1994-07-31 
• Deposition Author(s): Mcree, D.E., Jensen, G.M., Fitzgerald, M.M., Siegel, H.A., Goodin, D.B.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Work: 0.190 

Literature

Construction of a bisaquo heme enzyme and binding by exogenous ligands.

McRee, D.E., Jensen, G.M., Fitzgerald, M.M., Siegel, H.A., Goodin, D.B.

(1994) Proc.Natl.Acad.Sci.USA 91: 12847-12851

• PubMed: 7809133 
• Primary Citation of Related Structures:  
  1CCE


• PubMed Abstract: 
  

The crystal structure of the His-175-->Gly (H175G) mutant of cytochrome-c peroxidase (EC 1.11.1.5), missing its only heme ligand, reveals that the histidine is replaced by solvent to give a bisaquo heme protein. This protein retains some residual activity, which can be stimulated or inhibited by addition of exogenous ligands. Structural analysis confirms the binding of imidazole to the heme at the position of the wild-type histidine ligand. This imidazole complex reacts readily with hydrogen peroxide to produce a radical species with novel properties. However, reactivation in this complex is incomplete (approximately 5%), which, in view of the very similar structures of the wild-type and the H175G/imidazole forms, implies a critical role for tethering of the axial ligand in catalysis. This study demonstrates the feasibility of constructing heme enzymes with no covalent link to the protein and with unnatural ligand replacements. Such enzymes may prove useful in studies of electron transfer mechanisms and in the engineering of novel heme-based catalysts.

---

Related Citations: 

• The Asp-His-Fe Triad of Cytochrome C Peroxidase Controls the Reduction Potential, Electronic Structure and Coupling of the Tryptophan Free-Radical to the Heme
  Goodin, D.B.,Mcree, D.E.
  (1993) Biochemistry 32: 3313




---

Organizational Affiliation: 

Department of Molecular Biology, Scripps Research Institute, La Jolla, CA 92037.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
CYTOCHROME C PEROXIDASE	A	291	Saccharomyces cerevisiae (strain ATCC 204508 / S288c)	Mutation(s): 0  Gene Names: CCP1 (CCP, CPO) EC: 1.11.1.5
Find proteins for P00431 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Go to UniProtKB:  P00431

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
HEM	A	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
IMD	A	IMIDAZOLE C3 H5 N2 RAXXELZNTBOGNW-UHFFFAOYSA-O

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Work: 0.190 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 105.200	α = 90.00
b = 74.300	β = 90.00
c = 45.400	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	refinement
X-PLOR	phasing
X-PLOR	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1994-05-04 
• Released Date: 1994-07-31 
• Deposition Author(s): Mcree, D.E., Jensen, G.M., Fitzgerald, M.M., Siegel, H.A., Goodin, D.B.

Revision History 

• Version 1.0: 1994-07-31
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-11-29
  Type: Derived calculations, Other