1WZF

Crystal Structure Of An Artificial Metalloprotein: Fe(10-COOH-Salophen)/Wild Type Heme oxygenase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Design of metal cofactors activated by a protein-protein electron transfer system.

Ueno, T.Yokoi, N.Unno, M.Matsui, T.Tokita, Y.Yamada, M.Ikeda-Saito, M.Nakajima, H.Watanabe, Y.

(2006) Proc.Natl.Acad.Sci.Usa 103: 9416-9421

  • DOI: 10.1073/pnas.0510968103
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Protein-to-protein electron transfer (ET) is a critical process in biological chemistry for which fundamental understanding is expected to provide a wealth of applications in biotechnology. Investigations of protein-protein ET systems in reductive ac ...

    Protein-to-protein electron transfer (ET) is a critical process in biological chemistry for which fundamental understanding is expected to provide a wealth of applications in biotechnology. Investigations of protein-protein ET systems in reductive activation of artificial cofactors introduced into proteins remains particularly challenging because of the complexity of interactions between the cofactor and the system contributing to ET. In this work, we construct an artificial protein-protein ET system, using heme oxygenase (HO), which is known to catalyze the conversion of heme to biliverdin. HO uses electrons provided from NADPH/cytochrome P450 reductase (CPR) through protein-protein complex formation during the enzymatic reaction. We report that a Fe(III)(Schiff-base), in the place of the active-site heme prosthetic group of HO, can be reduced by NADPH/CPR. The crystal structure of the Fe(10-CH(2)CH(2)COOH-Schiff-base).HO composite indicates the presence of a hydrogen bond between the propionic acid carboxyl group and Arg-177 of HO. Furthermore, the ET rate from NADPH/CPR to the composite is 3.5-fold faster than that of Fe(Schiff-base).HO, although the redox potential of Fe(10-CH(2)CH(2)COOH-Schiff-base).HO (-79 mV vs. NHE) is lower than that of Fe(Schiff-base).HO (+15 mV vs. NHE), where NHE is normal hydrogen electrode. This work describes a synthetic metal complex activated by means of a protein-protein ET system, which has not previously been reported. Moreover, the result suggests the importance of the hydrogen bond for the ET reaction of HO. Our Fe(Schiff-base).HO composite model system may provide insights with regard to design of ET biosystems for sensors, catalysts, and electronics devices.


    Organizational Affiliation

    Research Center for Materials Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heme oxygenase
A, B
215Corynebacterium diphtheriae (strain ATCC 700971 / NCTC 13129 / Biotype gravis)Mutation(s): 0 
Gene Names: hmuO
EC: 1.14.14.18
Find proteins for P71119 (Corynebacterium diphtheriae (strain ATCC 700971 / NCTC 13129 / Biotype gravis))
Go to UniProtKB:  P71119
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
YOL
Query on YOL

Download SDF File 
Download CCD File 
A, B
[[2,2'-[4-CARBOXY-1,2-PHENYLENEBIS(NITRILOMETHYLIDYNE)]BIS[PHENOLATO]](2-)-N,N',O,O']-IRON
SALOPHEN-10-CARBOXYLATE IRON CHELATE
C21 H14 Fe N2 O4
AYPNHSRYHHHKFU-HPUGBGFMSA-L
 Ligand Interaction
SO4
Query on SO4

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Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.182 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 40.810α = 90.00
b = 62.875β = 97.93
c = 77.693γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-02-21
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance