Document Detail


Interaction of iron-sulfur flavoprotein with oxygen and hydrogen peroxide.
MedLine Citation:
PMID:  16624489     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The dimeric iron-sulfur flavoprotein (Isf) from Methanosarcina thermophila contains one 4Fe-4S center and one FMN per monomer, and is the prototype of a family widely distributed among strictly anaerobic prokaryotes. Although Isf is able to oxidize ferredoxin, the physiological electron acceptor is unknown; thus, the ability of Isf to reduce O2 and H2O2 was investigated. The product of O2 or H2O2 reduction by Isf was determined to be water. The kinetic parameters of the oxidative half-reactions with O2 and H2O2 as electron acceptors were consistent with a role for Isf in combating oxidative stress. Isf depleted of the 4Fe-4S cluster was unable to oxidize ferredoxin and reduce the FMN cofactor, supporting a role for the cluster in transfer of electrons from ferredoxin to the cofactor. The implications of these properties on the possible function and mechanism of Isf are discussed.
Authors:
Francisco Cruz; James G Ferry
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2006-03-23
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  1760     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-07     Completed Date:  2006-08-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  858-64     Citation Subset:  IM    
Affiliation:
Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16801, USA.
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MeSH Terms
Descriptor/Qualifier:
Electrons
Flavoproteins / metabolism*
Hydrogen Peroxide / metabolism*
Iron-Sulfur Proteins / deficiency,  metabolism*
Kinetics
Oxidation-Reduction
Oxygen / metabolism*
Protein Binding
Spectrophotometry, Ultraviolet
Time Factors
Chemical
Reg. No./Substance:
0/Flavoproteins; 0/Iron-Sulfur Proteins; 7722-84-1/Hydrogen Peroxide; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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