title: Three iron-sulfur proteins encoded by three ORFs in chloroplasts and cyanobacteria.
abstract: A brief review is presented on the gene products of frxA, frxB and frxC found in chloroplasts. The product of frxA shows high sequence homologies to bacterial 2[4Fe-4S] ferredoxins, but it functions as iron-sulfur centers A and B in Photosystem I, transferring electrons to [2Fe-2S] ferredoxin. This protein is located on surface of the thylakoid membranes in a state being covered by two other proteins. Proteins homologous to frxB product are found in mitochondrial respiratory Complex I and the product of frxB may function in chlororespiration, but at present no clear function of this protein is known. The frxC gene product is found to function in light-independent chlorophyll synthesis as one of the subunits of protochlorophyllide reductase and is reviewed in comparison to nitrogenase. Several problems and future research direction in these areas are also presented.
authors.affiliation: Department of Biochemistry, Faculty of Science, Okayama University of Science, 700, Okayama, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Matsubara
authors.forename: H
authors.initials: H
authors.lastname: Oh-Oka
authors.forename: Y
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Y
authors.initials: Y
authors.lastname: Fujita