Biosynthesis of the respiratory formate dehydrogenases from Escherichia coli: characterization of the FdhE protein.

Archives of Microbiology
Iris LükeFrank Sargent

Abstract

Escherichia coli can perform two modes of formate metabolism. Under respiratory conditions, two periplasmically-located formate dehydrogenase isoenzymes couple formate oxidation to the generation of a transmembrane electrochemical gradient; and under fermentative conditions a third cytoplasmic isoenzyme is involved in the disproportionation of formate to CO(2) and H(2). The respiratory formate dehydrogenases are redox enzymes that comprise three subunits: a molybdenum cofactor- and FeS cluster-containing catalytic subunit; an electron-transferring ferredoxin; and a membrane-integral cytochrome b. The catalytic subunit and its ferredoxin partner are targeted to the periplasm as a complex by the twin-arginine transport (Tat) pathway. Biosynthesis of these enzymes is under control of an accessory protein termed FdhE. In this study, it is shown that E. coli FdhE interacts with the catalytic subunits of the respiratory formate dehydrogenases. Purification of recombinant FdhE demonstrates the protein is an iron-binding rubredoxin that can adopt monomeric and homodimeric forms. Bacterial two-hybrid analysis suggests the homodimer form of FdhE is stabilized by anaerobiosis. Site-directed mutagenesis shows that conserved cysteine motifs...Continue Reading

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