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J. Bacteriol., Jan 1995, 385-389, Vol 177, No. 2
Copyright © 1995, American Society for Microbiology

Dual mode of energy coupling by the oxyanion-translocating ArsB protein

S Dey and BP Rosen
Department of Biochemistry, Wayne State University School of Medicine, Detroit, Michigan 48201.

The arsA and arsB genes of the ars operon of R-factor R773 confer arsenite resistance in Escherichia coli by coding for an anion- translocating ATPase. Arsenite resistance and the in vivo energetics of arsenite transport were compared in cells expressing the arsA and arsB genes and those expressing just the arsB gene. Cells expressing the arsB gene exhibited intermediate arsenite resistance compared with cells expressing both the arsA and arsB genes. Both types of cells exhibited energy-dependent arsenite exclusion. Exclusion of 73AsO2- from cells expressing only the arsB gene was coupled to electrochemical energy, while in cells expressing both genes, transport was coupled to chemical energy, most likely ATP. These results suggest that the Ars anion transport system can be either an obligatory ATP-coupled primary pump or a secondary carrier coupled to the proton motive force, depending on the subunit composition of the transport complex.


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