A functional chimeric membrane subunit of an ion-translocating ATPase.
A chimeric transport protein was made by expression of a fusion of the arsB genes from Escherichia coli plasmid R773 and Staphylococcus aureus plasmid pI258. The two genes were fused to encode a functional protein with first eight membrane spanning alpha-helices of the S. aureus and the last four helices of the E. coli protein. The hybrid protein provided arsenite resistance and transport. When an arsA gene was expressed in trans with the ArsB proteins encoded by the R773, pI258 and fusion genes, arsenite efflux was dependent on chemical but not electrochemical energy. The Ars system is hypothesized to be a novel transport system that functions as a primary ATP-driven pump or a secondary carrier, depending on the subunit composition of the complex.
Department of Biochemistry, Wayne State University, School of Medicine, Detroit, MI 48201.
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D000251:Adenosine Triphosphatases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D000965:Antimony / Q000494:pharmacology; D053501:Arsenite Transporting ATPases; D018053:Arsenites / Q000493:pharmacokinetics / Q000494:pharmacology; D004352:Drug Resistance, Microbial / Q000235:genetics; D004734:Energy Metabolism; D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology / Q000235:genetics; D016623:Ion Pumps; D017136:Ion Transport; D007700:Kinetics; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes; D011487:Protein Conformation; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013211:Staphylococcus aureus / Q000201:enzymology / Q000235:genetics
D018053:Arsenites; D016623:Ion Pumps; D009097:Multienzyme Complexes; D011993:Recombinant Fusion Proteins; D000965:Antimony; D000251:Adenosine Triphosphatases; D053501:Arsenite Transporting ATPases; C015001:arsenite