Abstract
Studies of the protein function of Borrelia burgdorferi have been limited by a lack of tools for manipulating borrelial DNA. We devised a system to study the function of a B. burgdorferi oligopeptide permease (Opp) orthologue by complementation with Escherichia coli Opp proteins. The Opp system of E. coli has been extensively studied and has well defined substrate specificities. The system is of interest in B. burgdorferi because analysis of its genome has revealed little identifiable machinery for synthesis or transport of amino acids and only a single intact peptide transporter operon. As such, peptide uptake may play a major role in nutrition for the organism. Substrate specificity for ABC peptide transporters in other organisms is determined by their substrate binding protein. The B. burgdorferi Opp operon differs from the E. coli Opp operon in that it has three separate substrate binding proteins, OppA-1, -2 and -3. In addition, B. burgdorferi has two OppA orthologues, OppA-4 and -5, encoded on separate plasmids. The substrate binding proteins interact with integral membrane proteins, OppB and OppC, to transport peptides into the cell. The process is driven by two ATP binding proteins, OppD and OppF. Using opp-deleted E. c...Continue Reading
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