   7.4.2.2 | ORFsalr4167 and alr3187 encode, respectively, an ATPase subunit, BgtA, and a composite protein bearing periplasmic substrate-binding and transmembrane domains, BgtB, of an ABC-type high-affinity basic amino acid uptake transporter Bgt. ORF alr4167 is clustered with ORFs alr4164, alr4165 and alr4166 that encode a periplasmic substrate-binding protein, NatF, and transmembrane proteins NatG and NatH respectively. The NatF, NatG, NatH and BgtA proteins constitute an ABC-type uptake transporter for acidic and neutral polar amino acids, N-II, Bgt and N-II transport systems thus share the ATPase subunit, BgtA. Structure of the strain PCC 7120 genomic regions carrying the bgtB gene and the natF-natG-natH-bgtA gene cluster, overview, expression of the Bgt and N-II transporters as GFP-tagged proteins in strain PCC 7120 |
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