Abstract
Sequence analysis immediately downstream (3′) of a genomic region ofSynechococcus sp. WH7803, encoding a periplasmic phosphate-binding protein (PstS), revealed an open reading frame encoding a protein of 224 amino acids. The protein exhibited considerable sequence similarity to a family of bacterial transcriptional activators that includes Crp and Fnr and consequently the ORF is designatedptrA (putativetranscriptional activator). Upstream ofptrA a 18 nucleotide sequence representing a putative Pho box was found. Homologues of theptrA gene were detected in several other phycoerythrin-containing marineSynechococcus strains. This represents the third cyanobacterial member of this class of DNA-binding protein to be described and the first such homologue in the ecologically important marineSynechococcus group. The location ofptrA immediately downstream frompstS may implicate this protein in global phosphate regulation.
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