The trpF Nucleotide Sequence and Its Promoter Analysis in Pseudomonas aeruginosa

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The nucleotide sequence of the gene for the phosphoribosyl anthranilate isomerase (PRAI) (trpF) in Pseudomonas aeruginosa was determined. The gene encoded a polypeptide of 211 amino acid residues and its initiation codon was UUG. Northern hybridization analysis showed only one transcript for trpF (about 700 nucleotides). Primer extension analysis revealed three transcription start sites which were at positions 52, 55 and 57 bases upstream of the initiation codon. A highly GC-rich 9-base-pair inverted repeat with 5-base-pair spacing was found upstream of a putative Shine-Dalgarno sequence. This inverted repeat could form a 23-nucleotide stem-loop structure in the transcript. Deletion of the inverted repeat slightly decreased the promoter activity of trpF. The presence of tryptophan had no effect on transcription of trpF.

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