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J. Bacteriol., 01 1995, 252-258, Vol 177, No. 1
TR Merriman, ME Merriman and IL Lamont
Pseudomonas aeruginosa secretes a fluorescent siderophore, pyoverdine, when
grown under iron-deficient conditions. Pyoverdine consists of a
chromophoric group bound to a partly cyclic octapeptide. As a step toward
understanding the molecular events involved in pyoverdine synthesis, we
have sequenced a gene, pvdD, required for this process. The gene encodes a
2,448-residue protein, PvdD, which has a predicted molecular mass of
273,061 Da and contains two highly similar domains of about 1,000 amino
acids each. The protein is similar to peptide synthetases from a range of
bacterial and fungal species, indicating that synthesis of the peptide
moiety of pyoverdine proceeds by a nonribosomal mechanism. The pvdD gene is
adjacent to a gene, fpvA, which encodes an outer membrane receptor protein
required for uptake of ferripyoverdine.
Copyright © 1995, American Society for Microbiology
Nucleotide sequence of pvdD, a pyoverdine biosynthetic gene from Pseudomonas aeruginosa: PvdD has similarity to peptide synthetases
Department of Biochemistry, University of Otago, Dunedin, New Zealand.
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