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  • Title: The pab gene of Streptomyces griseus, encoding p-aminobenzoic acid synthase, is located between genes possibly involved in candicidin biosynthesis.
    Author: Criado LM, Martín JF, Gil JA.
    Journal: Gene; 1993 Apr 15; 126(1):135-9. PubMed ID: 8472954.
    Abstract:
    The nucleotide (nt) sequence of the gene (pab) encoding p-aminobenzoic acid (PABA) synthase, a key enzyme in the biosynthesis of candicidin by Streptomyces griseus IMRU3570, was determined and an open reading frame (ORF) of 2171 nt was found. The predicted amino acid sequence demonstrated extensive sequence identity with PABA synthases (Pab) from Gram-negative Enterobacteria. The protein encoded by ORF pab shows a clear relationship at the N terminus with PabA and at the C terminus with PabB from Escherichia coli, Serratia and Klebsiella. We also determined the extent of a spontaneous deletion that removed the ORF located upstream from pab near the 5' end of the cloned fragment. The deletion occurred when the gene was cloned in the BamHI site of pBR322 and allowed pab expression in E. coli.
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