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Volume 147, Issue 10

The gene cluster for chloramphenicol biosynthesis in ISP5230 includes novel shikimate pathway homologues and a monomodular non-ribosomal peptide synthetase gene

The GenBank accession number for the sequence reported in this paper is AF262220.

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Abstract

Regions of the ISP5230 chromosome flanking , an amino-deoxychorismate synthase gene needed for chloramphenicol (Cm) production, were examined for involvement in biosynthesis of the antibiotic. Three of four ORFs in the sequence downstream of resembled genes involved in the shikimate pathway. BLASTX searches of GenBank showed that the deduced amino acid sequences of ORF3 and ORF4 were similar to proteins encoded by monofunctional genes for chorismate mutase and prephenate dehydrogenase, respectively, while the sequence of the ORF5 product resembled deoxy--heptulosonate-7-phosphate (DAHP) synthase, the enzyme that initiates the shikimate pathway. A relationship to Cm biosynthesis was indicated by sequence similarities between the ORF6 product and membrane proteins associated with Cm export. BLASTX searches of GenBank for matches with the translated sequence of ORF1 in chromosomal DNA immediately upstream of did not detect products relevant to Cm biosynthesis. However, the presence of Cm biosynthesis genes in a 75 kb segment of the chromosome beyond ORF1 was inferred when conjugal transfer of the DNA into a blocked mutant restored Cm production. Deletions in the 75 kb segment of the wild-type chromosome eliminated Cm production, confirming the presence of Cm biosynthesis genes in this region. Sequencing and analysis located five ORFs, one of which (ORF8) was deduced from BLAST searches of GenBank, and from characteristic motifs detected in alignments of its deduced amino acid sequence, to be a monomodular nonribosomal peptide synthetase. GenBank searches did not identify ORF7, but matched the translated sequences of ORFs 9, 10 and 11 with short-chain ketoreductases, the ATP-binding cassettes of ABC transporters, and coenzyme A ligases, respectively. As has been shown for ORF2, disrupting ORF3, ORF7, ORF8 or ORF9 blocked Cm production.

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Keyword(s): ADC, 4-amino-4-deoxychorismate , Am, apramycin , Cm, chloramphenicol , DAHP, deoxy-arabino-heptulosonate-7-phosphate , gene disruption , Km, kanamycin , mutant complementation , NRPS, non-ribosomal peptide synthetase , p-aminophenylalanine , PABA, p-aminobenzoic acid , PAPA, p-aminophenylalanine , PAPS, p-aminophenylserine , sequence analysis and Ts, thiostrepton
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2001-10-01
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The gene cluster for chloramphenicol biosynthesis in Streptomyces venezuelae ISP5230 includes novel shikimate pathway homologues and a monomodular non-ribosomal peptide synthetase geneThe GenBank accession number for the sequence reported in this paper is AF262220.
Microbiology 147, 2817 (2001); https://doi.org/10.1099/00221287-147-10-2817
/content/journal/micro/10.1099/00221287-147-10-2817
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