Characterization of the biosynthetic gene cluster for the antifungal polyketide soraphen A from Sorangium cellulosum So ce26

James Ligon, Steven Hill, James Beck, Ross Zirkle, István Molnár, Jennifer Zawodny, Stephanie Money, Thomas Schupp

Research output: Contribution to journalArticle

78 Scopus citations

Abstract

A genomic DNA region of over 80 kb that contains the complete biosynthetic gene cluster for the synthesis of the antifungal polyketide metabolite soraphen A was cloned from Sorangium cellulosum So ce26. The nucleotide sequence of the soraphen A gene region, including 67,523 bp was determined. Examination of this sequence led to the identification of two adjacent type I polyketide synthase (PKS) genes that encode the soraphen synthase. One of the soraphen A PKS genes includes three biosynthetic modules and the second contains five additional modules for a total of eight. The predicted substrate specificities of the acyltransferase (AT) domains, as well as the reductive loop domains identified within each module, are consistent with expectations from the structure of soraphen A. Genes were identified in the regions flanking the two soraphen synthase genes that are proposed to have roles in the biosynthesis of soraphen A. Downstream of the soraphen PKS genes is an O-methyltransferase (OMT) gene. Upstream of the soraphen PKS genes there is a gene encoding a reductase and a group of genes that are postulated to have roles in the synthesis of methoxymalonyl-acyl carrier protein (ACP). This unusual extender unit is proposed to be incorporated in two positions of the soraphen polyketide chain. One of the genes in this group contains distinct domains for an AT, an ACP, and an OMT.

Original languageEnglish (US)
Pages (from-to)257-267
Number of pages11
JournalGene
Volume285
Issue number1-2
DOIs
StatePublished - Feb 20 2002
Externally publishedYes

Keywords

  • Methoxymalonyl-CoA
  • Methoxymalonyl-CoA synthase
  • Methyltransferase
  • Polyketide synthase

ASJC Scopus subject areas

  • Genetics

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