Identification of the putative bryostatin polyketide synthase gene cluster from "Candidatus Endobugula sertula", the uncultivated microbial symbiont of the marine bryozoan Bugula neritina

Sebastian Sudek, Nicole B. Lopanik, Laura E. Waggoner, Mark Hildebrand, Christine Anderson, Haibin Liu, Amrish Patel, David H. Sherman, Margo Haygood

Research output: Contribution to journalArticle

229 Citations (Scopus)

Abstract

The bryostatins are protein kinase C modulators with unique structural features and potential anticancer and neurological activities. These complex polyketides were isolated from the marine bryozoan Bugula neritina, but recent studies indicate that they are produced by the uncultured symbiotic bacterium "Candidatus Endobugula sertula" ("E. sertula"). Here we present the putative biosynthetic genes: five modular polyketide synthase (PKS) genes, a discrete acyltransferase, a β-ketosynthase, a hydroxy-methyl- glutaryl CoA synthase (HMG-CS), and a methyltransferase. The cluster was sequenced in two closely related "E. sertula" strains from different host species. In one strain the gene cluster is contiguous, while in the other strain it is split into two loci, with one locus containing the PKS genes and the other containing the accessory genes. Here, we propose a hypothesis for the biosynthesis of the bryostatins. Thirteen PKS modules form the core macrolactone ring, and the pendent methyl ester groups are added by the HMG-CS gene cassette. The resulting hypothetical compound bryostatin 0 is the common basis for the 20 known bryostatins. As "E. sertula" is to date uncultured, heterologous expression of this biosynthetic gene cluster has the potential of producing the bioactive bryostatins in large enough quantities for development into a pharmaceutical.

Original languageEnglish (US)
Pages (from-to)67-74
Number of pages8
JournalJournal of Natural Products
Volume70
Issue number1
DOIs
StatePublished - Jan 2007
Externally publishedYes

Fingerprint

bryostatins
Bryostatins
Polyketide Synthases
polyketide synthases
Multigene Family
multigene family
symbionts
Genes
genes
Polyketides
Acyltransferases
polyketides
acyltransferases
loci
methyltransferases
Methyltransferases
protein kinase C
Protein Kinase C
Esters
Biosynthesis

ASJC Scopus subject areas

  • Plant Science
  • Chemistry (miscellaneous)
  • Drug Discovery
  • Organic Chemistry
  • Pharmacology

Cite this

Identification of the putative bryostatin polyketide synthase gene cluster from "Candidatus Endobugula sertula", the uncultivated microbial symbiont of the marine bryozoan Bugula neritina. / Sudek, Sebastian; Lopanik, Nicole B.; Waggoner, Laura E.; Hildebrand, Mark; Anderson, Christine; Liu, Haibin; Patel, Amrish; Sherman, David H.; Haygood, Margo.

In: Journal of Natural Products, Vol. 70, No. 1, 01.2007, p. 67-74.

Research output: Contribution to journalArticle

Sudek, Sebastian ; Lopanik, Nicole B. ; Waggoner, Laura E. ; Hildebrand, Mark ; Anderson, Christine ; Liu, Haibin ; Patel, Amrish ; Sherman, David H. ; Haygood, Margo. / Identification of the putative bryostatin polyketide synthase gene cluster from "Candidatus Endobugula sertula", the uncultivated microbial symbiont of the marine bryozoan Bugula neritina. In: Journal of Natural Products. 2007 ; Vol. 70, No. 1. pp. 67-74.
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abstract = "The bryostatins are protein kinase C modulators with unique structural features and potential anticancer and neurological activities. These complex polyketides were isolated from the marine bryozoan Bugula neritina, but recent studies indicate that they are produced by the uncultured symbiotic bacterium {"}Candidatus Endobugula sertula{"} ({"}E. sertula{"}). Here we present the putative biosynthetic genes: five modular polyketide synthase (PKS) genes, a discrete acyltransferase, a β-ketosynthase, a hydroxy-methyl- glutaryl CoA synthase (HMG-CS), and a methyltransferase. The cluster was sequenced in two closely related {"}E. sertula{"} strains from different host species. In one strain the gene cluster is contiguous, while in the other strain it is split into two loci, with one locus containing the PKS genes and the other containing the accessory genes. Here, we propose a hypothesis for the biosynthesis of the bryostatins. Thirteen PKS modules form the core macrolactone ring, and the pendent methyl ester groups are added by the HMG-CS gene cassette. The resulting hypothetical compound bryostatin 0 is the common basis for the 20 known bryostatins. As {"}E. sertula{"} is to date uncultured, heterologous expression of this biosynthetic gene cluster has the potential of producing the bioactive bryostatins in large enough quantities for development into a pharmaceutical.",
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