Identification of the Grincamycin Gene Cluster Unveils Divergent Roles for GcnQ in Different Hosts, Tailoring the l-Rhodinose Moiety

Organic Letters
2013.0

Abstract

The gene cluster responsible for grincamycin (GCN, 1) biosynthesis in Streptomyces lusitanus SCSIO LR32 was identified; heterologous expression of the GCN cluster in S. coelicolor M512 yielded P-1894B (1b) as a predominant product. The ΔgcnQ mutant accumulates intermediate 1a and two shunt products 2a and 3a bearing L-rhodinose for L-cinerulose A substitutions. In vitro data demonstrated that GcnQ is capable of iteratively tailoring the two L-rhodinose moieties into L-aculose moieties, supporting divergent roles of GcnQ in different hosts.

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