Production of the antimicrobial secondary metabolite indigoidine contributes to competitive surface colonization by the marine roseobacter Phaeobacter sp. strain Y4I.

Applied and Environmental Microbiology
W Nathan CudeAlison Buchan

Abstract

Members of the Roseobacter lineage of marine bacteria are prolific surface colonizers in marine coastal environments, and antimicrobial secondary metabolite production has been hypothesized to provide a competitive advantage to colonizing roseobacters. Here, we report that the roseobacter Phaeobacter sp. strain Y4I produces the blue pigment indigoidine via a nonribosomal peptide synthase (NRPS)-based biosynthetic pathway encoded by a novel series of genetically linked genes: igiBCDFE. A Tn5-based random mutagenesis library of Y4I showed a perfect correlation between indigoidine production by the Phaeobacter strain and inhibition of Vibrio fischeri on agar plates, revealing a previously unrecognized bioactivity of this molecule. In addition, igiD null mutants (igiD encoding the indigoidine NRPS) were more resistant to hydrogen peroxide, less motile, and faster to colonize an artificial surface than the wild-type strain. Collectively, these data provide evidence for pleiotropic effects of indigoidine production in this strain. Gene expression assays support phenotypic observations and demonstrate that igiD gene expression is upregulated during growth on surfaces. Furthermore, competitive cocultures of V. fischeri and Y4I show tha...Continue Reading

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Oct 12, 2012·Journal of Industrial Microbiology & Biotechnology·Dayu YuJixun Zhan
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