Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 76, Issue 11, Pages 3568-3574Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.02858-09
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Funding
- BMBF [02WT0799]
- Pakt fur Forschung und Innovation of the Free State of Thuringia
- Federal Ministry of Science and Technology (BMBF, Germany)
- DFG-funded excellence graduate school Jena School for Microbial Communication (JSMC)
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Microviridins are ribosomally synthesized tricyclic depsipeptides produced by different genera of cyanobacteria. The prevalence of the microviridin gene clusters and the natural diversity of microviridin precursor sequences are currently unknown. Screening of laboratory strains and field samples of the bloom-forming freshwater cyanobacterium Microcystis via PCR revealed global occurrence of the microviridin pathway and an unexpected natural variety. We could detect 15 new variants of the precursor gene mdnA encoding microviridin backbones that differ in up to 4 amino acid positions from known isoforms of the peptide. The survey not only provides insights into the versatility of the biosynthetic enzymes in a closely related group of cyanobacteria, but also facilitates the discovery and characterization of cryptic microviridin variants. This is demonstrated for microviridin L in Microcystis aeruginosa strain NIES843 and heterologously produced variants.
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