期刊
ACS CHEMICAL BIOLOGY
卷 17, 期 12, 页码 3313-3320出版社
AMER CHEMICAL SOC
DOI: 10.1021/acschembio.1c00276
关键词
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资金
- JSPS KAKENHI
- [18H04628]
- [20H04784]
This study reports the isolation, structure elucidation, and biological characterization of a new class of bacterial polyynes called protegenins, which contribute to the antioomycete and plant-protective effects of Pseudomonas protegens.
Some bacteria uniquely produce bacterial polyynes, which possess a conjugated Cr C bond starting with a terminal alkyne, and use them as chemical weapons against hosts and competitors. Pseudomonas protegens CabS7, a biocontrol agent against plant pathogens, has an orphan biosynthetic gene cluster for bacterial polyynes (named protegenins). In this study, the isolation, structure elucidation, and biological characterization of protegenins A-D are reported. The structures of protegenins A-D determined by spectroscopic and chemical techniques were octadecanoic acid derivatives possessing an ene-tetrayne, ene-triyne-ene, or ene-triyne moiety. The protegenins exhibited weak to strong antioomycete activity against Pythium ultimum OPU774. The deletion of proA, a protegenin biosynthetic gene, resulted in the reduction of the antioomycete activity of P. protegens. The Gac/Rsm system, a quorum sensing-like system of Pseudomonas bacteria, regulated the production of protegenins. The production profile of protegenins was dependent on the culturing conditions, suggesting a control mechanism for protegenin production selectivity. P. protegens suppressed the damping-off of cucumber seedlings caused by P. ultimum, and this protective effect was reduced in the proA-deletion mutant. Altogether, protegenins are a new class of bacterial polyynes which contribute to the antioomycete and plant-protective effects of P. protegens.
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