A new syringopeptin produced by bean strains of Pseudomonas syringae pv. syringae

Ingeborg Grgurina , Feliciana Mariotti , Vincenzo Fogliano , Monica Gallo , Andrea Scaloni , Nicola S. Iacobellis , Pietro Lo Cantore , Luisa Mannina , Valeria van Axel Castelli , Maria Luigia Greco , Antonio Graniti
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引用次数: 38

Abstract

Two strains (B728a and Y37) of the phytopathogenic bacterium Pseudomonas syringae pv. syringae isolated from bean (Phaseolus vulgaris) plants were shown to produce in culture both syringomycin, a lipodepsinonapeptide secreted by the majority of the strains of the bacterium, and a new form of syringopeptin, SP22Phv. The structure of the latter metabolite was elucidated by the combined use of mass spectrometry (MS), nuclear magnetic resonance (NMR) spectroscopy and chemical procedures. Comparative phytotoxic and antimicrobial assays showed that SP22Phv did not differ substantially from the previously characterized syringopeptin 22 (SP22) as far as toxicity to plants was concerned, but was less active in inhibiting the growth of the test fungi Rhodotorula pilimanae and Geotrichum candidum and of the Gram-positive bacterium Bacillus megaterium.

丁香假单胞菌产一种新的丁香素。两
植物致病菌丁香假单胞菌(Pseudomonas syringae pv) B728a和Y37。从豆(Phaseolus vulgaris)植物中分离的丁香属植物在培养中显示出紫丁香霉素(一种由大多数菌株分泌的脂沉肽)和一种新形式的紫丁香素(SP22Phv)。后一种代谢物的结构由质谱(MS)、核磁共振(NMR)谱和化学方法联合阐明。对比植物毒性和抗菌试验表明,SP22Phv与先前鉴定的syringopeptin 22 (SP22)在植物毒性方面没有太大差异,但对试验真菌红霉菌(Rhodotorula pilimanae)和铁皮土曲菌(Geotrichum candidum)以及革兰氏阳性细菌巨芽孢杆菌的抑制作用较弱。
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