TY - DATA T1 - Isolation and structural characterization of a non-diketopiperazine phytotoxin from a potato pathogenic Streptomyces strain PY - 2018/10/11 AU - María Inés Lapaz AU - Andrés López AU - José Carlos Huguet-Tapia AU - Martín Fabián Pérez-Baldassari AU - Cesar Iglesias AU - Rosemary Loria AU - Guillermo Moyna AU - María Julia Pianzzola UR - https://tandf.figshare.com/articles/journal_contribution/Isolation_and_structural_characterization_of_a_non-diketopiperazine_phytotoxin_from_a_potato_pathogenic_i_Streptomyces_i_strain/7194941 DO - 10.6084/m9.figshare.7194941.v1 L4 - https://ndownloader.figshare.com/files/13247165 KW - Desmethylmensacarcin KW - phytotoxin KW - potato common scab KW - Streptomyces spp N2 - Two Streptomyces spp. strains responsible for potato common scab infections in Uruguay which do not produce diketopiperazines were identified through whole-genome sequencing, and the virulence factor produced by one of them was isolated and characterized. Phylogenetic analysis showed that both pathogenic strains can be identified as S. niveiscabiei, and the structure of the phytotoxin was elucidated as that of the polyketide desmethylmensacarcin using MS and NMR methods. The metabolite is produced in yields of ∼200 mg/L of culture media, induces deep necrotic lesions on potato tubers, stuns root and shoot growth in radish seedlings, and is comparatively more aggressive than thaxtomin A. This is the first time that desmethylmensacarcin, a member of a class of compounds known for their antitumor and antibiotic activity, is associated with phytotoxicity. More importantly, it represents the discovery of a new virulence factor related to potato common scab, an economically-important disease affecting potato production worldwide. ER -