Longicatenamides A–D, two diastereomeric pairs of new cyclic hexapeptides, were isolated from the combined-culture of Streptomyces sp. KUSC_F05 and Tsukamurella pulmonis TP-B0596. Their planar structures were determined by spectroscopic analysis including extensive 2D NMR and MS analysis. The absolute configurations of their component amino acids were determined by the use of highly sensitive reagents we recently developed; the highly sensitive-advanced Marfey’s method (HS-advanced Marfey’s method), which led us to reduce the sample loss and prevent incorrect structural determination. Particularly, the Cβ-stereochemistry of hyGlu in longicatenamides A and C was assigned without any use of Cβ-Marfey’s methods. Longicatenamide A exhibited weak but preferential antimicrobial activity against Bacillus subtilis.
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This work was financially supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan [17H06401 (H.K.), 18K14396 (T.K.), and 19H02840 (H.K.)], the Platform Project for Supporting Drug Discovery and Life Science Research from the Japan Agency for Medical Research and Development (AMED) [20am01092j0004 (H.K.)], Japan, and the Tokyo Biochemical Research Foundation (T.K.).
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Jiang, Y., Matsumoto, T., Kuranaga, T. et al. Longicatenamides A–D, Two Diastereomeric Pairs of Cyclic Hexapeptides Produced by Combined-culture of Streptomyces sp. KUSC_F05 and Tsukamurella pulmonis TP-B0596. J Antibiot 74, 307–316 (2021). https://doi.org/10.1038/s41429-020-00400-3
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