New antimitotic bicyclic peptides, celogentins D-H, and J, from the seeds of Celosia argentea |
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Authors: | Hayato SuzukiHiroshi Morita Shigeo IwasakiJun'ichi Kobayashi |
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Institution: | a Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan b Kitasato Institute for Life Science, Kitasato University, Tokyo 108-8642, Japan |
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Abstract: | Six new bicyclic peptides, celogentins D-H (1-5) and J (6) have been isolated from the seeds of Celosia argentea, and the structures including its absolute stereochemistry were determined by using extensive NMR methods and chemical means. Celogentins E-H (2-5) and J (6) showed potent inhibition of tubulin polymerization, while the inhibitory activity of celogentin D (1) was modest. Structure-activity relationship study indicates that ring size of the bicyclic ring system including unusual βs-Leu, Trp, and His residues would be important for their biological activity. |
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Keywords: | peptides Celosia argentea tubulin polymerization |
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