環状デプシペプチドSurfactinに関する研究(第1報)納豆菌(Bacillus natto KMD 2311)の産生する8種Surfactin同族体の単離と構造
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Crude surfactin was simply prepared from the culture filtrate of Bacillus natto KMD 2311 twice by acidification of the filtrate and extraction of the precipitate with ethanol. Eight surfactin analogs were isolated from the crude surfactin by RP-HPLC and gel filtration. The structure of each analog was deduced by means of amino acid composition of the acid hydrolysate and FAB-MS measurement to be a cyclic depsipeptide containing a hydroxyfatty acid. The structure of the hydroxyfatty acid moieties was elucidated as n-or iso-or anteiso-3-hydroxyfatty acid composed of carbon number 13-16 by GC analysis and EI-MS after the methanolysis of the analogs. The amino acid sequence of the peptide portion was assigned as acyl-Glu-Leu-Leu-Val-Asp-Leu-Leu by EI-MS for eight analogs. The isolated four compounds were found to be identical with the known surfactin analogs, A_1,B_1,B_2 and C_1. Although surfactin A_2 and C_2 had not been isolated, their structures were deduced to be a surfactin analog. Surfactin A_3 and D were novel analogs. The acyl groups of surfactin A_2,A_3,C_2 and D were anteiso-3-hydroxytridecanoic acid, n-3-hydroxytridecanoic acid, anteiso-3-hydroxypentadecanoic acid and iso-3-hydroxyhexadecanoic acid, respectively.
- 社団法人日本薬学会の論文
- 1995-09-25
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