BIOSYNTHESIS OF LACTACYSTIN

被引:19
作者
TAKAHASHI, S
UCHIDA, K
NAKAGAWA, A
机构
[1] TEIKYO UNIV,DEPT BIOSCI,UTSUNOMIYA,TOCHIGI 320,JAPAN
[2] TOKYO METROPOLITAN UNIV,FAC SCI,HACHIOJI,TOKYO 192,JAPAN
[3] KITASATO UNIV,SCH PHARMACEUT SCI,MINATO KU,TOKYO 108,JAPAN
[4] KITASATO INST,MINATO KU,TOKYO 108,JAPAN
关键词
D O I
10.7164/antibiotics.48.1015
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The biosynthesis of lactacystin, a new microbial metabolite which induces differentiation of neuroblastoma cells, was studied by the feeding experiments of various C-13-labeled compounds and NMR spectroscopic analysis. The feeding experiments showed that lactacystin consists of three biosynthetic units, namely isobutyrate (and/or L-valine), L-leucine and L-cysteine. The C-10 unit containing gamma-lactam moiety arises by a condensation between methylmalonic semialdehyde and C-alpha position of L-leucine, followed by intramolecular cyclization. Two diastereotopic methyls, C-11 and C-12 of lactacystin were found to originate from the pro-R and pro-S methyls of leucine, respectively, as shown by incorporating a new type of chiral C-13-labeled L-leucine.
引用
收藏
页码:1015 / 1020
页数:6
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