Several shorter analogues of heat-stable enterotoxin (ST) produced by Yersinia enterocolitica were synthesized by a conventional method and their toxicities were examined by using suckling mice. The full enterotoxigenic activity of ST of Y. enterocolitica was found to be carried on a peptide, which consists of 13 amino acid residues from the 18th Cys to the C-terminal Cys and has a similar amino acid sequence to those of ST’s produced by enterotoxigenic Escherichia coli (S. Aimoto et al., Eur. J. Biochem., 129, 257 (1982)) and Vibrio cholerae non-01 (T. Takao et al., FEBS Lett., 193, 250 (1985)). The results imply that the structural elements for expression of the toxicity are present in the common amino acid sequences of ST’s of Y. enterocolitica, E. coli, and V. cholerae non-01.
                                    由耶尔森菌(Yersinia enterocolitica)产生的几种较短的热稳定肠毒素(ST)类物质通过常规方法合成,使用吮吸小鼠检测其毒性。发现耶尔森菌的ST的完全肠毒素活性依赖于一个由13个
氨基酸残基组成的肽,该肽从第18个半胱
氨酸(Cys)到C端半胱
氨酸(Cys),其
氨基酸序列与肠毒性大肠杆菌(Enterotoxigenic Escherichia coli)和非01霍乱弧菌(Vibrio cholerae non-01)产生的ST相似(S. Aimoto等,欧盟
生物化学杂志,129,257(1982)和T. Takao等,FEBS通讯,193,250(1985))。结果表明,表达毒性的结构元素存在于耶尔森菌、大肠杆菌和非01霍乱弧菌的ST的共同
氨基酸序列中。