The physicochemical and immunochemical properties of fourteen taurine dipeptides (1-14) containing one of eleven neutral L-amino acids or three neutral D-amino acids were examined. These taurine peptides were synthesized by a conventional method using chemical coupling of taurine with an amino acid. Alternatively, the dipeptides (1-9) containing L-amino acid were also synthesized, with a few exceptions (10, 11), by a new method using a general substitution reaction of a sulfo group for chlorine or bromine via the β-halogenoethyl amide of each amino acid. When sodium sulfite or ammonium sulfite was used in the substitution, the new method gave pure taurine dipeptides in good yield without racemization. All the dipeptides (1-14), including naturally occurring Ser-Tau, showed high cross-reactivities with antisera against haptenic taurine or γGlu-Tau.
研究了含有 11 个中性 L-
氨基酸或 3 个中性 D-
氨基酸中的一个的 14 种
牛磺酸二肽(1-14)的物理
化学和免疫
化学特性。这些
牛磺酸肽是用
牛磺酸与
氨基酸化学偶联的传统方法合成的。另外,含有 L-
氨基酸的二肽(1-9)也是通过一种新方法合成的,除了少数例外(10、11),这种方法是通过每个
氨基酸的 β-卤代乙基酰胺,用一个磺基对
氯或
溴进行一般的取代反应。当使用
亚硫酸钠或
亚硫酸铵进行取代反应时,新方法能得到纯度很高的
牛磺酸二肽,且无外消旋现象。所有二肽(1-14),包括天然存在的 Ser-Tau,都与针对七价
牛磺酸或 γGlu-Tau 的抗血清有很高的交叉反应活性。