Inhibition of .ALPHA.-chymotrypsin by Suc-L-Tyr-D-Leu-D-Phe-pNA, a stereoisomer of a specific substrate.
作者:YOSHIO OKADA、YUKO TSUDA、NAOKI TENO、YOKO NAGAMATSU、UTAKO OKAMOTO、NORIO NISHI
DOI:10.1248/cpb.33.5301
日期:——
Stereoisomers of specific chromogenic substrates for various enzymes were synthesized by a conventional solution method. Among them, Suc-L-Tyr-D-Leu-D-Phe-pNA was found to be an effective and specific inhibitor of α-chymotrypsin. However, Suc-L-Tyr-D-Leu-D-Phe-Pipe did not show any inhibitory effect on α-chymotrypsin. The role of the pNA moiety of the above stereoisomer was investigated, and it was found that the pNA moiety participated in binding with some part of the enzyme, resulting in the manifestation of the inhibitory activity.
采用传统的溶液法合成了多种酶的特定发色底物的立体异构体。其中,Suc-L-Tyr-D-Leu-D-Phe-pNA 是一种有效的α-糜蛋白酶特异性抑制剂。然而,Suc-L-Tyr-D-Leu-D-Phe-Pipe 对α-糜蛋白酶没有任何抑制作用。对上述立体异构体中 pNA 分子的作用进行了研究,发现 pNA 分子参与了与酶的某些部分的结合,从而导致抑制活性的显现。