Structural requirements of N-blocked L-proline derivatives as specific inhibitors for prolyl endopeptidase were investigated using a series of substrate analogs. Replacement of L-proline by its D-isomer remarkably reduced the inhibition. Introduction of a sulfur atom in proline and/or in the penultimate pyrrolidine rings significantly increased the inhibition, but the introduction of oxygen rather diminished the activity. A peptide linkage (acid-amide bond) between the proline and the pyrrolidine ring was also required to keep the inhibitory activity. A benzyloxycarbonyl group was most effective as an N-blocked component of the inhibitors.
使用一系列底物类似物研究了作为脯
氨酰内肽酶特异性
抑制剂的 N-受阻
L-脯氨酸衍
生物的结构要求。用
L-脯氨酸的 D-异构体取代
L-脯氨酸明显降低了抑制作用。在脯
氨酸和/或倒数第二个
吡咯烷环中引入一个
硫原子会显著增加抑制作用,但引入氧反而会降低活性。脯
氨酸和
吡咯烷环之间的肽键(酸酰胺键)也是保持抑制活性的必要条件。苄氧羰基作为
抑制剂的 N-受阻成分最为有效。