The enzymatic hydrolysis of dipeptides by carboxypeptidase-Y and carboxypeptidase-A was investigated. In the enzymatic hydrolysis of the dipeptides, a good linear relationship (r = 0.997 and 0.999) was found between the Michaelis–Menten constant (Km) and the hydrophobicity of the substrates evaluated from relative elution volume in reversed-phase HPLC. The correlation suggests that the hydrophobicity of the C-terminal amino acid is a major factor in governing the stability of the enzyme–substrate complex. The difference in the slope of the linear-regression lines seems to reflect the degree of relative hydrophobicity of the binding pockets in carboxypeptidase-Y and carboxypeptidase-A.
研究了羧肽酶Y和
羧肽酶A对二肽的酶解
水解作用。在二肽的酶解
水解过程中,发现米氏常数(Km)与通过反相高效
液相色谱的相对洗脱体积评估的底物疏
水性之间存在良好的线性关系(r = 0.997 和 0.999)。这种相关性表明,C端
氨基酸的疏
水性是影响酶-底物复合体稳定性的主要因素。线性回归线的斜率差异似乎反映了羧肽酶Y和
羧肽酶A结合口袋的相对疏
水性程度。