Hydrolysis of beta-casein by gastric proteases. I. Comparison of proteolytic action of bovine chymosin and pepsin A.

H Guillou, G Miranda, J P Pelissier
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Abstract

Hydrolysis of beta A2-casein by bovine chymosin and pepsin A was performed in order to compare the hydrolysis of the two enzymes on this protein. Different conditions have been tested: pH 5.5 for 116h and pH 3.5 for 7 h [E/S = 1/100 (w/w)] for chymosin. pH 3.0 for 24 h [E/S = 1/1000 (w/w)] for pepsin A. Under these conditions 17 peptides were obtained after the action of chymosin and 23 after the action of pepsin A. They corresponded respectively to the cleavage of 14 and 15 peptide bonds for chymosin and pepsin A. However, six of the peptide bonds were only hydrolyzed by chymosin and seven other bonds only by pepsin A. Our results showed a preferential splitting at the Leu-X, Ser-X, and Trp-X bonds for chymosin and Leu-X, Met-X, and Thr-X, for pepsin A. Some of the identified peptides contained sequences with possible physiological roles.

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胃蛋白酶对-酪蛋白的水解。牛凝乳酶与胃蛋白酶A蛋白水解作用的比较。
为了比较牛凝乳酶和胃蛋白酶A对β a2 -酪蛋白的水解作用,我们进行了两种酶对β a2 -酪蛋白的水解。在不同的条件下测试了凝血酶:pH为5.5 116h, pH为3.5 7h [E/S = 1/100 (w/w)]。pH值3.0 24 h (E / S = 1/1000 (w / w)]对胃蛋白酶a在这些条件下取得了17肽在凝乳酶的作用和行动后的23个胃蛋白酶a。它们分别对应的乳沟14和15肽债券对凝乳酶和胃蛋白酶a .然而,六肽债券只有水解的凝乳酶和其他七个债券只有胃蛋白酶a。我们的结果显示一个优惠Leu-X分裂,Ser-X,和Trp-X债券凝乳酶和Leu-X Met-X, Thr-X,一些已鉴定的肽含有可能具有生理作用的序列。
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