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胰蛋白酶(Trypsin)、糜蛋白酶(Chymotrypsin)和弹性蛋白酶(Elastase)是三种在消化过程中起重要作用的丝氨酸蛋白酶。 它们主要由胰腺产生并分泌到小肠中,帮助分解食物中的蛋白质,以便身体能够吸收和利用这些蛋白质中的氨基酸。 苯甲基磺酰氟(PMSF),常用于蛋白质的提取过程中,是胰蛋白酶、胰凝乳蛋白酶的抑制剂,可抑制丝氨酸蛋白酶例如胰蛋白酶 (trypsin)和胰凝乳蛋白酶 (chymotrypsin),也可抑制半胱氨酸蛋白酶和乙酰胆碱酯酶,是一种高强度毒性的胆碱酯酶抑制剂。 牛胰腺来源的 糜蛋白酶 的肽段水解位点主要是C端含有 芳香族氨基酸 (aromatic amino acid),包括 苯丙氨酸 (Phe),色氨酸(Trp),赖氨酸(Tyr)等,也有文献报道能够水解 亮氨酸 (Leu)。 Nelson, Cox. Lehningher principles of biochemistry 5th.2008. p96 and G-3. Appel W. Chymotrypsin: molecular and catalytic properties. Clin. Biochem.
常见的内肽酶包括胃蛋白酶(pepsin)、胰蛋白酶(trypsin、chymotrypsin等)等。 外肽酶(exopeptidase):外肽酶是一类能够从蛋白质分子的末端切割肽链的酶。 它们主要作用于蛋白质的N-末端或C-末端,通过逐步切割肽链上的氨基酸残基来产生较短的肽段或游离氨基酸。 蛋白质的水化层。引自Proc Natl Acad Sci U S A. 2002 虽然二者相关,但毕竟是两回事。控制合适的条件,就可以只发生其中的一种。举例来说,盐析时蛋白是沉淀的,但并未变性。这是因为盐析只是用高浓度盐破坏了蛋白质外部的水化层和双电层,并未破坏其内部用来维持构象的次级键。否则的话,盐析. 糜蛋白酶, 或胰凝乳蛋白酶(Chymotrypsin):R1=苯丙氨酸Phe,色氨酸Trp,酪氨酸Tyr; 亮氨酸Leu,蛋氨酸Met和组氨酸His水解稍慢。 胃蛋白酶, Pepsin:R1和R2=R1=苯丙氨酸Phe,色氨酸Trp,酪氨酸Tyr; 亮氨酸Leu以及其它疏水性氨基酸水解速度较快。
DFP的抑制常数相似,可以有效抑制胰蛋白酶(trypsin)、糜蛋白酶 (chymotrypsin)、纤溶酶(plasmin)、激肽释放酶(kallikrein)和凝血酶 (thrombin)等蛋白酶,作为PMSF和DFP的替代物,AEBSF的毒性更低、 水溶性和水溶液稳定性更好。
此时,胃蛋白酶和盐酸仍会继续分解这些食糜,虽然盐酸会在小肠中被碳酸氢盐这类碱性物质中和,但小肠中包含的胰蛋白酶(trypsin,分解自从胰腺分泌的胰蛋白酶原 - trypsinogen [4] )和糜蛋白酶(chymotrypsin,亦称作胰凝乳蛋白酶,前体是糜蛋白酶原. 舍雷肽酶(Chymotrypsin)是胰蛋白酶家族中的一员,是一种消化酶。 它能分解蛋白质和多肽,并将它们转化为小分子物质,以供身体吸收。 舍雷肽酶主要在胰腺中产生,并通过十二指肠释放进入肠道,协助促进蛋白质的消化和吸收。 ③牛的胰凝乳蛋白酶或称糜蛋白酶 ( chymotrypsin),此酶的专一性不如胰蛋白酶。 它断裂Phe、Trp或Tyr等疏水氨基酸残基的羧基侧肽键。 如果断裂点邻近的基团是碱性的残基,裂解能力增强,是酸性的,裂解能力减弱。
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