An SH-dependent protease is disclosed which is obtainable by crushing placentae of a mammal to thereby obtain a homogenate, centrifuging the homogenate and subjecting the resultant supernatant to affinity chromatography (I), ion exchange chromatography, gel filtration chromatography and affinity chromatography (II) in this order and which has the following physicochemical properties.
Function: cleaving L-prolyl-L-phenylalanyl-L-arginine 4-methyl-coumaryl-7-amide to produce L-prolyl-L-phenylalanyl-L-arginine and 7-amino-4-methyl-coumarin; Optimum pH range: 5.6 - 6.5; Range of optimum temperature: 36.5 - 37.5 °C; Stability: retaining its activity at -80 °C for at least 30 days in 5 mM acetate buffer (pH 5.0), and being completely denatured on heating at 100°C for 3 minutes; Molecular weight: 30 kDa.
An immunological tolerance inducing-agent comprising the SH-dependent protease as an active ingredient is also provided.
本发明公开了一种 SH 依赖性
蛋白酶,可通过粉碎哺乳动物的胎盘以获得匀浆,离心匀浆并将所得上清液依次进行亲和层析 (I)、离子交换层析、凝胶过滤层析和亲和层析 (II) 而获得,该
蛋白酶具有以下理化性质。
功能:裂解 L-脯
氨酰-L-苯丙
氨酰-
L-精氨酸 4-甲基
香豆素-7-酰胺,生成 L-脯
氨酰-L-苯丙
氨酰-
L-精氨酸和 7-
氨基-4-甲基
香豆素;最佳 pH 值范围:最佳 pH 值范围:5.6 - 6.5;最佳温度范围:36.5 - 37.5 °C稳定性:在 5 毫摩尔
醋酸盐缓冲液(pH 5.0)中-80 °C 下保持活性至少 30 天,100 °C加热 3 分钟后完全变性;分子量:30 kDa。
还提供了一种免疫耐受诱导剂,其活性成分包括 SH 依赖性
蛋白酶。