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Hamster skeletal muscle contains a wide-specificity calpain which was found to be a calpain II type and which is composed of a single Mr 80,000 polypeptide. 2. The muscle also contains a calpain I type enzyme which is specific for desmin degradation, and this enzyme consists of a single subunit of Mr 67,000. 3. Three calpastatins were detected in the tissue, one of which inhibited both calpains, whereas the other two appeared to be specific for the desmin-specific calpain. These calpastatins possessed the same inhibition properties when assayed with chicken gizzard calpains.

仓鼠骨骼肌含有一种具有广泛底物特异性的钙蛋白酶，该酶被发现属于钙蛋白酶II型，由一条分子量为80,000的单一多肽组成。2. 该肌肉还含有一种对结蛋白降解具有特异性的钙蛋白酶I型酶，这种酶由一个分子量为67,000的单一亚基组成。3. 在该组织中检测到三种钙蛋白酶抑制蛋白，其中一种抑制两种钙蛋白酶，而另外两种似乎对结蛋白特异性钙蛋白酶具有特异性。当用鸡胗钙蛋白酶进行测定时，这些钙蛋白酶抑制蛋白具有相同的抑制特性。

Hamster skeletal muscle contains a wide-specificity calpain which was found to be a calpain II type and which is composed of a single Mr 80,000 polypeptide. 2. The muscle also contains a calpain I type enzyme which is specific for desmin degradation, and this enzyme consists of a single subunit of Mr 67,000. 3. Three calpastatins were detected in the tissue, one of which inhibited both calpains, whereas the other two appeared to be specific for the desmin-specific calpain. These calpastatins possessed the same inhibition properties when assayed with chicken gizzard calpains.

仓鼠骨骼肌含有一种具有广泛底物特异性的钙蛋白酶，该酶被发现属于钙蛋白酶II型，由一条分子量为80,000的单一多肽组成。2. 该肌肉还含有一种对结蛋白降解具有特异性的钙蛋白酶I型酶，这种酶由一个分子量为67,000的单一亚基组成。3. 在该组织中检测到三种钙蛋白酶抑制蛋白，其中一种抑制两种钙蛋白酶，而另外两种似乎对结蛋白特异性钙蛋白酶具有特异性。当用鸡胗钙蛋白酶进行测定时，这些钙蛋白酶抑制蛋白具有相同的抑制特性。

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