Rat ceruloplasmin: resistance to proteolysis and kinetic comparison with human ceruloplasmin.

Rat ceruloplasmin: resistance to proteolysis and kinetic comparison with human ceruloplasmin.
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大鼠铜蓝蛋白:对蛋白水解的抵抗力以及与人铜蓝蛋白的动力学比较。

DOI:
10.1016/0003-9861(92)90357-3
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发表时间:
1992
影响因子:
3.9
通讯作者:
Aust,SD
Aust,SD
中科院分区:
生物学3区
文献类型:
--
作者:
Ryan,TP;Grover,TA;Aust,SD

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使用快速蛋白液相色谱法从血清中纯化大鼠血浆铜蓝蛋白,并与以相同方式分离的人血浆铜蓝蛋白进行比较。发现大鼠铜蓝蛋白比人铜蓝蛋白更耐纤溶酶介导的蛋白水解。虽然这两种蛋白质最初被切割成表观分子量为116,000和20,000 Da的产物,但大鼠血浆铜蓝蛋白对进一步的蛋白水解具有抗性,而人类酶被切割成较小的片段。一级结构的差异可以解释两种酶之间不同的相对稳定性。大鼠血浆铜蓝蛋白的动力学分析产生了一个双相的v vs v s图,铁的表观Km为40和1.5 μ m。当与人类酶相比,大鼠铜蓝蛋白表现出约四分之一的铁氧化酶活性,并有一个更广泛的pH值比人类铜蓝蛋白。大鼠铜蓝蛋白对苯二胺的氧化速率约为人铜蓝蛋白的一半,在pH 5.0时两种酶的对苯二胺氧化酶活性最大。
Rat ceruloplasmin was purified from serum using fast protein liquid chromatography and compared to human ceruloplasmin isolated in the same manner. Rat ceruloplasmin was found to be more resistant to plasmin-mediated proteolysis than was human ceruloplasmin. Although both proteins were cleaved initially to products with apparent molecular weights of 116,000 and 20,000 Da, rat ceruloplasmin was resistant to further proteolysis, whereas the human enzyme was cleaved to smaller fragments. Primary structure differences could account for the different relative stabilities between the two enzymes. Kinetic analysis of rat ceruloplasmin produced a biphasic v vs v s plot with apparent K m's of 40 and 1.5 μ m for iron. When compared with the human enzyme, rat ceruloplasmin showed about one-fourth the ferroxidase activity and had a much broader pH profile than that of human ceruloplasmin. Rates of p-phenylenediamine oxidation by rat ceruloplasmin were about one-half those obtained with human ceruloplasmin, with maximal p-phenylenediamine oxidase activity at pH 5.0 for both enzymes.
DOI: 10.1016/s0021-9258(18)50692-x
发表时间: 1979
期刊: The Journal of biological chemistry
影响因子: --
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DOI: --
发表时间: 1989-01
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期刊: Biochimica et Biophysica Acta
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发表时间: 1974
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