ISOLATION AND PROPERTIES OF CASEIN KINASES FROM HUMAN PLATELETS

ISOLATION AND PROPERTIES OF CASEIN KINASES FROM HUMAN PLATELETS
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人血小板酪蛋白激酶的分离和性质

DOI:
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发表时间:
1982
期刊:
影响因子:
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通讯作者:
H. Yamamura
H. Yamamura
中科院分区:
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作者:
Akira Kikuchi;S. Tomisaka;K. Yonezawa;A. Sano;H. Yamamura

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通过 DEAE-sephacel 和磷酸纤维素色谱法从人血小板中部分纯化出两种不依赖于环 AMP 的酪蛋白激酶,并将其指定为 CK-I 和 CK-II。这些激酶的区别如下: 1) CK-I 的分子量约为 48,000,CK-II 的分子量约为 130,000; 2) 这些酶中 ATP 和酪蛋白的最适 pH 和 Mg“、Km 相似,但不相同;3) 肝素可以完全抑制 CK-II,但不能抑制 CK-I;4) 多聚赖氨酸刺激 CK-II,但不能刺激 CK-I;5) NaCl (200 mM) 刺激 CK-II 的活性约 400 %,但 CK-I 仅受 NaCl 刺激20%;6)虽然CK-I只能磷酸化酪蛋白的丝氨酰残基,但CK-II可以磷酸化大约等量的丝氨酰残基和苏氨酰残基。这些结果表明CK-I和CK-II具有完全不同的物理和动力学特性,并且这些激酶在人血小板中的生理作用似乎不同。
Two cyclic AMP-independent casein kinases were partially purified from human platelets by chromatography on DEAE-sephacel and phosphocellulose, and desig-nated CK-I and CK-II. These kinases differ as follows: 1) the molecular weight of CK-I is about 48,000 and that of CK-II is about 130,000; 2) optimum pH and Mg“, Km for ATP and casein are similar but not identical in these enzymes; 3) heparin can inhibit CK-II completely, but it cannot inhibit CK-I; 4) polylysine stimulates CK-II, but it cannot stimulate CK-I; 5) NaCl (200 mM) stimulates the activity of CK-II about 400 %, but CK-I is stimulated by NaCl only 20%; 6) although CK-I can phosphorylate only seryl residue of casein, CK-II can phosphorylate both seryl and threonyl residue in about equal amounts. These results show that CK-I and CK-II have quite different physical and kinetic properties, and the physiological role of these kinases in human platelets seems to be different.
肝素对酪蛋白激酶 II 的抑制作用。
DOI: --
发表时间: 1980
期刊: The Journal of biological chemistry
影响因子: --
作者:
Hathaway,GM;Lubben,TH;Traugh,JA
通讯作者: Traugh,JA