金属硫蛋白iv的生物学功能。含锌或镉大鼠肝脏和肾脏金属硫蛋白的生物合成和降解

S.H. Oh, J.T. Deagen, P.D. Whanger, P.H. Weswig
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引用次数: 36

摘要

采用单次注射14c -胱氨酸的方法,测定了鼠粮中锌含量为2000 ppm或镉含量为100 ppm时,肝脏和肾脏金属硫蛋白的半衰期。该蛋白经Sephadex G-75和DEAE纤维素柱层析纯化。饲喂基础锌(18 ppm)、高锌(2000 ppm)、高锌再基础锌和高镉(100 ppm)饲粮的大鼠肝脏金属硫蛋白半衰期分别为3.4、2.7、1.3和3.3 d,肾脏金属硫蛋白半衰期分别为2.0、2.2、1.4和3.6 d。因此,cd -硫蛋白在肝脏和肾脏中的半衰期都比zn -硫蛋白长。在DEAE纤维素上分离的金属硫蛋白的主要种类具有相似的半衰期。金属硫蛋白是一种金属含量高、半衰期短的蛋白质,可能参与细胞调节功能。
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Biological function of metallothionein-IV. Biosynthesis and degradation of liver and kidney metallothionein in rats fed diets containing zinc or cadmium

The half-lives of liver and kidney metallothionein of rats fed diets containing either 2,000 ppm Zn or 100 ppm Cd were determined by a single injection of 14C-cystine. This protein was purified by Sephadex G-75 and DEAE cellulose column chromatography. Half-lives of liver metallothionein in rats fed the basal (18 ppm Zn), high Zn (2,000 ppm Zn), high Zn then basal, and high Cd (100 ppm) diet were, respectively, 3.4, 2.7 1.3, and 3.3 days, and that of kidney metallothionein were, respectively, 2.0, 2.2, 1.4, and 3.6 days. Thus, Cd-thionein has a longer half-life than Zn-thionein in both liver and kidney. The major species of metallothionein, which were separated on DEAE cellulose, had similar half-lives. Metallothionein, a protein having high content of metals and relatively short half-life, is possibly involved in cellular regulatory function.

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