Cu-complexes were isolated from cytosol of roots and leaves of spinach plants surviving in a medium containing a high concentration of copper without showing any symptoms of toxicity and possessing an efficiently acting photosynthetic apparatus. Most of the copper in cytosol is assumed to be bound to low molecular weight proteins. Two Cu-binding fractions, at a molecular weight of 12,500 and 9,500 respectively, were isolated from the roots. However, in the cytosol of the leaves only one fraction, at a molecular weight of 8,500, was isolated. It has been suggested that Cu-complexes are formed due to copper binding by preexisting proteins in cytosol and their synthesis seems to be stimulated by excess copper. They would be able to protect, among other things, the photosynthetic apparatus against the toxic effect of copper ions.

译文

:从在高浓度铜培养基中存活的菠菜植物的根和叶的细胞质中分离出铜复合物,而没有显示任何毒性症状并具有有效发挥光合作用能力的装置。假定胞质溶胶中的大多数铜与低分子量蛋白质结合。从根中分离出分子量分别为12,500和9,500的两个Cu结合级分。然而,在叶的胞质溶胶中,仅分离出分子量为8,500的一小部分。已经提出,由于铜在细胞质溶胶中与蛋白质结合而形成铜络合物,铜的合成似乎受到过量铜的刺激。它们将能够保护光合作用设备免受铜离子的毒性影响。

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