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菠菜(Spinacia oleracea)叶绿体中的谷胱甘肽和抗坏血酸。过氧化氢和百草枯的影响。

Glutathione and ascorbic acid in spinach (Spinacia oleracea) chloroplasts. The effect of hydrogen peroxide and of Paraquat.

作者信息

Law M Y, Charles S A, Halliwell B

出版信息

Biochem J. 1983 Mar 15;210(3):899-903. doi: 10.1042/bj2100899.

Abstract

The stroma of spinach chloroplasts contains ascorbic acid and glutathione at millimolar concentrations. [Reduced glutathione]/[oxidized glutathione] and [ascorbate]/[dehydroascorbate] ratios are high under both light and dark conditions and no evidence for a role of oxidized glutathione or dehydroascorbate in the dark-deactivation of fructose bisphosphatase could be obtained. Addition of H2O2 to chloroplasts in the dark decreases the above ratios, an effect that is reversed on illumination. Addition of Paraquat to illuminated chloroplasts caused a rapid oxidation of reduced glutathione and ascorbate, and apparent loss of dehydroascorbate. Paraquat rapidly inactivated fructose bisphosphatase activity, as assayed under physiological conditions.

摘要

菠菜叶绿体的基质中含有毫摩尔浓度的抗坏血酸和谷胱甘肽。在光照和黑暗条件下,[还原型谷胱甘肽]/[氧化型谷胱甘肽]和[抗坏血酸盐]/[脱氢抗坏血酸盐]的比值都很高,且未获得氧化型谷胱甘肽或脱氢抗坏血酸盐在果糖双磷酸酶暗失活中起作用的证据。在黑暗中向叶绿体中添加过氧化氢会降低上述比值,光照后这种效应会逆转。向光照的叶绿体中添加百草枯会导致还原型谷胱甘肽和抗坏血酸迅速氧化,脱氢抗坏血酸盐明显损失。如在生理条件下测定的那样,百草枯会迅速使果糖双磷酸酶失活。

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