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首页> 外文会议>NATO Advanced Research Workshop on The Chloroplast: From Molecular Biology to Biotechnology Kolymbari-Chania, Crete, Greece 10-15 August 1998 >Pigment-protein complexes, plastid development and photooxidative protection
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Pigment-protein complexes, plastid development and photooxidative protection

机译：颜料-蛋白质复合物，质体发育和光氧化保护

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摘要

Etiolated seedlings of angiosperms, the most highly evolved and diverse group of higher plants, synthesize chlorophyll (Chl) only upon exposure to light. In contrast, most oxygenic photosynthetic organisms also green when grown initially in the dark. The biochemical basis of light-dependent Chl biosynthesis is the strictly light- and NADPH-dependent enzymatic reduction of protochlorophyllide (Pchlide), a late Chl biosynthetic precursor, Pchlide is converted to chlorophyllide (Chlide) by two structurally related but differentially regulated enzymes, NADPH:Pchlide oxidoreductases (POR; EC 1.3.1.33) A and B, in the angiosperms Arabidopsis thaliana (3) and barley. Although PORA and PORB are both nuclear-encoded, translated in the cytosol, and ultimately imported into plastids, the PORA and PORB genes display dramatic differences in their regulation by light and developmental state, and the two enzymes have different plastid import requirements.
机译：被子植物的黄化幼苗是进化最迅速，种类最多的高等植物，仅在暴露于阳光下才能合成叶绿素（Chl）。相反，大多数含氧的光合生物最初在黑暗中生长时也会变绿。依赖光的Chl生物合成的生物化学基础是严格依赖光和NADPH的酶促还原原叶绿素（Pchlide），后者是Chl的生物合成前体，Pchlide通过两种结构相关但差异调节的酶NADPH转化为叶绿素（Chlide）。 ：被子植物拟南芥（3）和大麦中的磷脂氧化还原酶（POR; EC 1.3.1.33）A和B。尽管PORA和PORB都是核编码的，在细胞质中翻译并最终导入质体中，但PORA和PORB基因在受光和发育状态的调节方面显示出巨大差异，并且两种酶具有不同的质体输入要求。

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