Germin , an Oxalate Oxidase , Has a Function in Many Aspects of Plant Life
Germin , an Oxalate Oxidase , Has a Function in Many Aspects of Plant Life
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Germin 是一种草酸氧化酶，在植物生命的许多方面都有作用
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Kemal
中科院分区：
文献类型：
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作者：
M. Kemal
Germin是小麦胚萌发的分子标记，是一种抗蛋白酶的同源五聚体质外体糖蛋白。已经发现了与植物发育的各个方面相关的不同形式的萌发素。在谷类、双子叶被子植物、裸子植物和植物中发现了萌发蛋白，由于它们的DNA序列同源性，所有这些蛋白统称为萌发样蛋白。谷物胚芽具有草酸氧化酶活性，该活性通过降解草酸产生过氧化氢。这两种分子都参与了植物细胞发育、分化、信号传导和防御系统的调控。在双子叶植物中发现的萌发样蛋白似乎不具有草酸氧化酶活性。近年来，研究表明，类萌发蛋白与种子贮藏蛋白（豌豆球蛋白、豆球蛋白）、蔗糖结合蛋白（SBS）和球蛋白有关。基于这些相似性，有人提出所有这些蛋白质都是结构相关但功能不同的蛋白质的“超家族”的成员。生殖素和类生殖素蛋白参与植物的发育、渗透调节、光周期振荡、防御和凋亡等重要生理过程。
Germin, a molecular marker of wheat embryo germination, is a remarkably proteaseresistant, apoplastic, homopentameric glycoprotein. Different forms of germin found to be related to various aspects of plant development have been discovered. Germins were determined in cereals, dicotyledonous angiosperms, gymnosperms and in a prosit, all these proteins are together called germin-like proteins due to their DNA sequence homology. Cereal germins have oxalate oxidase activity, an activity which generates hydrogen peroxide by degrading oxalic acid. Both of these molecules have been implied in the regulation of cell development, differentiation, signalling and defence systems of plants. The germin-like proteins found in dicotyledonous plants do not appear to have oxalate oxidase activity. Recently, germin-like proteins were shown to be related to seed storage proteins (vicilins, legumins), SBS (sucrose-binding proteins) and spherulins. On the basis of these similarities, it was proposed that all these proteins are members of a “superfamily” which are structurally related but functionally distinct proteins. Germin and germin-like proteins seem to be involved in the various important processes of plants including development, osmotic regulation, photoperiodic oscillation, defence and apoptosis.