Light Stress Proteins in Viruses, Cyanobacteria and Photosynthetic Eukaryota
Light Stress Proteins in Viruses, Cyanobacteria and Photosynthetic Eukaryota
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病毒、蓝细菌和光合真核生物中的光应激蛋白
DOI：
10.1007/978-94-007-1579-0_14
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Adamska I
中科院分区：
文献类型：
--
作者：
Heddad M;Engelken J;Adamska I
自然界中的植物经常感受到极端环境，如光胁迫。为了在光胁迫条件下维持其生理功能，植物发展了不同的保护策略，这些策略在形态、解剖和亚细胞水平上起作用。来自ELIP（早期光诱导蛋白）家族的光胁迫蛋白的积累可以被认为是这种光保护反应的一部分。ELIPs是光系统I和II的叶绿素a/b-结合蛋白的远亲，其在某些生理胁迫条件下仅在类囊体膜中瞬时积累。基于预测的二级结构，ELIP家族成员在蓝藻和病毒中被分为三螺旋ELIP、二螺旋SEP（胁迫增强蛋白）和单螺旋OHP（单螺旋蛋白），也称为HLIP（高光诱导蛋白）或SCP（小叶绿素结合样蛋白）。据信，这些蛋白质在光胁迫条件下通过瞬时结合游离叶绿素并防止自由基的形成和/或通过充当激发能的汇（sink）而在叶绿体内起保护作用。扩展功能基因组学提供了新的工具，用于识别与ELIP家族成员结构和/或功能相关的基因和蛋白质，这些基因和蛋白质以前通过经典分子生物学或生物化学方法无法检测到。本章概述了“经典”ELIP家族成员，讨论了它们的进化和光保护功能，并介绍了藻类和陆地植物中的新型ELIP样蛋白。
Plants in Nature frequently perceive environmental extremes such as light stress. To maintain their physiological functions under light stress conditions plants have developed different protection strategies that operate at morphological, anatomical and subcellular levels. The accumulation of light stress proteins from the ELIP (early light-induced protein) family can be considered to be a part of such photoprotective responses. ELIPs are distant relatives of the chlorophylla/b-binding proteins of photosystem I and II that accumulate only transiently in thylakoid membranes under certain physiological stress conditions. Based on predicted secondary structure ELIP family members are divided into three-helix ELIPs, two-helix SEPs (stress-enhanced proteins) and one-helix OHPs (one-helix proteins), called also HLIPs (high light-induced proteins) or SCPs (small chlorophyll-binding-like proteins) in cyanobacteria and viruses. It is believed that these proteins play a protective role within the chloroplast under light stress conditions either by transient binding of free chlorophylls and preventing the formation of free radicals and/or by acting as sinks for excitation energy. Expanding functional genomics provided new tools for the identification of genes and proteins structurally and/or functionally related to ELIP family members that escaped previous detection by classical molecular biology or biochemical methods. This chapter provides an overview of “classical” ELIP family members, discusses their evolution and photoprotective functions and introduces novel types of ELIP-like proteins in algae and land plants.
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