LHCII -一种像“瑞士军刀”一样的蛋白质,具有许多机制和功能。

IF 2.1 4区 生物学 Q2 PLANT SCIENCES Photosynthetica Pub Date : 2023-07-13 eCollection Date: 2023-01-01 DOI:10.32615/ps.2023.025
E Janik-Zabrotowicz, W I Gruszecki
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引用次数: 0

摘要

本文综述了高等植物光系统II捕光复合物(LHCII)的分子结构与光能利用的关系。LHCII的分子形态随光强的昼夜变化从低(约10 μmol(光子)m-2 s-1)到高(约1000 μmol(光子)m-2 s-1)快速可逆地转换,因此LHCII对光的敏感性可以控制光捕获和光保护状态的平衡。我们对这一机制的理解和概念是基于对不同LHCII分子形式(单体、二聚体、三聚体和聚集体)的结构和光物理的了解。提出LHCII单体、二聚体和横向聚集体是过量光耗散机制的基本块。三聚体特别适合发挥天线复合体的生理作用。LHCII的分子形态与复杂结构中存在的叶黄素周期色素紫黄质和玉米黄质之间存在相关性。此外,还讨论了LHCII蛋白磷酸化在类囊体膜结构中的作用。研究了LHCII在天然叶绿体类囊体膜、人工脂质-LHCII模型膜以及LHCII在洗涤剂溶液中悬浮的双重功能。
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LHCII - a protein like a 'Swiss Army knife' with many mechanisms and functions.

The review highlights the relationship between the molecular organization of the light-harvesting complex of photosystem II (LHCII) and sunlight utilization by higher plants. The molecular form of LHCII switches rapidly and reversibly during diurnal changes of light intensity, from low (ca. 10) to high [ca. 1,000 μmol(photon) m-2 s-1], so the sensitivity of LHCII to light may control the balance between light harvesting and photoprotection state. Our understanding and concept of this mechanism are based on the knowledge of the structure and photophysics of different LHCII molecular forms: monomer, dimer, trimer, and aggregate. It is proposed that LHCII monomers, dimers, and lateral aggregates are fundamental blocks of excess light-dissipation machinery. Trimer is exceptionally well suited to play a physiological role of an antenna complex. A correlation between the LHCII molecular form and the presence of xanthophyll cycle pigment violaxanthin and zeaxanthin in the complex structure is also shown. Moreover, the role of LHCII protein phosphorylation in thylakoid membrane architecture is also discussed. The dual function of LHCII has been studied in the natural thylakoid membranes of chloroplasts, in the artificial lipid-LHCII model membranes, and by suspension of LHCII in a detergent solution.

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来源期刊
Photosynthetica
Photosynthetica 生物-植物科学
CiteScore
5.60
自引率
7.40%
发文量
55
审稿时长
3.8 months
期刊介绍: Photosynthetica publishes original scientific papers and brief communications, reviews on specialized topics, book reviews and announcements and reports covering wide range of photosynthesis research or research including photosynthetic parameters of both experimental and theoretical nature and dealing with physiology, biophysics, biochemistry, molecular biology on one side and leaf optics, stress physiology and ecology of photosynthesis on the other side. The language of journal is English (British or American). Papers should not be published or under consideration for publication elsewhere.
期刊最新文献
On "P750s" in cyanobacteria: A historical perspective. Impact of exogenous rhamnolipids on plant photosynthesis and biochemical parameters under prolonged heat stress. Chloroplast antioxidant reactions associated with zinc-alleviating effects on iron toxicity in wheat seedlings. Using hyperspectral reflectance to detect changes in photosynthetic activity in Atractylodes chinensis leaves as a function of decreasing soil water content. Ascorbic acid is involved in melatonin-induced salinity tolerance of maize (Zea mays L.) by regulating antioxidant and photosynthetic capacities.
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