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首页> 外文会议>Photosynthesis research for food, fuel and future >Effect of Lipids on Violaxanthin and Diadinoxanthin De-Epoxidation
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Effect of Lipids on Violaxanthin and Diadinoxanthin De-Epoxidation

机译：脂质对紫黄质和二恶黄质脱环氧化的影响

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摘要

Violaxanthin (Vx) and diadinoxanthin (Ddx) deepoxidation are light dependent steps in one of the most important photoprotecting processes called respectively violaxanthin and diadinoxanthin cycle. Violaxanthin cycle operates in vascular plants and many groups of algae while diadinoxanthin cycle is present in diatoms. In this study the influence of lipids on de-epoxidation of Vx and Ddx was investigated. In particular, the dependence between conversion of Vx into antheraxanthin and zeaxanthin as well as Ddx to diatoxanthin and the molecular dynamics of hydrophobic fraction of aggregates formed by inverted micelles, which are necessary for deepoxidation, was studied. Thickness of the hydrophobic fraction of the aggregates, size of the inverted micelles, suggested by mathematical description of these structures and solubility of Vx and Ddx in various kind of lipids were the other tested parameters. Obtained results show that the rate of de-epoxidation is strongly dependent on physical/chemical properties of lipids. The key role for violaxanthin or diadinoxanthin de-epoxidase activation play non-bilayer lipids and the parameters of inverted micelles created by mem, such as thickness, diameter and molecular dynamics of their hydrophobic core.
机译：紫黄质（Vx）和二恶黄质（Ddx）的深度氧化是光依赖性步骤，是最重要的光保护过程之一，分别称为紫黄质和二恶黄质循环。紫黄质循环在维管束植物和许多藻类中起作用，而二恶黄质循环存在于硅藻中。在这项研究中，研究了脂质对Vx和Ddx脱环氧化的影响。特别地，研究了Vx转化为花药黄素和玉米黄质以及Ddx转化为重黄嘌呤与深氧化所必需的由反向胶束形成的聚集体疏水部分的分子动力学之间的依赖性。其他测试参数包括通过对这些结构的数学描述以及Vx和Ddx在各种脂质中的溶解度暗示的聚集体疏水部分的厚度，反胶束的大小。获得的结果表明，脱环氧化的速率强烈依赖于脂质的物理/化学性质。紫黄质或二恶黄质脱环氧化物酶活化的关键作用是发挥非双层脂质的作用，以及由mem产生的反胶束参数，例如其疏水核的厚度，直径和分子动力学。

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