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首页> 外文期刊>Journal of Experimental Botany >Antenna proton sensitivity determines photosynthetic light harvesting strategy
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Antenna proton sensitivity determines photosynthetic light harvesting strategy

机译：天线质子敏感度决定光合光收集策略

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Photoprotective non-photochemical quenching (NPQ) represents an effective way to dissipate the light energy absorbed in excess by most phototrophs. It is often claimed that NPQ formation/relaxation kinetics are determined by xanthophyll composition. We, however, found that, for the alveolate alga Chromera velia, this is not the case. In the present paper, we investigated the reasons for the constitutive high rate of quenching displayed by the alga by comparing its light harvesting strategies with those of a model phototroph, the land plant Spinacia oleracea. Experimental results and in silico studies support the idea that fast quenching is due not to xanthophylls, but to intrinsic properties of the Chromera light harvesting complex (CLH) protein, related to amino acid composition and protein folding. The pK(a) for CLH quenching was shifted by 0.5 units to a higher pH compared with higher plant antennas (light harvesting complex II; LHCII). We conclude that, whilst higher plant LHCIIs are better suited for light harvesting, CLHs are 'natural quenchers' ready to switch into a dissipative state. We propose that organisms with antenna proteins intrinsically more sensitive to protons, such as C. velia, carry a relatively high concentration of violaxanthin to improve their light harvesting. In contrast, higher plants need less violaxanthin per chlorophyll because LHCII proteins are more efficient light harvesters and instead require co-factors such as zeaxanthin and PsbS to accelerate and enhance quenching.
机译：光保护非光化学淬火（NPQ）代表了使大多数光助性吸收过量的光能的有效方法。通常声称，NPQ形成/弛豫动力学由Xanthophyl1组合物决定。然而，我们发现，对于肺泡藻类柔性威尔，这不是这种情况。在本文中，我们通过将其光学收获策略与模型光谱，土地植物Spinacia Oleracea的光谱策略进行比较，研究了藻类本构高级淬火率的原因。实验结果和Silico研究支持的想法，即快速淬火是由于不适用于叶黄素，而是与氨基酸组合物和蛋白质折叠有关的铬光收获复合物（CLH）蛋白质的固有性质。与高等植物天线相比，ClH猝灭的PK（A）将0.5个单位移位至更高的pH（光收缩复合物II; LHCII）。我们得出结论，虽然植物更高的植物LHCIIS更适合光线收获，但CLHS是“自然猝灭剂”准备好转化为耗散状态。我们提出与天线蛋白质的生物体本质上更敏感的质子，例如C.Velia，携带相对高的virosanthin，以改善它们的光收获。相比之下，较高的植物每叶绿素需要较少的伏硫蛋白，因为LHCII蛋白是更有效的光收割机，而是需要Zeaxanthin和PSB等共同因子来加速和增强猝灭。

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