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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A role for direct interactions in the modulation of rhodopsin by omega-3 polyunsaturated lipids
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A role for direct interactions in the modulation of rhodopsin by omega-3 polyunsaturated lipids

机译：直接相互作用在omega-3多不饱和脂质调节视紫红质中的作用

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摘要

Rhodopsin, the G protein-coupled receptor primarily responsible for sensing light, is found in an environment rich in polyunsaturated lipid chains and cholesterol. Biophysical experiments have shown that lipid unsaturation and cholesterol both have significant effects on rhodopsin's stability and function; omega-3 polyunsaturated chains, such as docosahexaenoic acid (DHA), destabilize rhodopsin and enhance the kinetics of the photocycle, whereas cholesterol has the opposite effect. Here, we use molecular dynamics simulations to investigate the possibility that polyunsaturated chains modulate rhodopsin stability and kinetics via specific direct interactions. By analyzing the results of 26 independent 100-ns simulations of dark-adapted rhodopsin, we found that DHA routinely forms tight associations with the protein in a small number of specific locations qualitatively different from the nonspecific interactions made by saturated chains and cholesterol. Furthermore, the presence of tightly packed DHA molecules tends to weaken the interhelical packing. These results are consistent with recent NMR work, which proposes that rhodopsin binds DHA, and they suggest a molecular rationale for DHA's effects on rhodopsin stability and kinetics.
机译：在富含多不饱和脂质链和胆固醇的环境中发现了视紫红质，这是一种G蛋白偶联受体，主要负责感测光。生物物理实验表明，脂质不饱和度和胆固醇均对视紫红质的稳定性和功能有重要影响。诸如二十二碳六烯酸（DHA）的omega-3多不饱和链会破坏视紫红质并增强光循环的动力学，而胆固醇则具有相反的作用。在这里，我们使用分子动力学模拟来研究多不饱和链通过特定的直接相互作用调节视紫红质稳定性和动力学的可能性。通过分析暗适应性视紫红质的26个独立的100 ns模拟结果，我们发现DHA通常在少量特定位置与蛋白质形成紧密的结合，其质量与饱和链和胆固醇产生的非特异性相互作用不同。此外，紧密堆积的DHA分子的存在倾向于削弱螺旋间的堆积。这些结果与最近的NMR工作一致，后者提出视紫红质结合DHA，并且为DHA对视紫红质稳定性和动力学的影响提出了分子原理。

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