Interactions of membrane proteins with lipid molecules are central to their stability and function. We have used multiscale molecular dynamics simulations to determine the extent to which interactions with lipids are conserved across the aquaporin (Aqp) family of membrane proteins. Simulation-based assessment of the lipid interactions made by Aqps when embedded within a simple phospholipid bilayer agrees well with the protein-lipid contacts determined by electron diffraction from 2D crystals. Extending this simulation-based analysis to all Aqps of known structure reveals a degree of conservation of such interactions across the Aqp structural proteome. Despite similarities in the binding orientations and interactions of the lipids, there do not appear to be distinct, high-specificity lipid binding sites on the surface of Aqps. Rather Aqps exhibit a more broadly conserved protein/lipid interface, suggestive of interchange between annular and bulk lipids, instead of a fixed annular "shell" of lipids.

译文

膜蛋白与脂质分子的相互作用是其稳定性和功能的核心。我们已经使用多尺度分子动力学模拟来确定在整个膜蛋白的水通道蛋白 (Aqp) 家族中与脂质的相互作用的保守程度。当Aqps嵌入简单的磷脂双分子层中时,基于模拟的脂质相互作用评估与通过2D晶体的电子衍射确定的蛋白质-脂质接触非常吻合。将这种基于模拟的分析扩展到所有已知结构的Aqp,揭示了整个Aqp结构蛋白质组之间这种相互作用的守恒程度。尽管脂质的结合方向和相互作用相似,但Aqps表面似乎没有明显的高特异性脂质结合位点。相反,aqp表现出更广泛保守的蛋白质/脂质界面,提示环形脂质和大块脂质之间存在互换,而不是固定的环形脂质 “壳”。

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