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脂肪酸向 CD36 受体转运机制的计算分析与分子动力学

The computational analyses, molecular dynamics of fatty-acid transport mechanism to the CD36 receptor.

机构信息

Laboratory of Biotechnology (MedBiotech), Rabat Medical and Pharmacy School, Mohammed V University in Rabat, Rabat, Morocco.

UMR_S 1134, INSERM, DSIMB, Université Paris Diderot, Sorbonne Paris Cite, Paris, France.

出版信息

Sci Rep. 2021 Dec 1;11(1):23207. doi: 10.1038/s41598-021-01373-5.

Abstract

The transmembrane glycoprotein CD36, which is responsible of the metabolic disorders, and the elevated intake of fat induces lipid buildup, is a multifunctional scavenger receptor signaling those functions in high-affinity tissue uptake of long-chain fatty acids. In this study, we used series of molecular dynamics simulations of the wild type and mutants types K164A CD36 protein interacting with one palmitic acid (PLM) besides simulations of the wild type interacting with the three PLM to find out the mechanism of the functioning of the complex CD36/Fatty acids and the unraveling of the role of the mutation. Additionally we determined whether Lys164, mostly exposed to protein surface, played important roles in fatty acid uptake. These simulations revealed, the conformational changes induced by Lys164 residue and the altered interactions induced by the mutagenesis of surface lysine that was badly influencing the folding, utility, solubility, and stability form of the variant. Furthermore, Lys164 residue provided the structural basis of forming an opening at the region of principal portal for the dissociation of palmitic acid. The results of our simulations revealed hole two fatty acids found in CD36 cavity structure and it was the most preferred to CD36 structure stabilization.

摘要

跨膜糖蛋白 CD36 负责代谢紊乱,而脂肪的摄入增加会导致脂质堆积,它是一种多功能的清道夫受体,在高亲和力组织中摄取长链脂肪酸的功能。在这项研究中,我们使用了一系列野生型和突变型 K164A CD36 蛋白与一个棕榈酸 (PLM) 相互作用的分子动力学模拟,以及野生型与三个 PLM 相互作用的模拟,以找出 CD36/脂肪酸复合物的作用机制和突变的作用。此外,我们还确定了大部分暴露在蛋白质表面的赖氨酸 164 是否在脂肪酸摄取中发挥了重要作用。这些模拟表明,赖氨酸 164 残基诱导的构象变化和表面赖氨酸突变诱导的相互作用改变,严重影响了变体的折叠、用途、溶解度和稳定性。此外,赖氨酸 164 残基为在主要入口区域形成开口提供了结构基础,用于棕榈酸的解离。我们的模拟结果揭示了在 CD36 腔结构中发现的两个脂肪酸孔,这是最有利于 CD36 结构稳定的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cba5/8636502/ab03e63d47e1/41598_2021_1373_Fig1_HTML.jpg

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