文章基本信息

标题：Conformational ensembles of non-peptide ω-conotoxin mimetics and Ca 2 ion binding to human voltage-gated N-type calcium channel Cav2.2
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作者：Sameera ; Fawad Ali Shah ; Sajid Rashid 等
期刊名称：Computational and Structural Biotechnology Journal
印刷版ISSN：2001-0370
出版年度：2020
卷号：18
页码：2357-2372
DOI：10.1016/j.csbj.2020.08.027
出版社：Computational and Structural Biotechnology Journal
摘要：Chronic neuropathic pain is the most complex and challenging clinical problem of a population that sets a major physical and economic burden at the global level. Ca 2 -permeable channels functionally orchestrate the processing of pain signals. Among them, N-type voltage-gated calcium channels (VGCC) hold prominent contribution in the pain signal transduction and serve as prime targets for synaptic transmission block and attenuation of neuropathic pain. Here, we present detailed in silico analysis to comprehend the underlying conformational changes upon Ca 2 ion passage through Ca v 2.2 to differentially correlate subtle transitions induced via binding of a conopeptide-mimetic alkylphenyl ether-based analogue MVIIA. Interestingly, pronounced conformational changes were witnessed at the proximal carboxyl-terminus of Ca v 2.2 that attained an upright orientation upon Ca 2 ion permeability. Moreover, remarkable changes were observed in the architecture of channel tunnel. These findings illustrate that inhibitor binding to Ca v 2.2 may induce more narrowing in the pore size as compared to Ca 2 binding through modulating the hydrophilicity pattern at the selectivity region. A significant reduction in the tunnel volume at the selectivity filter and its enhancement at the activation gate of Ca 2 -bound Ca v 2.2 suggests that ion binding modulates the outward splaying of pore-lining S6 helices to open the voltage gate. Overall, current study delineates dynamic conformational ensembles in terms of Ca 2 ion and MVIIA-associated structural implications in the Ca v 2.2 that may help in better therapeutic intervention to chronic and neuropathic pain management.
关键词：Chronic neuropathic pain ; N-type voltage-gated calcium channel (Ca_v2.2) ; Non-peptide ω-conotoxin mimetics inhibitor ; Synaptic transmission