Petrosamine Revisited. Experimental and Computational Investigation of Solvatochromism, Tautomerism and Free Energy Landscapes of a Pyridoacridinium Quaternary Salt.

Petrosamine Revisited. Experimental and Computational Investigation of Solvatochromism, Tautomerism and Free Energy Landscapes of a Pyridoacridinium Quaternary Salt.
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DOI:
10.3390/md21080446
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发表时间:
2023-08-11
期刊:
影响因子:
5.4
通讯作者:
--
中科院分区:
医学2区
文献类型:
--
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Petrosamine (1) 是一种来自伯利兹海绵 Petrosia sp. 的有色吡啶吖啶生物碱,也是乙酰胆碱酯酶 (AChE) 的有效抑制剂,通过光谱和计算方法进行了研究。对无石油胺的能量图谱、pKa 和互变异构现象的分析揭示了 1 的分子结构的精确电子描述为二酮形式,其净电荷为 q = +1,而不是在分离纯化的环境条件下的双阳离子 (q = +2)。据报道,1 的显着溶剂化显色现象(UV-vis)和相关类似物均经过详细研究,最好的解释是电荷离域和 1 的基态(HOMO)稳定,而不是竞争性互变异构体的平衡。通过 QM 方法对分子结构 1 的细化补充了已发表的计算对接研究,以确定酶活性位点中的接触点,这可能会改进基于吡啶吖啶生物碱分子骨架的新型 AChE 抑制剂的设计。
Petrosamine (1)—a colored pyridoacridine alkaloid from the Belizean sponge, Petrosia sp., that is also a potent inhibitor of acetylcholine esterase (AChE)—was investigated by spectroscopic and computational methods. Analysis of the petrosamine-free energy landscapes, pKa and tautomerism, revealed an accurate electronic depiction of the molecular structure of 1 as the di-keto form, with a net charge of q = +1, rather than a dication (q = +2) under ambient conditions of isolation-purification. The pronounced solvatochromism (UV-vis) reported for 1, and related analogs were investigated in detail and is best explained by charge delocalization and stabilization of the ground state (HOMO) of 1 rather than an equilibrium of competing tautomers. Refinement of the molecular structure 1 by QM methods complements published computational docking studies to define the contact points in the enzyme active site that may improve the design of new AChE inhibitors based on the pyridoacridine alkaloid molecular skeleton.
DOI: 10.1021/ja00333a049
发表时间: 1984-01-01
影响因子: 15
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