Ab initio investigation of interactions between models of local anesthetics and receptor: complexes involving amine, phosphate, amide, Na+, K+, Ca2+, and Cl-.

Ab initio investigation of interactions between models of local anesthetics and receptor: complexes involving amine, phosphate, amide, Na+, K+, Ca2+, and Cl-.
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从头开始研究局部麻醉剂模型和受体模型之间的相互作用:涉及胺、磷酸盐、酰胺、Na 、K 、Ca2 和 Cl- 的复合物。

DOI:
10.1002/jps.2600770404
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发表时间:
1988
影响因子:
3.8
通讯作者:
Scheiner,S
Scheiner,S
中科院分区:
医学3区
文献类型:
--
作者:
Remko,M;Scheiner,S

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从头算分子轨道方法用于研究局部麻醉分子模型与神经膜内假定受体(磷脂和脂蛋白)之间的相互作用。局部麻醉剂的叔胺末端通过离子化和非离子化的三甲胺进行建模,而磷酸单阴离子和甲酰胺则模拟受体的适当部分。质子化的胺与磷酸根阴离子形成非常强的复合物,其中电荷转移到磷酸根上。虽然比这稍弱,但涉及胺(电离或非电离状态)和肽的复合物比肽间氢键强得多,这表明麻醉剂可以破坏蛋白质中的正常氢键模式。另一方面,这种相互作用必须与麻醉剂与体内存在的 Na+K+Ca2+ 和 Cl- 离子的相当紧密的结合竞争。
Ab initio molecular orbital methods are used to study the interactions between models of local anesthetic molecules and the putative receptors within the nerve membrane: phospholipids and lipoproteins. The tertiary amine terminus of local anesthetics was modeled by ionized and un-ionized trimethylamine, while phosphate monoanion and formamide emulated the appropriate portions of the receptor. The protonated amine forms a very strong complex with the phosphate anion in which the charge is transferred to the phosphate. While somewhat weaker than this, the complex involving the amine (in either its ionized or un-ionized state) and peptide is considerably stronger than interpeptide H bonds, suggesting the anesthetic can disrupt the normal H-bond patterns in a protein. On the other hand, such interactions must compete with the rather tight binding of the anesthetic with the Na+K+Ca2+and Cl–ions present in vivo.
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