First CoMFA characterization of vesamicol analogs as ligands for the vesicular acetylcholine transporter.

First CoMFA characterization of vesamicol analogs as ligands for the vesicular acetylcholine transporter.
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首次 CoMFA 表征维沙考类似物作为囊泡乙酰胆碱转运蛋白的配体。

DOI:
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发表时间:
2008
影响因子:
7.3
通讯作者:
G. Schüürmann
G. Schüürmann
中科院分区:
医学1区
文献类型:
--
作者:
Andrzej Szymoszek;B. Wenzel;M. Scheunemann;J. Steinbach;G. Schüürmann

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Vesamicol衍生物作为囊泡乙酰胆碱转运体(VAChT)的配体,如果用作正电子发射断层扫描放射性示踪剂,可以实现胆碱能缺陷的体内成像。到目前为止,vesamicol型配体的结合亲和力的优化由于缺乏相应的定量构效关系而受到阻碍。我们建立了第一个定量模型,从分子结构上预测维萨米醇型配体对VAChT的结合亲和力,采用比较分子场分析(CoMFA)对37个配体进行了分析,涵盖了三种不同的结构类型(4-苯基哌啶、螺旋和维萨米醇的托聚糖衍生物)。预测能力通过留一交叉验证(LOO)进行评估,并通过忽略和预测所选化合物的50%,使训练集和预测集几乎涵盖了整个实验数据范围。统计数据表明,模型的预测能力显著(q (2) (LOO) = 0.66, q (2) (50% out) = 0.59-0.74)。讨论包括详细分析对配体- vacht结合至关重要的CoMFA区域,确定高结合亲和力的结构含义。
Vesamicol derivatives are promising candidates as ligands for the vesicular acetylcholine transporter (VAChT) to enable in vivo imaging of cholinergic deficiencies if applied as positron emission tomography radiotracers. So far, optimization of the binding affinity of vesamicol-type ligands was hampered by the lack of respective quantitative structure-activity relationships. We developed the first quantitative model to predict, from molecular structure, the binding affinity of vesamicol-type ligands toward VAChT employing comparative molecular field analysis (CoMFA) for a set of 37 ligands, covering three different structural types (4-phenylpiperidine, spiro, and tropan derivatives of vesamicol). The prediction capability was assessed by leave-one-out cross-validation (LOO) and through leaving out and predicting 50% of the compounds selected such that both the training and the prediction sets cover almost the whole range of experimental data. The statistics indicate a significant prediction power of the models ( q (2) (LOO) = 0.66, q (2) (50% out) = 0.59-0.74). The discussion includes detailed analyses of CoMFA regions critical for ligand-VAChT binding, identifying structural implications for high binding affinity.
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