The University of Memphis, Department of Chemistry, USA.
The University of Memphis, Department of Biological Sciences, USA.
J Mol Graph Model. 2019 Jan;86:235-246. doi: 10.1016/j.jmgm.2018.10.016. Epub 2018 Oct 21.
G protein-coupled receptors (GPCR) are integral membrane proteins of considerable interest as targets for drug development. GPCR ligand interaction studies often have a starting point with either crystal structures or comparative models. The majority of GPCR do not have experimentally-characterized 3-dimensional structures, so comparative modeling, also called homology modeling, is a good structure-based starting point. Comparative modeling is a widely used method for generating models of proteins with unknown structures by analogy to crystallized proteins that are expected to exhibit structural conservation. Traditionally, comparative modeling template selection is based on global sequence identity and shared function. However high sequence identity localized to the ligand binding pocket may produce better models to examine protein-ligand interactions. This in silico benchmark study examined the performance of a global versus local similarity measure applied to comparative modeling template selection for 6 previously crystallized, class A GCPR (CXCR4, FFAR1, NOP, P2Y12, OPRK, and M1) with the long-term goal of optimizing GPCR ligand identification efforts. Comparative models were generated from templates selected using both global and local similarity measures. Similarity to reference crystal structures was reflected in RMSD values between atom positions throughout the structure or localized to the ligand binding pocket. Overall, models deviated from the reference crystal structure to a similar degree regardless of whether the template was selected using a global or local similarity measure. Ligand docking simulations were performed to assess relative performance in predicting protein-ligand complex structures and interaction networks. Calculated RMSD values between ligand poses from docking simulations and crystal structures indicate that models based on locally selected templates give docked poses that better mimic crystallographic ligand positions than those based on globally-selected templates in five of the six benchmark cases. However, protein model refinement strategies in advance of ligand docking applications are clearly essential as the average RMSD between crystallographic poses and poses docked into local template models was 9.7 Å and typically less than half of the ligand interaction sites are shared between the docked and crystallographic poses. These data support the utilization of local similarity measures to guide template selection in protocols using comparative models to investigate ligand-receptor interactions.
G 蛋白偶联受体 (GPCR) 是一种重要的膜蛋白,作为药物开发的靶点具有相当大的吸引力。GPCR 配体相互作用研究通常以晶体结构或比较模型为起点。大多数 GPCR 没有经过实验表征的三维结构,因此比较建模,也称为同源建模,是一个很好的基于结构的起点。比较建模是一种广泛使用的方法,用于通过类比预期具有结构保守性的结晶蛋白来生成未知结构的蛋白质模型。传统上,比较建模模板选择基于全局序列同一性和共享功能。然而,局部到配体结合口袋的高序列同一性可能会产生更好的模型来研究蛋白质-配体相互作用。这项基于计算机的基准研究检查了全局与局部相似性度量在比较建模模板选择中的应用,用于 6 个以前结晶的 A 类 GPCR(CXCR4、FFAR1、NOP、P2Y12、OPRK 和 M1),长期目标是优化 GPCR 配体鉴定工作。使用全局和局部相似性度量选择模板生成了比较模型。与参考晶体结构的相似性反映在整个结构或局部到配体结合口袋的原子位置之间的 RMSD 值上。总体而言,无论模板是使用全局还是局部相似性度量选择的,模型与参考晶体结构的偏差程度都相似。进行配体对接模拟以评估预测蛋白质-配体复合物结构和相互作用网络的相对性能。对接模拟中配体构象与晶体结构之间的计算 RMSD 值表明,在六个基准案例中的五个案例中,基于局部选择模板的模型产生的对接构象比基于全局选择模板的模型更好地模拟晶体配体位置。然而,在进行配体对接应用之前,蛋白质模型的细化策略显然是必不可少的,因为晶体构象和对接到局部模板模型中的构象之间的平均 RMSD 值为 9.7 Å,并且通常只有不到一半的配体相互作用位点在对接和晶体构象之间共享。这些数据支持利用局部相似性度量来指导模板选择,以使用比较模型研究配体-受体相互作用的协议。
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