Conserved Core Substructures in the Overlay of Protein鈥揕igand Complexes

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• 作者：Barry C. Finzel ; Ramprasad Akavaram ; Aravind Ragipindi ; Jeffrey R. Van Voorst ; Matthew Cahn ; Malcolm E. Davis ; Matt E. Pokross ; Steven Sheriff ; Eric T. Baldwin
• 刊名：Journal of Chemical Information and Modeling
• 出版年：2011
• 出版时间：August 22, 2011
• 年：2011
• 卷：51
• 期：8
• 页码：1931-1941
• 全文大小：1043K
• 年卷期：v.51,no.8(August 22, 2011)
• ISSN：1549-960X

文摘

The method of conserved core substructure matching (CSM) for the overlay of protein鈥搇igand complexes is described. The method relies upon distance geometry to align structurally similar substructures without regard to sequence similarity onto substructures from a reference protein empirically selected to include key determinants of binding site location and geometry. The error in ligand position is reduced in reoriented ensembles generated with CSM when compared to other overlay methods. Since CSM can only succeed when the selected core substructure is geometrically conserved, misalignments only rarely occur. The method may be applied to reliably overlay large numbers of protein鈥搇igand complexes in a way that optimizes ligand position at a specific binding site or subsite or to align structures from large and diverse protein families where the conserved binding site is localized to only a small portion of either protein. Core substructures may be complex and must be chosen with care. We have created a database of empirically selected core substructures to demonstrate the utility of CSM alignment of ligand binding sites in important drug targets. A Web-based interface can be used to apply CSM to align large collections of protein鈥搇igand complexes for use in drug design using these substructures or to evaluate the use of alternative core substructures that may then be shared with the larger user community. Examples show the benefit of CSM in the practice of structure-based drug design.