title: Improving the quality of 3D-QSAR by using flexible-ligand receptor models.
abstract: To address the problems associated with molecular conformations and alignments in the 3D-QSAR studies, we have developed the Flexible Ligand - Atomic Receptor Model (FLARM) 2.0 method. The FLARM 2.0 method has three unique features as compared to other pseudoreceptor model methods: (1) the training ligands are flexibly optimized inside the receptors to achieve minimal docking energies; (2) the receptor atoms are spatially moveable in the process of genetic evolving in order to avoid improper initial receptor shapes; and (3) void receptor sites are specially favored in order to obtain open receptor models that allow large gaps. Advantages of an open model include less noise information, a smaller risk of overfitting, and ease of locating the key interaction sites. The latter two features, inherited from the previous FLARM 1.0 method, can improve the predictive ability of the 3D-QSAR models, while the first feature is newly implemented to relieve the uncertainty caused by improper conformation and alignment. Three FLARM 2.0 case studies were performed, and the results show that FLARM 2.0 models are highly predictive and robust. FLARM 2.0 pseudoreceptor models can correspond well with the pharmacophore models and/or the binding sites of the real protein receptors.
authors.affiliation: State Key Laboratory for Structural Chemistry of Stable and Unstable Species, College of Chemistry and Molecular Engineering and Center for Theoretical Biology, Peking University, Beijing 100871, China.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Pei
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Zhenming
authors.initials: Z
authors.lastname: Liu
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Han
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Bin
authors.initials: B
authors.lastname: Shen
authors.forename: Jiaju
authors.initials: J
authors.lastname: Zhou
authors.forename: Luhua
authors.initials: L
authors.lastname: Lai
mesh_terms: D000465:Algorithms; D000818:Animals; D001665:Binding Sites; D052246:Cyclooxygenase 2 Inhibitors / Q000737:chemistry / Q000494:pharmacology; D018756:GABA Antagonists / Q000494:pharmacology; D006860:Hydrogen Bonding; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D021281:Quantitative Structure-Activity Relationship; D051381:Rats; D011955:Receptors, Drug / Q000737:chemistry*; D018079:Receptors, GABA / Q000187:drug effects; D012984:Software; D013256:Steroids / Q000737:chemistry / Q000494:pharmacology
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D018756:GABA Antagonists; D008024:Ligands; D011955:Receptors, Drug; D018079:Receptors, GABA; D013256:Steroids