Abstract
Multiple receptors conformation docking (MRCD) and clustering of dock poses allows seamless incorporation of receptor binding conformation of the molecules on wide range of ligands with varied structural scaffold. The accuracy of the approach was tested on a set of 120 cyclic urea molecules having HIV-1 protease inhibitory activity using 12 high resolution X-ray crystal structures and one NMR resolved conformation of HIV-1 protease extracted from protein data bank. A cross validation was performed on 25 non-cyclic urea HIV-1 protease inhibitor having varied structures. The comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA) models were generated using 60 molecules in the training set by applying leave one out cross validation method, r 2loo values of 0.598 and 0.674 for CoMFA and CoMSIA respectively and non-cross validated regression coefficient r2 values of 0.983 and 0.985 were obtained for CoMFA and CoMSIA respectively. The predictive ability of these models was determined using a test set of 60 cyclic urea molecules that gave predictive correlation (r 2pred ) of 0.684 and 0.64 respectively for CoMFA and CoMSIA indicating good internal predictive ability. Based on this information 25 non-cyclic urea molecules were taken as a test set to check the external predictive ability of these models. This gave remarkable out come with r 2pred of 0.61 and 0.53 for CoMFA and CoMSIA respectively. The results invariably show that this method is useful for performing 3D QSAR analysis on molecules having different structural motifs.
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Acknowledgments
We gratefully acknowledge support for this research from Department of Science and Technology, New Delhi, India, University Grants Commission, New Delhi, India and Department of chemistry, Nizam College, Hyderabad, India. We are greatly thankful to Dr. G. N. Shastry, Scientist, Indian Institute of Chemical Technology for Sybyl 6.9 software and his useful suggestions. We also acknowledge Schrödinger Inc. for GLIDE software.
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Sivan, S.K., Manga, V. Multiple receptor conformation docking and dock pose clustering as tool for CoMFA and CoMSIA analysis – a case study on HIV-1 protease inhibitors. J Mol Model 18, 569–582 (2012). https://doi.org/10.1007/s00894-011-1048-x
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DOI: https://doi.org/10.1007/s00894-011-1048-x