Nahid Abbas and Sonal Dubey Author(s) AddressN Title QUMED 9th Annual Research Day QSAR studies on quinolonyl diketo acid derivatives Nahid Abbas and Sonal Dubey Results (including illustrations) Introduction / Background A 3D-quantitative structure activity relationship study on some newly synthesized quinolonyl diketo acid derivatives possessing integrase inhibitory, antiviral and cytotoxicity activity was done. The result presented herein provides QSAR models developed using MLRA, PCA, PCR and PLS analysis. The QSAR models obtained have shown significant correlations in terms of r2, q2, s2 and F-values. The models have been validated internally and externally; and shown good predictive ability. Electrostatic descriptors have come out to be the important ones regulating the activity of bifunctional quinolonyl diketo acid derivatives. Figure 1: The regression plot of strand transfer inhibitor activity, inset is a residual plot. Figure 2:The regression plot of 3’Processing inhibitor activity, inset is a residual plot Figure 3 : PCA plot of strand transfer inhibitor activity Figure 4 : PCA plot of 3’-processing inhibitor activity Strand transferActivity = -0.4670 + 0.5319 *T_C_N_2 + 0.0246* Qudrapole2 -0.7936*Sssch0count 3’P Activity=0.05566-1.1422*SsschO count Antiviral Activity=-3.7251 + 1.4809 * Chlorine count 27.389 1 * SAMostHydrophilic Cytotoxicity Activity=4.2502+0.02*-vePotential Surface area Figure 2: The regression plot of 3’Processing inhibitor activity, inset is a residual plot   QSAR EQUATION r2 q2 F-value p<   STRAND TRANSFER 0.73 0.6524 24.6 0.005 3’P 0.57 -0.256 13.3 ANTIVIRAL 0.91 0.8433 82.5 CYTOTOXICITY 0.82 0.5110 14.5 Discussion / conclusions From the result of Codessa Software it can be suggested that the WHIM, Topological, RDF, 2D autocorrelations, Electrostatic, Getaway and 3D Morse descriptors are statistically significant. Correlations ranging between 0.8705-0.9931 were found in this study which is highly significant. These models hold good predictive performance with q2 values ranging between 0.7201-0.9624 which was calculated by using LOO method. Objectives To do a 3D-quantitative structure activity relationship study on some newly synthesized quinolonyl diketo acid derivatives possessing integrase inhibitory, antiviral and cytotoxicity activity. usingDragon and Codessa software. Methodology Some novel bifunctional quinolonyl diketo acid derivatives as HIV-1 integrase inhibitors were selected.Then 3-D structures of reasonable conformations were generated from 2D structures. QSAR studies were performed on 25 novel bifunctional quinolonyl diketoacid derivatives as HIV-1 integrase inhibitors having strand transfer inhibitor activity,5, 3’-processing inhibitor activity. Structure of compounds was graphically drawn on the monitor using chemdraw. With the help of CHEM 3D, the different 2D structures are converted to 3D structures. Dragon software provides molecular descriptors but does not perform QSAR analysis. So various descriptors using Dragon software and V-life soft ware. References 1. Hansch, C.; Leo, A. Substituent Constants for Correlation Analysis in Chemistry and Biology, John Wiley & Sons, New York, 1979. 2. Livingstone, D.J. J. Chem. Inf. Comput. Sci. 2000, 40, 195-99. 3. Hansch, C.; Kurup, A.; Garg, R.; Gao, H. Chem. Rev. 2001, 101, 619-24. 4. Mehanna, A. S. Rationale of Design of anti-HIV Drugs.In Burger’s Medicinal Chemistry and Drug Discovery, 6th ed., VOL 5, Burger A, Abraham, DJ, Andrako J, Block JH, Borchardt RT, Abraham Ed, A John Wiley and Sons, Inc., Publication: New Jersey, 2003; 457-84. 5. Santo, R. D.; Costi, R; Roux, A.;. Artico, M. ; Lavecchia, A. ;Marinelli, L.; Novellino, E. ; Palmisano, L. ;Andreotti, M..; Amici, R.. ; Galluzzo, C. M.; Nencioni, L. Palamara, A.; Pommier, Y.; Marchand, C. Novel Bifunctional Quinolonyl Diketo acid derivatives as HIV-1 Integrase Inhibitors: Design, Synthesis, Biological activities, and Mechanism of action. J. Med Chem. 2006,49, 1939-194.