QSAR. Quantative Structure-Activity Relationships. Why QSAR?. The number of compounds required for synthesis in order to place 10 different groups in 4 positions of benzene ring is 10 4
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Quantative Structure-Activity Relationships
Input: n descriptors P1,..Pn and the value of biological activity (EC50 for example) for m compounds.
Biological activity = C0+(C1*P1)+...+(Cn*Pn)
and the prediction error is minimized for a list of given m compounds.
Steric (Lennard-Jones) interactions
Electrostatic (Coulombic) interactions
Maps of electrostatic fields: BLUE - positive chargesRED - negative charges
Maps of steric fields:GREEN - space filling areas for best KdYELLOW - space conflicting areas
The VolSurf program predicts a variety of ADME properties based on pre-calculated models. The models included are:
hydrophobic (blue) and hydrophilic (red) surface area of diazepam.
Feature-based pharmacophore modeling:
Activity-based pharmacophore modeling:
Hydrophobic area, h-bond donor, 2 h-bond acceptors
Saquinavir (most active compound) fitted to pharmacophore
3 hydrophobic areas, h-bond acceptor
7-ethoxy-4-trifluoromethylcoumarin fitted to pharmacophore
conformations should be scored
conformations passing the filter
pKi = – c – x (vdW_Exact/ Grid_Soft)
+ y (C+_pol)
– z (Totpol^ 2)