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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of computer aided molecular design 10 (1996), S. 513-520 
    ISSN: 1573-4951
    Keywords: CoMFA ; Electrotopological state ; QSAR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The derivation of a new 3D QSAR field based on the electrotopological state (E-state) formalism is described. A complementary index and its associated field, the HE-state, describing the polarity of hydrogens is also defined. These new fields are constructed from a nonempirical index that incorporates electronegativity, the inductive influence of neighboring atoms, and the topological state into a single atomistic descriptor. The classic CoMFA steroid test data set was examined with models incorporating the E-state and HE-state fields alone and in combination with steric, electrostatic and hydropathic fields. The single best model was the E-state/HE-state combination with q2=0.803 (three components) and r2=0.979. Using the E-state and/or HE-state fields with other fields consistently produced models with improved statistics, where the E-state fields provided a significant, if not dominant, contribution.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of computer aided molecular design 8 (1994), S. 83-96 
    ISSN: 1573-4951
    Keywords: Molecular Lipophilicity Potential ; MLP ; Quantitative structure-activity relationships ; QSAR ; Comparative Molecular Field Analysis ; CoMFA ; α1 ligands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new method is presented to calculate the Molecular Lipophilicity Potential (MLP). The method is validated by showing that the MLP thus generated on the solvent-accessible surface can be used to back-calculate log P. Because the MLP is shown to be sensitive to conformational effects, the MLP/log P relation is best sought by taking all conformers into account. The MLP method presented here can be used as a third field in CoMFA studies, as illustrated with two series of α1 ligands. In the first series, the steric, electrostatic and lipophilic fields are highly intercorrelated, and taken separately yield comparable models. In the second series of ligands, the best model is obtained with the lipophilic field alone, allowing insights into ligand-receptor interactions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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