Calculation of hydrophobic parameters directly from three-dimensional structures using comparative molecular field...

Area of Science:

• Computational Chemistry
• Medicinal Chemistry
• Quantitative Structure-Property Relationships (QSPR)

Background:

• Hydrophobicity (log k') is a key molecular descriptor influencing drug absorption, distribution, metabolism, and excretion.
• Accurate prediction of hydrophobicity is essential for efficient drug discovery and chemical development.
• Existing methods for hydrophobicity assessment can be resource-intensive or require experimental data.

Purpose of the Study:

• To develop and validate a computational method for predicting hydrophobicity (log k') values of furans and triazines.
• To assess the accuracy of the comparative molecular field analysis (CoMFA) approach for hydrophobicity prediction.
• To correlate predicted log k' values with experimental data and established partition coefficients (log P).

Main Methods:

• Utilized comparative molecular field analysis (CoMFA) to analyze 3D structures of 17 furans and 54 triazines.
• Employed the H2O probe and GRID force field, incorporating hydrogen-bond potentials, for calculations.
• Validated predictions using 14 additional triazine analogs and compared with literature log k' values and log P for furans.

Main Results:

• Achieved excellent correlations between calculated and experimental log k' values for furans and triazines.
• Demonstrated high accuracy in predicting log k' for novel triazine analogs.
• Observed similar high accuracy for predicting octanol-water partition coefficients (log P) of furans.

Conclusions:

• The CoMFA approach, using specific probes and force fields, is a reliable method for predicting hydrophobicity (log k') from 3D structures.
• This computational strategy offers an efficient alternative to experimental measurements for assessing molecular hydrophobicity.
• The validated method can be applied to predict physicochemical properties of diverse chemical compounds, aiding in rational molecular design.