QSAR study on phosphoramidothioate (Ace) toxicities in housefly

Area of Science:

• * Cheminformatics and computational toxicology.
• * Molecular modeling and quantitative structure-activity relationships (QSARs).

Background:

• * Phosphoramidothioates, including Ace II analogs, are compounds of interest for their biological activity.
• * Understanding the relationship between chemical structure and biological activity is crucial for designing safer and more effective compounds.

Purpose of the Study:

• * To formulate quantitative structure-activity relationships (QSARs) for phosphoramidothioate (Ace II) analogs.
• * To identify key molecular descriptors governing the inhibition of fly-acetylcholinesterase and the toxicity (LD50) of these compounds.
• * To model the lipophilicity of the studied phosphoramidothioates.

Main Methods:

• * Development of QSAR models using distance-based topological and information theoretic indices.
• * Analysis of kinetic parameters (k(e)) for acetylcholinesterase inhibition.
• * Determination of median lethal dose (LD50) values for housefly toxicity.
• * Validation of model predictive ability using cross-validation techniques.

Main Results:

• * QSAR models incorporating topological and information theoretic indices accurately predicted Ace II analog activity.
• * The models successfully explained variations in acetylcholinesterase inhibition (k(e)) and housefly LD50.
• * Lipophilicity of the phosphoramidothioates was also effectively modeled.
• * Excellent predictive results were achieved across all developed models.

Conclusions:

• * Distance-based topological and information theoretic indices are effective predictors for phosphoramidothioate analog activity.
• * The developed QSAR models provide valuable insights into the structure-activity relationships of Ace II analogs.
• * These findings can guide the design of novel phosphoramidothioates with improved efficacy and safety profiles.