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Quantitative structure-activity relationship study using refractotopological state atom index on some neonicotinoid

Bikash Debnath1, Shovanlal Gayen, Anindya Basu

  • 1Division of Medicinal and Pharmaceutical Chemistry, Department of Pharmaceutical Technology, PO Box No 17020, Jadavpur University, Kolkata 700 032, India.

Bioorganic & Medicinal Chemistry
|November 3, 2004
PubMed
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The refractotopological state (R-state) atom index effectively identifies key structural features in neonicotinoids for receptor binding. This new QSAR tool aids in understanding insecticidal activity and predicting neonicotinoid efficacy.

Area of Science:

  • * Computational chemistry
  • * Cheminformatics
  • * Molecular modeling

Background:

  • * Atom-level topological descriptors, such as the electrotopological state (E-state) atom index, are increasingly vital in Quantitative Structure-Activity Relationship (QSAR) studies.
  • * These descriptors facilitate the correlation of molecular structure with biological activity at the atomic or fragmental level.
  • * Previous research demonstrated the utility of the E-state index for certain azidopyridinyl neonicotinoid insecticides.

Purpose of the Study:

  • * To introduce and validate the refractotopological state (R-state) atom index, a novel atom-level topological descriptor, for QSAR analysis.
  • * To identify critical atoms or fragments involved in the dispersive/van der Waals interactions between neonicotinoids and the nicotinic acetylcholine receptor (nAChR).
  • * To elucidate the structural requirements for agonistic activity at mammalian alpha(4)beta(2) and Drosophila nAChR.

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Main Methods:

  • * Application of the refractotopological state (R-state) atom index to analyze neonicotinoid structures.
  • * Correlation of R-state index values with observed agonistic activity at mammalian and insect nAChRs.
  • * Identification of structural motifs influencing selective insecticidal activity.

Main Results:

  • * The R-state index successfully identified key atoms and fragments associated with dispersive interactions in neonicotinoids.
  • * Structural requirements for mammalian alpha(4)beta(2) and Drosophila nAChR agonistic activity were elucidated.
  • * Substituted imine and nitromethylene groups at the X-position were found to confer selective insecticidal activity.
  • * Azido substitution on the pyridine ring was observed to reduce binding affinity to the receptors.

Conclusions:

  • * The refractotopological state (R-state) atom index is confirmed as a valuable new tool for QSAR studies.
  • * The R-state index demonstrates efficacy in pinpointing essential structural features for receptor binding and predicting neonicotinoid activity.
  • * This approach provides insights into the molecular mechanisms underlying neonicotinoid action and selectivity.