Related Experiment Video
Updated: Jul 14, 2026
A Calcium Bioluminescence Assay for Functional Analysis of Mosquito Aedes aegypti and Tick Rhipicephalus microplus G Protein-coupled Receptors
Published on: April 20, 2011
A Comparative Analysis of Cockroach and Mosquito, Octopamine Receptor Homologues Produced Using Chimera, Swiss-Model,
Steve D Kamguia1, Eric N Njabon1, Issofa Patouossa1
1Laboratory of Applied Physical and Analytical Chemistry, Department of Inorganic Chemistry, Faculty of Sciences, University of Yaoundé 1, P.O. Box 812, Yaoundé 00237, Cameroon.
Homology modeling of insect octopamine receptors using AlphaFold models (AFM) and Swiss-Model models (SMM) showed structural validity, outperforming UCSF Chimera and Modeler models (CMM). Despite structural variations, binding affinities remain consistent, with AFM recommended for quaternary structure studies.
Area of Science:
- Structural biology
- Computational chemistry
- Insect molecular biology
Background:
- Homology modeling is crucial for predicting 3D protein structures from amino acid sequences.
- Octopamine receptors are vital targets for developing environmentally friendly insecticides against domestic pests.
- Tertiary structures for octopamine receptors in *Periplaneta americana* and *Culex quinquefasciatus* are not available in the Protein Data Bank (PDB).
Purpose of the Study:
- To build and evaluate homology models for octopamine receptor homologues from *Periplaneta americana* and *Culex quinquefasciatus*.
- To compare the structural validity and stability of models generated by AlphaFold, Swiss-Model, UCSF Chimera, and Modeler.
- To assess the potential impact of structural differences on ligand binding through docking studies.
Main Methods:
- Homology modeling was employed to construct 3D structures for target insect octopamine receptors.
- AlphaFold models (AFM), Swiss-Model models (SMM), and UCSF Chimera/Modeler models (CMM) were generated and compared.
- Structural validation was performed using superposition, ProSA web server, Ramachandran plots, and VADAR statistics.
- Molecular docking studies were conducted using UCSF Chimera software to evaluate binding site interactions and energies.
Main Results:
- AlphaFold models (AFM) demonstrated structural validity, aligning well with Swiss-Model models (SMM) for both cockroach and mosquito octopamine receptors.
- UCSF Chimera and Modeler models (CMM) showed significant discrepancies compared to AFM and SMM.
- Despite variations in structural details, docking studies indicated conserved binding site properties and similar binding energies across different models, suggesting functional equivalence for octopamine binding.
- AFM models were found to be more thermodynamically stable and preserved quaternary structure.
Conclusions:
- AlphaFold and Swiss-Model provide reliable homology models for insect octopamine receptors, crucial for insecticide development.
- Structural differences among homology models are unlikely to impede octopamine binding, but AFM is preferred for studies requiring intact quaternary structure.
- This research aids in the rational design of novel, eco-friendly insecticides targeting invertebrate octopamine receptors.
More Related Videos
09:09Physiological Recordings and RNA Sequencing of the Gustatory Appendages of the Yellow-fever Mosquito Aedes aegypti
Published on: December 30, 2014
12:21The Madagascar Hissing Cockroach as an Alternative Non-mammalian Animal Model to Investigate Virulence, Pathogenesis, and Drug Efficacy
Published on: November 24, 2017
