Molecular mechanics models for tetracycline analogs

Area of Science:

• Computational chemistry
• Molecular modeling
• Drug discovery

Background:

• Tetracyclines (Tcs) are vital antibiotics targeting ribosomal and protein interactions.
• Accurate molecular modeling is essential for understanding Tc mechanisms of action.

Purpose of the Study:

• To develop a molecular mechanics force field for 12 tetracycline variants.
• To model tetracycline interactions with proteins and RNA.

Main Methods:

• Developed a CHARMM-consistent force field for 12 tetracyclines.
• Utilized ab initio methods and simulated annealing for conformational analysis.
• Derived intermolecular parameters using a supermolecule approach.

Main Results:

• Identified stable zwitterionic-extended conformations for Tcs in solution.
• Achieved a low root-mean-square deviation (0.35 kcal/mol) between ab initio and force field energies.
• Successfully reproduced ab initio geometry and flexibility for each Tc.

Conclusions:

• The developed force field accurately models tetracycline behavior.
• Enables further simulations of Tc-protein and Tc-RNA interactions.
• Provides a valuable tool for antibiotic research and drug design.