Structural dynamics of full-length retroviral integrase: a molecular dynamics analysis

Area of Science:

• Structural Biology
• Virology
• Biophysics

Background:

• HIV integrase is essential for viral replication, catalyzing DNA integration.
• Understanding full-length integrase structure and dynamics is key to developing antiviral strategies.
• Inter-domain communication influences HIV integration and disintegration processes.

Purpose of the Study:

• To analyze the global dynamics of full-length HIV integrase (dimer and monomers) using molecular dynamics simulations.
• To investigate the role of the C-terminal domain and C-loop in integrase structural dynamics.
• To elucidate the functional dynamics of the integrase dimer and its domains.

Main Methods:

• Molecular dynamics (MD) simulations of full-length integrase (dimer and monomers) for 20 ns.
• DynDom analysis to study domain movements and interactions.
• Comparative analysis of integrase dynamics with and without the C-terminal domain (amino acids 270-288) and C-loop.

Main Results:

• Dimeric integrase exhibits stable dynamics of the catalytic core domain (CCD) and N-terminal domain (NTD).
• A CCD-α11-mediated motion governs the C-terminal domain (CTD) dynamics in the integrase dimer, suggesting aggregation enhances activity.
• The C-loop is essential for maintaining the spatial arrangement of integrase domains during dynamics.

Conclusions:

• HIV integrase exhibits C-loop-dependent structural dynamics.
• Integrase dimerization promotes active dynamics, crucial for its function.
• Further research on C-loop sensing and multimerization could yield new HIV therapeutic targets.