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Mechanism of HIV-1 Capsid Rupture and Uncoating by Reverse Transcription.

Kuntal Ghosh1, Manish Gupta1, Gregory A Voth1

  • 1Department of Chemistry, Chicago Center for Theoretical Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Illinois 60637, USA.

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Summary

Researchers developed a new computational method to simulate HIV-1 reverse transcription within the viral capsid. This simulation reveals diverse capsid rupture pathways crucial for viral infection, differing from simple pressure models.

Keywords:
HIV-1capsid uncoatingcoarse-grainingmolecular dynamicsreverse transcription

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Area of Science:

  • Virology
  • Computational Biology
  • Structural Biology

Background:

  • Reverse transcription is a critical step in the human immunodeficiency virus type 1 (HIV-1) life cycle, converting viral RNA into DNA within the protective capsid.
  • Capsid rupture, or uncoating, is essential for releasing viral genetic material into the host cell nucleus, but its mechanisms are not fully understood.

Purpose of the Study:

  • To develop and apply a multiscale computational method for simulating HIV-1 reverse transcription and capsid rupture.
  • To elucidate the mechanistic and kinetic details of capsid rupture during reverse transcription.

Main Methods:

  • Development of a Coarse-Grained Kinetic Monte Carlo (CG-KMC) method to simulate stepwise DNA synthesis within a coarse-grained HIV-1 capsid model.
  • Integration of CG-KMC with a "bottom-up" capsid model and a "top-down" viral genome representation.
  • Analysis of capsid rupture pathways, kinetics, and the influence of capsid-DNA interactions.

Main Results:

  • The CG-KMC simulations successfully captured and predicted diverse capsid rupture pathways during reverse transcription.
  • Simulated ruptured structures closely resembled those observed in cryo-electron tomography (cryo-ET) images.
  • Distinct rupture pathways were identified based on varying capsid-DNA conditions, differing from simple pressure-driven models.

Conclusions:

  • The developed CG-KMC method provides a powerful tool for studying HIV-1 reverse transcription and uncoating.
  • Capsid rupture is a complex process influenced by capsid-DNA interactions, not solely by internal pressure.
  • Findings offer new insights into the HIV-1 life cycle and potential targets for antiviral strategies.