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Related Experiment Video

Updated: Jan 20, 2026

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
05:46

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Conformational Changes in HIV-1 Reverse Transcriptase that Facilitate Its Maturation.

Ryan L Slack1, Tatiana V Ilina1, Zhaoyong Xi1

  • 1Department of Structural Biology, University of Pittsburgh School of Medicine, Room 1037, Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA 15260, USA.

Structure (London, England : 1993)
|September 1, 2019
PubMed
Summary

Transfer RNA (tRNA) binding to HIV-1 reverse transcriptase (RT) induces structural changes essential for its maturation. Modulating tRNA levels and using inhibitors confirmed tRNA's critical role in HIV-1 protease (PR) cleavage.

Keywords:
HIV-1NMRmaturationreverse transcriptasestructure

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • HIV-1 reverse transcriptase (RT) is a key enzyme for viral replication, synthesized as part of the Gag-Pol polyprotein.
  • Proteolytic processing by HIV-1 protease (PR) is crucial for generating mature, functional RT, a heterodimer of p66 and p51 subunits.
  • Previous studies indicated that tRNALys3 binding influences RT conformation and subsequent PR cleavage.

Purpose of the Study:

  • To characterize the conformational changes in the ribonuclease (RNH) domain of p66/p66 induced by tRNALys3 binding using Nuclear Magnetic Resonance (NMR).
  • To confirm the role of tRNALys3 in HIV-1 RT maturation in cellulo.
  • To investigate the impact of nonnucleoside RT inhibitors on the p66 dimer-monomer equilibrium and structural changes.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to analyze structural changes in the RNH domain of p66/p66 upon tRNALys3 binding.
  • In cellulo experiments modulating Lys-tRNA synthetase levels to affect tRNALys3 recruitment to the virus.
  • Utilizing nonnucleoside RT inhibitors to alter the p66 dimer-monomer equilibrium and observe structural consequences.

Main Results:

  • NMR data revealed specific conformational changes in the RNH domain of p66/p66 induced by tRNALys3.
  • Modulation of Lys-tRNA synthetase levels in cellulo confirmed the essential role of tRNALys3 in viral RT maturation.
  • Nonnucleoside RT inhibitors were used to probe the relationship between p66 dimerization and structural alterations.

Conclusions:

  • tRNALys3 binding induces critical conformational changes in the HIV-1 RT p66/p66 form, facilitating its cleavage by HIV-1 protease.
  • These findings highlight the importance of tRNA-protein interactions in the intricate process of viral enzyme maturation.
  • The study provides novel structural insights into the mechanisms governing HIV-1 RT processing and maturation.