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A 2-Hydroxyisoquinoline-1,3-Dione Active-Site RNase H Inhibitor Binds in Multiple Modes to HIV-1 Reverse

Karen A Kirby1,2, Nataliya A Myshakina3,4, Martin T Christen5

  • 1Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, USA kirbyk@missouri.edu sarafianoss@missouri.edu.

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|August 2, 2017
PubMed
Summary
This summary is machine-generated.

A novel inhibitor, YLC2-155, targets the essential RNase H function of HIV-1 reverse transcriptase. This compound shows greater efficacy against RNase H than polymerase activity, offering a potential therapeutic strategy.

Keywords:
RNase Hhuman immunodeficiency virusinhibitorreverse transcriptase

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Area of Science:

  • Biochemistry
  • Virology
  • Medicinal Chemistry

Background:

  • The RNase H (RNH) function of HIV-1 reverse transcriptase (RT) is critical for the virus's replication cycle.
  • Developing specific inhibitors for RNH is a key strategy in HIV-1 therapy.

Purpose of the Study:

  • To characterize YLC2-155, a novel 2-hydroxyisoquinoline-1,3-dione (HID)-based inhibitor targeting the RNH active site.
  • To evaluate the inhibitory potential of YLC2-155 against both polymerase and RNH functions of HIV-1 RT.

Main Methods:

  • In vitro enzyme inhibition assays to determine IC50 values for polymerase and RNH functions.
  • X-ray crystallography to elucidate the binding mode of YLC2-155.
  • Nuclear Magnetic Resonance (NMR) analysis.
  • Molecular modeling studies.

Main Results:

  • YLC2-155 demonstrated inhibitory activity against both RT polymerase (IC50 = 2.6 μM) and RNH (IC50 = 0.65 μM) functions.
  • The inhibitor exhibited significantly higher potency against the RNH function compared to the polymerase function.
  • Structural analyses revealed that YLC2-155 binds to the RNH active site in diverse conformational states.

Conclusions:

  • YLC2-155 is a potent inhibitor of the HIV-1 RT RNase H function.
  • Its dual inhibitory activity, with a preference for RNH, makes it a promising candidate for further development as an anti-HIV agent.
  • The observed multiple binding conformations may inform the design of next-generation RNH inhibitors.