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Oligomeric HIV-1 Integrase Structures Reveal Functional Plasticity for Intasome Assembly and RNA Binding.

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HIV-1 integrase (IN) uses its plasticity to form different structures for viral DNA integration and RNA binding. These findings reveal IN

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Area of Science:

  • Structural biology
  • Virology
  • Molecular biology

Background:

  • HIV-1 integrase (IN) is essential for viral replication, performing distinct roles in DNA integration and viral RNA binding.
  • The molecular structures of IN assemblies mediating these functions are not fully understood.
  • The IN tetramer is a key target for developing allosteric inhibitors.

Purpose of the Study:

  • To determine the cryo-EM structures of HIV-1 IN tetramers and intasome hexadecamers.
  • To elucidate the molecular mechanisms underlying IN's diverse oligomeric forms and functions.
  • To provide atomic insights for the development of novel antiviral therapies.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to determine high-resolution structures.
  • Biochemical assays to investigate IN function and oligomerization.
  • Mutagenesis studies to probe critical interfaces and functional roles.

Main Results:

  • Determined cryo-EM structures of HIV-1 IN tetramers and intasome hexadecamers.
  • Revealed structural plasticity in IN, utilizing C-terminal domains and linkers for distinct oligomeric assemblies.
  • Identified a conserved interface crucial for both IN functions, linking them to tetramerization.

Conclusions:

  • HIV-1 IN's plasticity allows assembly into functionally distinct oligomeric states.
  • IN tetramerization is critical for both viral DNA integration and RNA binding.
  • The findings offer atomic blueprints for designing allosteric IN inhibitors.