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Lassa virus nucleoprotein (NP) interactions with RNA and Z protein were studied. RNA triggers NP disassembly, while Z protein binding to NP is pH-dependent, impacting Lassa virus assembly.

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Lassa virus is a negative-strand RNA virus causing outbreaks in West Africa.
  • Nucleoprotein (NP) forms ribonucleoprotein complexes (RNPs) with viral RNA and L protein, essential for replication and transcription.
  • Z protein mediates RNP membrane recruitment, assembly, and budding, interacting with L protein.

Purpose of the Study:

  • To characterize the interactions between Lassa virus NP, Z protein, and RNA.
  • To elucidate the role of RNA and pH in NP and Z protein complex formation.

Main Methods:

  • Utilized structural mass spectrometry to analyze Lassa virus NP, Z, and RNA interactions.
  • Investigated the effect of RNA presence on NP structure and Z-NP binding.
  • Assessed the pH-dependency of the Z-NP interaction.

Main Results:

  • RNA presence drives the disassembly of NP trimers into monomers, facilitating higher-order RNA-bound NP assemblies.
  • The interaction site between Z protein and NP was identified.
  • NP binds Z protein independently of RNA, but this interaction is pH-dependent.

Conclusions:

  • RNA binding induces conformational changes in Lassa virus NP, crucial for RNP formation.
  • The pH-dependent interaction between NP and Z protein influences RNP assembly and release.
  • These findings enhance understanding of Lassa virus RNP dynamics and replication mechanisms.