LAMR1 restricts Zika virus infection by attenuating the envelope protein ubiquitination

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Zika virus (ZIKV) poses significant public health risks, causing severe neurological conditions like microcephaly and Guillain-Barre syndrome.
• Understanding host-pathogen interactions is crucial for developing effective antiviral strategies against ZIKV.

Purpose of the Study:

• To identify novel host factors that confer resistance against Zika virus infection.
• To elucidate the molecular mechanism by which laminin receptor 1 (LAMR1) inhibits ZIKV replication.

Main Methods:

• Investigated the interaction between LAMR1 and ZIKV envelope (E) protein using molecular binding assays.
• Assessed the role of LAMR1 in modulating E protein ubiquitination by employing co-immunoprecipitation and Western blotting.
• Utilized site-directed mutagenesis to identify key residues involved in the LAMR1-E protein interaction.

Main Results:

• Identified laminin receptor 1 (LAMR1) as a novel host resistance factor against ZIKV.
• Demonstrated that LAMR1 binds to the ZIKV envelope (E) protein via its intracellular region, recruiting eukaryotic translation initiation factor 3 subunit 5 (EIF3S5) to attenuate E protein ubiquitination.
• Showed that the conserved G282 residue in the ZIKV E protein is critical for LAMR1 binding and subsequent deubiquitination.

Conclusions:

• LAMR1 effectively represses ZIKV infection by directly interacting with the viral E protein.
• The mechanism involves LAMR1-mediated deubiquitination of the E protein, highlighting a new antiviral pathway.
• Targeting the LAMR1-E protein interaction could represent a potential therapeutic strategy against ZIKV.