Structural basis for SARS-CoV-2 envelope protein recognition of human cell junction protein PALS1

Nat Commun. 2021 Jun 8;12(1):3433. doi: 10.1038/s41467-021-23533-x.

Abstract

The COVID-19 pandemic, caused by the SARS-CoV-2 virus, has created global health and economic emergencies. SARS-CoV-2 viruses promote their own spread and virulence by hijacking human proteins, which occurs through viral protein recognition of human targets. To understand the structural basis for SARS-CoV-2 viral-host protein recognition, here we use cryo-electron microscopy (cryo-EM) to determine a complex structure of the human cell junction protein PALS1 and SARS-CoV-2 viral envelope (E) protein. Our reported structure shows that the E protein C-terminal DLLV motif recognizes a pocket formed exclusively by hydrophobic residues from the PDZ and SH3 domains of PALS1. Our structural analysis provides an explanation for the observation that the viral E protein recruits PALS1 from lung epithelial cell junctions. In addition, our structure provides novel targets for peptide- and small-molecule inhibitors that could block the PALS1-E interactions to reduce E-mediated virulence.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Coronavirus Envelope Proteins / chemistry*
  • Coronavirus Envelope Proteins / metabolism*
  • Coronavirus Envelope Proteins / ultrastructure
  • Cryoelectron Microscopy
  • Humans
  • Intercellular Junctions / metabolism*
  • Membrane Proteins / metabolism*
  • Nucleoside-Phosphate Kinase / metabolism*
  • Protein Domains
  • SARS-CoV-2 / physiology
  • Structural Homology, Protein
  • Structure-Activity Relationship

Substances

  • Coronavirus Envelope Proteins
  • Membrane Proteins
  • envelope protein, SARS-CoV-2
  • Nucleoside-Phosphate Kinase
  • MPP5 protein, human