Bypassing pan-enterovirus host factor PLA2G16

Nat Commun. 2019 Jul 18;10(1):3171. doi: 10.1038/s41467-019-11256-z.

Abstract

Enteroviruses are a major cause of human disease. Adipose-specific phospholipase A2 (PLA2G16) was recently identified as a pan-enterovirus host factor and potential drug target. In this study, we identify a possible mechanism of PLA2G16 evasion by employing a dual glycan receptor-binding enterovirus D68 (EV-D68) strain. We previously showed that this strain does not strictly require the canonical EV-D68 receptor sialic acid. Here, we employ a haploid screen to identify sulfated glycosaminoglycans (sGAGs) as its second glycan receptor. Remarkably, engagement of sGAGs enables this virus to bypass PLA2G16. Using cryo-EM analysis, we reveal that, in contrast to sialic acid, sGAGs stimulate genome release from virions via structural changes that enlarge the putative openings for genome egress. Together, we describe an enterovirus that can bypass PLA2G16 and identify additional virion destabilization as a potential mechanism to circumvent PLA2G16.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line, Tumor
  • Cryoelectron Microscopy
  • Enterovirus D, Human / genetics
  • Enterovirus D, Human / growth & development*
  • Enterovirus Infections / pathology
  • Genome, Viral / genetics
  • Glycosaminoglycans / metabolism*
  • HEK293 Cells
  • HeLa Cells
  • Humans
  • N-Acetylneuraminic Acid / metabolism
  • Phospholipases A2, Calcium-Independent / metabolism*
  • Receptors, Virus / metabolism*
  • Tumor Suppressor Proteins / metabolism*
  • Virus Internalization*
  • Virus Uncoating / physiology*

Substances

  • Glycosaminoglycans
  • Receptors, Virus
  • Tumor Suppressor Proteins
  • PLAAT3 protein, human
  • Phospholipases A2, Calcium-Independent
  • N-Acetylneuraminic Acid