Subcellular location and topology of severe acute respiratory syndrome coronavirus envelope protein

Virology. 2011 Jul 5;415(2):69-82. doi: 10.1016/j.virol.2011.03.029. Epub 2011 Apr 27.

Abstract

Severe acute respiratory syndrome (SARS) coronavirus (CoV) envelope (E) protein is a transmembrane protein. Several subcellular locations and topological conformations of E protein have been proposed. To identify the correct ones, polyclonal and monoclonal antibodies specific for the amino or the carboxy terminus of E protein, respectively, were generated. E protein was mainly found in the endoplasmic reticulum-Golgi intermediate compartment (ERGIC) of cells transfected with a plasmid encoding E protein or infected with SARS-CoV. No evidence of E protein presence in the plasma membrane was found by using immunofluorescence, immunoelectron microscopy and cell surface protein labeling. In addition, measurement of plasma membrane voltage gated ion channel activity by whole-cell patch clamp suggested that E protein was not present in the plasma membrane. A topological conformation in which SARS-CoV E protein amino terminus is oriented towards the lumen of intracellular membranes and carboxy terminus faces cell cytoplasm is proposed.

Publication types

  • Research Support, American Recovery and Reinvestment Act
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Chlorocebus aethiops
  • Endoplasmic Reticulum / metabolism
  • Endoplasmic Reticulum / virology
  • Golgi Apparatus / metabolism
  • Golgi Apparatus / virology
  • Humans
  • Intracellular Space / metabolism
  • Intracellular Space / virology*
  • Molecular Sequence Data
  • Protein Transport
  • SARS Virus / genetics
  • SARS Virus / metabolism*
  • Severe Acute Respiratory Syndrome / metabolism
  • Severe Acute Respiratory Syndrome / virology*
  • Vero Cells
  • Viral Envelope Proteins / genetics
  • Viral Envelope Proteins / metabolism*

Substances

  • E protein, SARS coronavirus
  • Viral Envelope Proteins