title: Role of receptor-mediated endocytosis in the formation of vaccinia virus extracellular enveloped particles.
abstract: Infectious intracellular mature vaccinia virus particles are wrapped by cisternae, which may arise from trans-Golgi or early endosomal membranes, and are transported along microtubules to the plasma membrane where exocytosis occurs. We used EH21, a dominant-negative form of Eps15 that is an essential component of clathrin-coated pits, to investigate the extent and importance of endocytosis of viral envelope proteins from the cell surface. Several recombinant vaccinia viruses that inducibly or constitutively express an enhanced green fluorescent protein (GFP)-EH21 fusion protein were constructed. Expression of GFP-EH21 blocked uptake of transferrin, a marker for clathrin-mediated endocytosis, as well as association of adaptor protein-2 with clathrin-coated pits. When GFP-EH21 was expressed, there were increased amounts of viral envelope proteins, including A33, A36, B5, and F13, in the plasma membrane, and their internalization was inhibited. Wrapping of virions appeared to be qualitatively unaffected as judged by electron microscopy, a finding consistent with a primary trans-Golgi origin of the cisternae. However, GFP-EH21 expression caused a 50% reduction in released enveloped virions, decreased formation of satellite plaques, and delayed virus spread, indicating an important role for receptor-mediated endocytosis. Due to dynamic interconnection between endocytic and exocytic pathways, viral proteins recovered from the plasma membrane could be used by trans-Golgi or endosomal cisternae to form new viral envelopes. Adherence of enveloped virions to unrecycled viral proteins on the cell surface may also contribute to decreased virus release in the presence of GFP-EH21. In addition to a salvage function, the retrieval of viral proteins from the cell surface may reduce immune recognition.
authors.affiliation: Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-0445, USA.
authors.forename: Matloob
authors.initials: M
authors.lastname: Husain
authors.forename: Bernard
authors.initials: B
authors.lastname: Moss
mesh_terms: D033962:Adaptor Protein Complex 2 / Q000378:metabolism; D048868:Adaptor Proteins, Signal Transducing; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism; D002462:Cell Membrane / Q000737:chemistry; D004705:Endocytosis / Q000502:physiology*; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008562:Membrane Glycoproteins / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism; D008854:Microscopy, Electron; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D014168:Transferrin / Q000378:metabolism; D014616:Vaccinia virus / Q000502:physiology* / Q000648:ultrastructure; D014759:Viral Envelope Proteins / Q000378:metabolism; D015678:Viral Structural Proteins / Q000378:metabolism; D019065:Virus Assembly / Q000502:physiology
chemical_list: C446940:A33R protein, Vaccinia virus; C400287:A36R protein, Vaccinia virus; D033962:Adaptor Protein Complex 2; D048868:Adaptor Proteins, Signal Transducing; D002135:Calcium-Binding Proteins; C486206:EPS15 protein, human; D047908:Intracellular Signaling Peptides and Proteins; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D010750:Phosphoproteins; D011993:Recombinant Fusion Proteins; D014168:Transferrin; D014759:Viral Envelope Proteins; D015678:Viral Structural Proteins; C084759:p37 protein, Vaccinia virus; C074512:42kDa protein, Vaccinia virus; D049452:Green Fluorescent Proteins