title: Picornaviruses.
abstract: The picornavirus family consists of a large number of small RNA viruses, many of which are significant pathogens of humans and livestock. They are amongst the simplest of vertebrate viruses comprising a single stranded positive sense RNA genome within a T = 1 (quasi T = 3) icosahedral protein capsid of approximately 30 nm diameter. The structures of a number of picornaviruses have been determined at close to atomic resolution by X-ray crystallography. The structures of cell entry intermediate particles and complexes of virus particles with receptor molecules or antibodies have also been obtained by X-ray crystallography or at a lower resolution by cryo-electron microscopy. Many of the receptors used by different picornaviruses have been identified, and it is becoming increasingly apparent that many use co-receptors and alternative receptors to bind to and infect cells. However, the mechanisms by which these viruses release their genomes and transport them across a cellular membrane to gain access to the cytoplasm are still poorly understood. Indeed, detailed studies of cell entry mechanisms have been made only on a few members of the family, and it is yet to be established how broadly the results of these are applicable across the full spectrum of picornaviruses. Working models of the cell entry process are being developed for the best studied picornaviruses, the enteroviruses. These viruses maintain particle integrity throughout the infection process and function as genome delivery modules. However, there is currently no model to explain how viruses such as cardio- and aphthoviruses that appear to simply dissociate into subunits during uncoating deliver their genomes into the cytoplasm.
authors.affiliation: Faculty of Biological Sciences, Institute for Molecular and Cellular Biology, Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, West Yorkshire, LS2 9JT, UK. toby.tuthill@bbsrc.ac.uk
authors.forename: Tobias J
authors.initials: TJ
authors.lastname: Tuthill
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Groppelli
authors.forename: James M
authors.initials: JM
authors.lastname: Hogle
authors.forename: David J
authors.initials: DJ
authors.lastname: Rowlands
mesh_terms: D000818:Animals; D051242:Caveolin 1 / Q000502:physiology; D002966:Clathrin / Q000502:physiology; D004705:Endocytosis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D010849:Picornaviridae / Q000502:physiology* / Q000648:ultrastructure; D011991:Receptors, Virus / Q000502:physiology; D014771:Virion / Q000648:ultrastructure; D053586:Virus Internalization
chemical_list: D051242:Caveolin 1; D002966:Clathrin; D011991:Receptors, Virus
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