title: Birnavirus precursor polyprotein is processed in Escherichia coli by its own virus-encoded polypeptide.
abstract: The cDNA fragment of the large RNA segment of infectious bursal disease virus 002-73, when expressed in Escherichia coli, produces precursor polyprotein (N-VP2-VP4-VP3-C), most of which is then processed to generate constituent polypeptides. Using cDNA fragments containing site-specific mutations and two monoclonal antibodies that are specific to VP2 and VP3 of mature virus particles, we demonstrated that the VP4 protein is involved in processing of the precursor polyprotein to generate VP2 and VP3 and excluded the possibility of internal initiation for the generation of VP3.
authors.affiliation: CSIRO, Division of Protein Chemistry, Parkville, Australia.
authors.forename: M N
authors.initials: MN
authors.lastname: Jagadish
authors.forename: V J
authors.initials: VJ
authors.lastname: Staton
authors.forename: P J
authors.initials: PJ
authors.lastname: Hudson
authors.forename: A A
authors.initials: AA
authors.lastname: Azad
mesh_terms: D004247:DNA / Q000235:genetics; D004926:Escherichia coli / Q000378:metabolism; D007243:Infectious bursal disease virus / Q000378:metabolism*; D011498:Protein Precursors / Q000378:metabolism*; D011499:Protein Processing, Post-Translational; D011994:Recombinant Proteins / Q000378:metabolism*; D012087:Reoviridae / Q000378:metabolism*; D014764:Viral Proteins / Q000378:metabolism*
chemical_list: D011498:Protein Precursors; D011994:Recombinant Proteins; D014764:Viral Proteins; D004247:DNA