title: Identification and expression of the outer capsid protein (VP4) of the IDIR strain of group B rotavirus.
abstract: The polypeptide encoded by gene 3 of the IDIR strain of group B rotavirus (GBR) was synthesized by means of a baculovirus expression system. Immunoblot analysis identified the IDIR virus gene 3 product as analogous to the outer capsid protein, VP4, encoded by gene 4 of group A rotaviruses (GAR). This coding assignment had previously been difficult to establish by sequence comparisons, since IDIR virus gene 3 shared < 20% identical amino acid sequences with any GAR protein. Trypsin digestion of the gene 3 protein resulted in the appearance of a product indistinguishable in size from the VP5* outer capsid protein of IDIR agent virions. The recombinant IDIR virus VP4 maintained at least some antigenic epitopes of the native virion protein, as evidenced by reactivity with convalescent antibody obtained following infection of infant rat pups with the IDIR agent. Reactivity was also demonstrated with antisera directed against bovine and porcine isolates of GBR as well as with ADRV, a human strain of GBR.
authors.affiliation: Department of Chemical Engineering, Johns Hopkins University, Baltimore, Maryland 21218.
authors.forename: D A
authors.initials: DA
authors.lastname: Lindsay
authors.forename: S S
authors.initials: SS
authors.lastname: Vonderfecht
authors.forename: R
authors.initials: R
authors.lastname: Willoughby
authors.forename: M J
authors.initials: MJ
authors.lastname: Betenbaugh
authors.forename: J J
authors.initials: JJ
authors.lastname: Eiden
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000914:Antibodies, Viral / Q000276:immunology; D016367:Baculoviridae / Q000235:genetics; D002213:Capsid / Q000096:biosynthesis / Q000187:drug effects / Q000235:genetics*; D036022:Capsid Proteins; D002478:Cells, Cultured; D003429:Cross Reactions; D000939:Epitopes / Q000276:immunology; D005814:Genes, Viral / Q000235:genetics*; D014644:Genetic Variation; D008969:Molecular Sequence Data; D009036:Moths; D011994:Recombinant Proteins / Q000096:biosynthesis; D012401:Rotavirus / Q000235:genetics* / Q000276:immunology; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D014357:Trypsin / Q000494:pharmacology
chemical_list: D000914:Antibodies, Viral; D036022:Capsid Proteins; D000939:Epitopes; D011994:Recombinant Proteins; C060339:VP4 protein, Rotavirus; D014357:Trypsin