title: Restoration of potato virus X coat protein capacity for assembly with RNA after His-tag removal.
abstract: We found that the fusion of hexahistidine (H)6 tag to the potato virus X (PVX) coat protein (CP) abolished its ability to be assembled with viral RNA into helical nucleoprotein virus-like particles (VLPs). Instead, irregular agglomerates were produced upon incubation of PVX RNA with (H)6-tagged PVX CP. A factor Xa recognition site, IEGR, was inserted upstream of the CP coding sequence. Removal of the (H)6 tag from PVX CP by Xa protease restored its ability to bind RNA and to assemble VLPs. In addition to the canonical IEGR site, the factor Xa protease was found to cleave PVX CP at a second (non-consensus) site, AVTRGR, located close to the C-terminus of PVX CP. The latter cleavage did not affect reassembly of the PVX RNA and CP into VLPs.
authors.affiliation: Department of Virology, Moscow State University, 119991 Moscow, Russia.
authors.forename: Olga
authors.initials: O
authors.lastname: Zayakina
authors.forename: Marina
authors.initials: M
authors.lastname: Arkhipenko
authors.forename: Alexander
authors.initials: A
authors.lastname: Smirnov
authors.forename: Nina
authors.initials: N
authors.lastname: Rodionova
authors.forename: Olga
authors.initials: O
authors.lastname: Karpova
authors.forename: Joseph
authors.initials: J
authors.lastname: Atabekov
mesh_terms: D001665:Binding Sites; D036022:Capsid Proteins / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification*; D013286:Datura stramonium / Q000821:virology; D015951:Factor Xa / Q000737:chemistry; D006639:Histidine / Q000737:chemistry; D009842:Oligopeptides / Q000737:chemistry; D010447:Peptide Hydrolases / Q000737:chemistry / Q000378:metabolism; D017863:Potexvirus; D015202:Protein Engineering; D012367:RNA, Viral / Q000378:metabolism*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000302:isolation & purification; D019065:Virus Assembly
chemical_list: D036022:Capsid Proteins; C471213:His-His-His-His-His-His; D009842:Oligopeptides; D012367:RNA, Viral; D011994:Recombinant Proteins; C058750:coat protein, Potato virus X; D006639:Histidine; D010447:Peptide Hydrolases; D015951:Factor Xa