Abstract:
:The P150 and P90 replicase proteins of rubella virus (RUBV), a plus-strand RNA Togavirus, produce a unique cytoplasmic fiber network resembling microtubules. Pharmacological and mutagenic approaches were used to determine if these fibers functioned in virus replication. The pharmacological approach revealed that microtubules were required for fiber formation, but neither was necessary for virus replication. Through the mutagenic approach it was found that α-helices near both termini of P150 were necessary for fiber assembly and infectivity, but fiber formation and viability could not be correlated because most of these mutations were lethal. The N-terminal α-helix of P150 affected both proteolytic processing of P150 and P90 from the P200 precursor and targeting of P200, possibly through directing conformational folding of P200. Finally, we made the unexpected discovery that RUBV genomes can spread from cell-to-cell without virus particles, a process that we hypothesize utilizes RUBV-induced cytoplasmic projections containing fibers and replication complexes.
journal_name
Virologyjournal_title
Virologyauthors
Matthews JD,Tzeng WP,Frey TKdoi
10.1016/j.virol.2010.07.025subject
Has Abstractpub_date
2010-10-25 00:00:00pages
212-27issue
2eissn
0042-6822issn
1096-0341pii
S0042-6822(10)00478-2journal_volume
406pub_type
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