title: Guanosine 5'-O-(3-thiotriphosphate) inhibits capping of reovirus mRNA.
abstract: RNA synthesized by reovirus cores was not capped or methylated when GTP was replaced by guanosine 5'-O-(3-thiotriphosphate) [gamma-S]GTP as a reaction substrate. Full length transcripts were synthesized in the presence of [gamma-S]GTP which indicated that capping could be dissociated from the process of transcription. Exogenous [gamma-S]GTP was not cleaved by the virion-associated phosphohydrolase and the majority of transcripts contained triphosphorylated 5'-termini. [gamma-S]GTP did, however, act as a donor for the capping of RNA chains initiated with GTP. Chromatography on mercury-agarose of products initiated with [gamma-S]GTP resulted in the binding of only the small (14 S) size class of RNA, although transcripts not bound to the affinity column were also thiophosphorylated.
mesh_terms: D016244:Guanosine 5'-O-(3-Thiotriphosphate); D006160:Guanosine Triphosphate / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D007700:Kinetics; D012089:Mammalian orthoreovirus 3 / Q000187:drug effects / Q000378:metabolism*; D012315:RNA Caps / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism*; D012367:RNA, Viral / Q000378:metabolism*; D012087:Reoviridae / Q000378:metabolism*; D013873:Thionucleotides / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D012315:RNA Caps; D012333:RNA, Messenger; D012367:RNA, Viral; D013873:Thionucleotides; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D006160:Guanosine Triphosphate