Luteovirusslides.1perpage

Luteovirusslides.1perpage - Supergroups Virus Lineages...

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Supergroups Virus Lineages Properties? Viruses?
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Supergroup I Picorna-like (potyvirus-like) 5’-VPg, 3’-polyadenylate RNA synthesis primed by VPg-pN One polyprotein per genomic RNA No subgenomic mRNA Protein synthesis IRES initiated 1 or 2 genomic RNAs Supergroup III Sindbis/Alphavirus -like (TMV-like) 5’-cap, typically 3’- tRNA-like structure but some genera have 3’- polyadenylate Subgenomic RNA(s) synthesized by internal initiation on (-)RNA 1, 2 or 3 genomic RNAs Some comparisons of Supergroup I and Supergroup III plant viruses
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Figure legends Sequence comparisons indicate that the RNA viruses have arisen by modular evolution. 3 RdRp Evolutionary Modules or Sources Levi-like Alpha or Sindbis -like Polio-like
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Supergroup II plant viruses No characteristic 3’ structure of the genomic RNA, no polyadenylate 5’ structure none, or VPg, or not characterized Virion capsid symmetry isometric No characteristic GXXGXGKS helicase motif No methyl transferase motif
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General properties of luteoviruses (family Luteoviridae ) Phloem limited within host plants Non-mechanically transmissible to plants, transmitted specifically by aphid vectors in a circulative, non- propagative manner Vector specificity is high, aphids must feed to acquire and/or transmit the virus Yellowing symptoms on plants Cause a number of very important plant diseases worldwide + sense ssRNA genomes, no 5’ cap, no characteristic 3’ structure.
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There are currently 18 families ( dae ) of plant viruses; plus 81 genera ( virus ; not including viroids and other subviral agents). Not all genera are within assigned families at this time, and some new genera and families are not shown at right. According to Hull, (page 87) he says there are 977 species of plant viruses as of 2002, more are being identified all the time. Within the genus Potyvirus , there are more than 100 definitive and tentative species. •No true dsDNA viruses •Retro types contain dsDNA 75% are ssRNA •Few minus & ambisense ssRNA genomes
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Typical symptoms on plants caused by viruses of the family Luteoviridae . The yellow plague. Barley yellow dwarf virus was discovered at UC Davis in 1951
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Luteoviridae has 3 genera: Polerovirus , Luteovirus and Enamovirus ORF 0 product We predict that one ORF, ORF 0 will be translated from this genomic RNA. It is, but that is not all.
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Luteoviridae has 3 genera: Polerovirus , Luteovirus and Enamovirus How are these genes expressed?
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Luteovirusslides.1perpage - Supergroups Virus Lineages...

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