Notes on Family: Tymoviridae

icosahedra

Contents

• Members of this Family
• General Description
• Morphology
• Genome
• Genera in the Family
• All Known Sequences
• Curated Sequences

General Description

This family is characterised icosahedral virions about 30 nm in diameter and a single component of single-stranded C-rich RNA. The RNA encodes a large replication protein and a coat protein translated from a 3'-coterminal subgenomic RNA. There are additional ORFs in some genera.

Morphology

Virions isometric and icosahedral (T=3), not enveloped, about 30 nm in diameter.

Genomen

Monopartite positive sense single-stranded RNA of about 6-7.5 kb. The RNA encodes a large replication protein and a coat protein translated from a 3'-coterminal subgenomic RNA. The 3'-terminus may have a tRNA-like structure or a polyA tract, depending upon the virus.

Genera in the Family

• Maculavirus: genome >7kb; phloem-limited; no known vectors
• Marafivirus: genome 6-7kb; two coat proteins; transmitted by leafhoppers
• Tymovirus: genome 6-7kb; single coat protein; transmitted by sap and by beetles