catalytic core domain of RNA-dependent RNA polymerase (RdRp) in the family Benyviridae of positive-sense single-stranded RNA [(+)ssRNA] viruses
This group contains the catalytic core domain of RdRp of RNA viruses belonging to the family Benyviridae, order Hepelivirales. The Benyviridae is a family of plant viruses with rod-shaped virions. Their genomes are multipartite (+)ssRNAs with 5' m7G-cap and 3' poly(A) and there is post-translational cleavage of the viral replicase. Beet necrotic yellow vein virus belongs to the genus Benyvirus and is the cause of 'rhizomania' disease of sugar beet. This widespread soil-borne disease can severely reduce sugar beet growth and beet sucrose production. BNYVV RNA1 contains one open reading frame (ORF) encoding a replicase protein that harbors motifs for methyltransferase, helicase, papain-like protease, and RdRp. The RdRp domain displays a right hand with three functional subdomains, called fingers, palm, and thumb. All RdRps contain conserved polymerase motifs (A-G), located in the palm (A-E motifs) and finger (F-G) subdomains. All these motifs have been implicated in RdRp fidelity such as processes of correct incorporation and reorganization of nucleotides.
Jiyao W et al.(2023). "The conserved domain database in 2023.",