RNA-dependent RNA polymerase (RdRp) in the genus Pelarspovirus of positive-sense single-stranded RNA [(+)ssRNA] viruses, within the Procedovirinae subfamily
This group contains the RdRp of RNA viruses belonging to the Pelarspovirus genus within the subfamily Procedovirinae, family Tombusviridae, order Tolivirales. The genus name "Pelarspovirus" is derived from the pelargonium ringspot virus, which was the first virus to be named. There are 8 species in the Pelarspovirus genus: Clematis chlorotic mottle virus, Elderberry latent virus, Jasmine mosaic-associated virus, Jasmine virus H, Pelargonium chlorotic ring pattern virus, Pelargonium line pattern virus, Pelargonium ringspot virus, and Rosa rugosa leaf distortion virus. Members of the Pelarspovirus have monopartite genomes encoding five open reading frames (ORFs) that include two 5'-proximal replication proteins, two centrally located movement proteins (MP1 and MP2) and a 3'-proximal coat protein that, at least for pelargonium line pattern virus (PLPV), has been shown to act also as suppressor of RNA silencing. 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.
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