title: A novel virus of the late blight pathogen, Phytophthora infestans, with two RNA segments and a supergroup 1 RNA-dependent RNA polymerase.
abstract: Double-stranded RNA representing four distinct electrophoretic patterns was found in a screen of Phytophthora infestans isolates. Two dsRNAs that always appeared together were sequenced. RNA 1, which was 3160 nt plus a poly (A) tail, contained a single deduced ORF with the potential to encode a polyprotein of 977 aa with motifs characteristic of supergroup I viral RdRps. The 2776 nt, polyadenylated RNA2 contained an ORF with a potential to encode a polyprotein of 847 aa including a possible trypsin-like serine protease, and a second putative ORF of unknown function. An alternative form of RNA2, in which a 19-nt stretch was replaced by a 9-nt sequence, was detected in 4 of 17 clones sequenced. Based on genome structure and phylogenetic analysis, this virus did not fit into any known virus family and we tentatively named it Phytophthora infestans RNA virus 1 (PiRV-1).
authors.affiliation: Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Ithaca, NY 14853, USA. cai@aesop.rutgers.edu
authors.forename: Guohong
authors.initials: G
authors.lastname: Cai
authors.forename: Kevin
authors.initials: K
authors.lastname: Myers
authors.forename: Bradley I
authors.initials: BI
authors.lastname: Hillman
authors.forename: William E
authors.initials: WE
authors.lastname: Fry
mesh_terms: D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D000595:Amino Acid Sequence; D001483:Base Sequence; D016679:Genome, Viral; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010802:Phylogeny; D055750:Phytophthora infestans / Q000472:pathogenicity* / Q000821:virology*; D012328:RNA Viruses / Q000145:classification / Q000201:enzymology / Q000235:genetics* / Q000302:isolation & purification*; D012367:RNA, Viral / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D012324:RNA-Dependent RNA Polymerase / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D012697:Serine Endopeptidases / Q000235:genetics
chemical_list: D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D012367:RNA, Viral; D012324:RNA-Dependent RNA Polymerase; D012697:Serine Endopeptidases