Abstract
The complete sequences of three double-stranded (ds) RNAs (referred to F1, F2 and F3) of Penicillium stoloniferum virus F (PsV-F) were established. The F1 dsRNA was 1677 bp in length, and it contained one open reading frame (ORF) of 538 amino acids (molecular weight of 63 kDa, referred to P63), The F2 dsRNA was 1500 by in length, and also it contained one ORF of 420 amino acids (molecular weight of 46 kDa, referred to P46). The F3 dsRNA was 677 bp in length, but contained a small ORF with unknown function. A sequence motif of (5′-CGTAAAA-3′) was found only at the 5′ termini of the F1 and F2 dsRNAs, and a sequence motif of (5′-TAAAAAAAAA-3′) was found at the 3′ termini of all three dsRNA segments. The predicted amino acid sequence of F1 showed 38–48% sequence homology with the putative dsRNA-dependent RNA polymerases (RdRp) of dsRNA viruses, but the predicted amino acid of F2 showed no homology. Phylogenetic analysis using the RdRp sequences of the various Partitiviruses and Alphacryptoviruses revealed that PsV-F clustered well with Partitiviruses, but showed remote relationship with PsV-S. Near full-length and positive-sense single-stranded (ss) RNAs derived from the Fl, F2 and F3 dsRNAs were detected from the PsV-infected host cell. The expressed proteins of P63 and P46 showed a positive reaction against PsV-F antiserum, indicating P63 and P46 as RdRp and capsid protein, respectively. These results suggest that PsV-F can be a member of Partitivirus, but it is quite distinct from PsV-S electrophoretically, serologically and genetically, though both viruses coexist in the same cell.
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Kim, J.W., Choi, E.Y. & Lee, J.I. Genome Organization and Expression of the Penicillium stoloniferum Virus F. Virus Genes 31, 175–183 (2005). https://doi.org/10.1007/s11262-005-1793-y
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DOI: https://doi.org/10.1007/s11262-005-1793-y