Summary
The 3′ terminal region of grapevine virus A (GVA) and grapevine virus B (GVB), encompassing 1883 and 2136 nucleotides, respectively, was sequenced by the deoxynucleotide chain termination method. Three putative open reading frames (ORF) were identified in both genomic viral RNAs, denoted 1 to 3 in the 5′ to 3′ direction. ORF 1 encoded a polypeptide with estimated Mr of 31 kDa (GVA) and 36.5 kDa (GVB), possessing the G/D motif of the “30 K superfamily” movement proteins, and showing good alignments with putative movement proteins of trichoviruses and capilloviruses. ORF 2 was identified as the coat protein (CP) cistron, coding for polypeptides with an estimated Mr of 21.5 kDa (GVA) and 21.6 kDa (GVB). These CPs showed substantial sequence homology with one another and with CPs of tricho- and capilloviruses, but not of closteroviruses. ORF 3 potentially coded for two small polypeptides with estimated Mr of 10 kDa (GVA) and 14 kDa (GVB). The ORF 3 product of GVB (14 K), but not that of GVA, shared some homology with the 3′ terminal polypeptides of different plant viruses that exhibit the “zinc finger domain” of proteins with nucleic acid-binding properties. GVA and GVB have many properties in common with trichoviruses but possess an extra open reading frame (ORF 3). Whether this finding may have a bearing on the classification of these viruses is unclear. However, until the taxonomic significance of this difference in genome structure is established, it seems plausible to include GVA and GVB as tentative species in theTrichovirus genus.
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Minafra, A., Saldarelli, P., Grieco, F. et al. Nucleotide sequence of the 3′ terminal region of the RNA of two filamentous grapevine viruses. Archives of Virology 137, 249–261 (1994). https://doi.org/10.1007/BF01309473
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DOI: https://doi.org/10.1007/BF01309473