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| Content Provider | PubMed Central |
|---|---|
| Author | Huang, S. Ghabrial, S. A. |
| Abstract | The complete nucleotide sequence, 5178 bp, of the totivirus Helminthosporium vicotoriae 190S virus (Hv190SV) double-stranded RNA, was determined. Computer-assisted sequence analysis revealed the presence of two large overlapping ORFs; the 5'-proximal large ORF (ORF1) codes for the coat protein (CP) with a predicted molecular mass of 81 kDa, and the 3'-proximal ORF (ORF2), which is in the -1 frame relative to ORF1, codes for an RNA-dependent RNA polymerase (RDRP). Unlike many other totiviruses, the overlap region between ORF1 and ORF2 lacks known structural information required for translational frameshifting. Using an antiserum to a C-terminal fragment of the RDRP, the product of ORF2 was identified as a minor virion-associated polypeptide of estimated molecular mass of 92 kDa. No CP-RDRP fusion protein with calculated molecular mass of 165 kDa was detected. The predicted start codon of the RDRP ORF (2605-AUG-2607) overlaps with the stop codon (2606-UGA-2608) of the CP ORF, suggesting RDRP is expressed by an internal initiation mechanism. Hv190SV is associated with a debilitating disease of its phytopathogenic fungal host. Knowledge of its genome organization and expression will be valuable for understanding its role in pathogenesis and for potential exploitation in the development of biocontrol measures. |
| Starting Page | 12541 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 22 |
| Volume Number | 93 |
| Language | English |
| Publisher Date | 1996-10-29 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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