1. The 5' non-translated region of Varroa destructor virus 1 (genus Iflavirus): structure prediction and IRES activity in Lymantria dispar cells
- Author
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Juliette R. Ongus, Els C. Roode, Monique M. van Oers, Cornelis W. A. Pleij, and Just M. Vlak
- Subjects
Insecta ,Genes, Viral ,Molecular Sequence Data ,Laboratory of Virology ,picorna-like-virus ,Picornaviridae ,Spodoptera ,Regulatory Sequences, Nucleic Acid ,Transfection ,cricket-paralysis-virus ,hepatitis-c virus ,internal ribosome entry ,translation initiation ,Laboratorium voor Virologie ,Species Specificity ,Genes, Reporter ,Luciferases, Firefly ,Virology ,Lymantria dispar ,Animals ,Luciferase ,RNA, Messenger ,Cricket paralysis virus ,Cells, Cultured ,Rhopalosiphum padi virus ,Reporter gene ,Base Composition ,biology ,Base Sequence ,Schneider 2 cells ,nucleotide-sequence analysis ,fungi ,triatoma-virus ,biology.organism_classification ,Blotting, Northern ,PE&RC ,Internal ribosome entry site ,Gene Expression Regulation ,Nucleic Acid Conformation ,RNA, Viral ,insect ,5' Untranslated Regions ,rhopalosiphum-padi virus ,Ribosomes ,Algorithms ,rna viruses - Abstract
Structure prediction of the 5′ non-translated region (NTR) of four iflavirus RNAs revealed two types of potential internal ribosome entry site (IRES), which are discriminated by size and level of complexity, in this group of viruses. In contrast to the intergenic IRES of dicistroviruses, the potential 5′ IRES structures of iflaviruses do not have pseudoknots. To test the activity of one of these, a bicistronic construct was made in which the 5′ NTR ofVarroa destructorvirus 1 (VDV-1) containing a putative IRES was cloned in between two reporter genes, enhanced green fluorescent protein and firefly luciferase (Fluc). The presence of the 5′ NTR of VDV-1 greatly enhanced the expression levels of the second reporter gene (Fluc) inLymantria disparLd652Y cells. The 5′ NTR was active in a host-specific manner, as it showed lower activity inSpodoptera frugiperdaSf21 cells and no activity inDrosophila melanogasterS2 cells.
- Published
- 2006
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