Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6140112 | Virology | 2014 | 10 Pages |
â¢Proximity to the 5â² end of the kissing-loop interaction can negatively impact translation of SCV.â¢Phylogenetically conserved 5â² terminal hairpin in carmoviruses is involved in translation.â¢Natural upstream out-of-frame AUG in SCV genomic RNA significantly reduces translation of a reporter mRNA.
The Panicum mosaic virus-like translation enhancer (PTE) functions as a cap-independent translation enhancer (3â²CITE) in members of several Tombusviridae genera including 7/19 carmoviruses. For nearly all PTE, a kissing-loop connects the element with a hairpin found in several conserved locations in the genomic RNA (5â² terminal hairpin or ~100Â nt from the 5â² end) and small subgenomic RNA (~63Â nt from the 5â² end). Moving the interaction closer to the 5â² end in reporter mRNAs using Saguaro cactus virus (SCV) sequences had either a minimal or substantial negative effect on translation. Movement of the kissing loop from position 104 to the SCV 5â² terminal hairpin also reduced translation by 4-fold. These results suggest that relocating the PTE kissing loop closer to the 5â² end reduces PTE efficiency, in contrast to results for the Barley yellow dwarf BTE and Tomato bushy stunt virus Y-shaped 3â²CITEs, suggesting that different 3â²CITEs have different bridging requirements.