Author: Yu, Chien-Hung; Noteborn, Mathieu H.; Pleij, Cornelis W. A.; Olsthoorn, René C. L.
Title: Stem–loop structures can effectively substitute for an RNA pseudoknot in -1 ribosomal frameshifting Document date: 2011_7_29
ID: wifs97yy_2
Snippet: The signals that are responsible for À1 frameshifting comprise two elements: a slippery sequence where the actual reading shift takes place, and a downstream located structural element which greatly stimulates the efficiency of frameshifting. Although the mechanism is still elusive, the present view is that the downstream structure forms a physical barrier that blocks EF-2 function and causes ribosomes to stall in their translocation step. This .....
Document: The signals that are responsible for À1 frameshifting comprise two elements: a slippery sequence where the actual reading shift takes place, and a downstream located structural element which greatly stimulates the efficiency of frameshifting. Although the mechanism is still elusive, the present view is that the downstream structure forms a physical barrier that blocks EF-2 function and causes ribosomes to stall in their translocation step. This 'roadblock' puts tension on the mRNA-tRNA interaction. The tension can be relieved by the realigning of A-site and P-site tRNAs in the 5 0 -direction, whereafter EF-2 can do its work and the ribosome resumes translation in the À1 reading frame (3) .
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