Stimulation of ribosomal frameshifting by antisense LNA.
Programmed ribosomal frameshifting is a translational recoding mechanism commonly used by RNA viruses to express two or more proteins from a single mRNA at a fixed ratio. An essential element in this process is the presence of an RNA secondary structure, such as a pseudoknot or a hairpin, located downstream of the slippery sequence. Here, we have tested the efficiency of RNA oligonucleotides annealing downstream of the slippery sequence to induce frameshifting in vitro. Maximal frameshifting was observed with oligonucleotides of 12-18 nt. Antisense oligonucleotides bearing locked nucleic acid (LNA) modifications also proved to be efficient frameshift-stimulators in contrast to DNA oligonucleotides. The number, sequence and location of LNA bases in an otherwise DNA oligonucleotide have to be carefully manipulated to obtain optimal levels of frameshifting. Our data favor a model in which RNA stability at the entrance of the ribosomal tunnel is the major determinant of stimulating slippage rather than a specific three-dimensional structure of the stimulating RNA element.
Yu
Chien-Hung
CH
Department of Molecular Genetics, Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands.
Noteborn
Mathieu H M
MH
Olsthoorn
René C L
RC
D018965:Frameshifting, Ribosomal; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D009841:Oligonucleotides / Q000737:chemistry*; D016376:Oligonucleotides, Antisense / Q000737:chemistry*; D013816:Thermodynamics
D009838:Oligodeoxyribonucleotides; D009841:Oligonucleotides; D016376:Oligonucleotides, Antisense; C477371:locked nucleic acid