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. 1995 May 11;23(9):1487–1494. doi: 10.1093/nar/23.9.1487

Prokaryotic ribosomes recode the HIV-1 gag-pol-1 frameshift sequence by an E/P site post-translocation simultaneous slippage mechanism.

J A Horsfield 1, D N Wilson 1, S A Mannering 1, F M Adamski 1, W P Tate 1
PMCID: PMC306887  PMID: 7784201

Abstract

The mechanism favoured for -1 frameshifting at typical retroviral sites is a pre-translocation simultaneous slippage model. An alternative post-translocation mechanism would also generate the same protein sequence across the frameshift site and therefore in this study the strategic placement of a stop codon has been used to distinguish between the two mechanisms. A 26 base pair frameshift sequence from the HIV-1 gag-pol overlap has been modified to include a stop codon immediately 3' to the heptanucleotide frameshift signal, where it often occurs naturally in retroviral recoding sites. Stop codons at the 3'-end of the heptanucleotide sequence decreased the frame-shifting efficiency on prokaryote ribosomes and the recording event was further depressed when the levels of the release factors in vivo were increased. In the presence of elevated levels of a defective release factor 2, frameshifting efficiency in vivo was increased in the constructs containing the stop codons recognized specifically by that release factor. These results are consistent with the last six nucleotides of the heptanucleotide slippery sequence occupying the ribosomal E and P sites, rather than the P and A sites, with the next codon occupying the A site and therefore with a post-translocation rather than a pre-translocation -1 slippage model.

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