Nucleic Acids Research, 2002, Vol. 30, No. 23 5094-5102
© 2002 Oxford University Press
Characterization of the frameshift stimulatory signal controlling a programmed 1 ribosomal frameshift in the human immunodeficiency virus type 1
Département de Biochimie, Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montréal, Québec H3T 1J4, Canada
*To whom correspondence should be addressd. Tel: +1 514 343 6316; Fax: +1 514 343 2210; Email: gingras{at}bcm.umontreal.ca
Synthesis of the Gag-Pol protein of the human immunodeficiency virus type 1 (HIV-1) requires a programmed 1 ribosomal frameshifting when ribosomes translate the unspliced viral messenger RNA. This frameshift occurs at a slippery sequence followed by an RNA structure motif that stimulates frameshifting. This motif is commonly assumed to be a simple stemloop for HIV-1. In this study, we show that the frameshift stimulatory signal is more complex than believed and consists of a two-stem helix. The upper stemloop corresponds to the classic stemloop, and the lower stem is formed by pairing the spacer region following the slippery sequence and preceding this classic stemloop with a segment downstream of this stemloop. A three-purine bulge interrupts the two stems. This structure was suggested by enzymatic probing with nuclease V1 of an RNA fragment corresponding to the gag/pol frameshift region of HIV-1. The involvement of the novel lower stem in frameshifting was supported by site-directed mutagenesis. A fragment encompassing the gag/pol frameshift region of HIV-1 was inserted in the beginning of the coding sequence of a reporter gene coding for the firefly luciferase, such that expression of luciferase requires a 1 frameshift. When the reporter was expressed in COS cells, mutations that disrupt the capacity to form the lower stem reduced frameshifting, whereas compensatory changes that allow re-formation of this stem restored the frameshift efficiency near wild-type level. The two-stem structure that we propose for the frameshift stimulatory signal of HIV-1 differs from the RNA triple helix structure recently proposed.
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