Abstract
The retroviral genome consists of two identical RNA molecules physically linked together close to their 5′ end, in a region called the Dimer Linkage Structure (DLS). Recent findings suggest that dimerization is involved in encapsidation, regulation of translation and reverse transcription. Previous in vitro studies localized the DLS of HIV-1 in a region downstream of the splice donor (SD) site. More recently, we showed that dimerization of HIV-1 RNA also involves sequences upstream of the SD site. Modification interference experiments and site-directed mutagenesis were used to identify the nucleotides required in the dimerization process of HIV-1 RNA. Our results point out a self-complementary sequence located in a hairpin loop, between the Primer Binding Site (PBS) and the SD site, as the Dimerization Initiation Site.
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