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Journal of Virology, May 2004, p. 4907-4913, Vol. 78, No. 9
0022-538X/04/$08.00+0 DOI: 10.1128/JVI.78.9.4907-4913.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
Department of Human Retrovirology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
Received 10 October 2003/ Accepted 3 December 2003
We investigated the in vitro RNA dimerization properties of the untranslated leader RNA derived from human immunodeficiency virus type 1 variants circulating in an individual with a low viral load and slow disease progression. The leader sequences of these viruses contain highly unusual polymorphisms within the dimerization initiation site (DIS): an insert that abolishes dimerization and a compensatory substitution. The dimerization of leader RNA from late stages of infection is further improved by additional mutations outside the DIS motif that facilitate a secondary structure switch from a dimerization-incompetent to a dimerization-competent RNA conformation.
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