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Journal of Virology logoLink to Journal of Virology
. 1997 Apr;71(4):3250–3254. doi: 10.1128/jvi.71.4.3250-3254.1997

Human immunodeficiency virus type 1 RNA outside the primary encapsidation and dimer linkage region affects RNA dimer stability in vivo.

J I Sakuragi 1, A T Panganiban 1
PMCID: PMC191458  PMID: 9060689

Abstract

To characterize the cis-acting determinants that function in RNA dimer formation and maintenance, we examined the stability of RNA dimers isolated from virus particles containing mutations in the encapsidation region of human immunodeficiency virus type 1 (HIV-1). The genomic RNAs of all mutants containing lesions in elements required for in vitro dimerization exhibited thermal stability similar to that of wild-type (WT) HIV-1. These data indicate that the eventual formation of stable dimeric RNA in vivo is not absolutely dependent on the elements that promote dimer formation in vitro. Surprisingly, mutants that lacked a large segment of the middle portion of the genome, outside the likely primary dimer linkage region, formed RNA dimers that were measurably more stable than WT. In addition, the insertion of one or multiple copies of a foreign gene, which resulted in a series of vectors that approached RNA length similar to that of WT RNA, still exhibited augmented dimer stability. These results suggest that there are regions in the HIV-1 genome outside the primary dimer initiation and dimer linkage regions that can negatively affect dimer stability.

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Selected References

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