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. 1994 Aug 30;91(18):8705–8709. doi: 10.1073/pnas.91.18.8705

Characterization of a "kissing" hairpin complex derived from the human immunodeficiency virus genome.

K Y Chang 1, I Tinoco Jr 1
PMCID: PMC44675  PMID: 8078946

Abstract

Base-pair formation between two hairpin loops--a "kissing" complex--is an RNA-folding motif that links two elements of RNA secondary structure. It is also a unique protein recognition site involved in regulation of ColE1 plasmid DNA replication. The trans-activation response element (TAR), a hairpin and bulge at the 5' end of the untranslated leader region of the human immunodeficiency virus 1 mRNA, enhances the transcription of the virus and is necessary for viral replication. Gel electrophoresis and absorbance melting curves indicate that a synthesized RNA hairpin (Tar*-16) with a loop sequence complementary to the TAR loop sequence (CUGGGA) associates specifically with a 16-nucleotide TAR hairpin (Tar-16) to form a stable complex. RNase T1 probing indicates that the three guanines in the Tar-16 loop become inaccessible in the complex. NMR imino proton spectra reveal that 5 base pairs are formed between the two hairpin loops (Tar-16 and Tar*-16); only the adenine at the 3' terminus of the TAR loop does not form a base pair with the 5'-terminal uracil of the complementary loop. A 14-nucleotide hairpin [CCUA(UCCCAG)UAGG] with a loop sequence complementary to the TAR loop is conserved within the gag gene of human immunodeficiency virus 1. A synthesized RNA hairpin corresponding to this conserved sequence also binds to the Tar-16 hairpin with high affinity. It is possible that the same RNA loop-loop interaction occurs during the viral life cycle.

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Selected References

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