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. 1996 Sep 17;93(19):10063–10068. doi: 10.1073/pnas.93.19.10063

Initiation of (-) strand DNA synthesis from tRNA(3Lys) on lentiviral RNAs: implications of specific HIV-1 RNA-tRNA(3Lys) interactions inhibiting primer utilization by retroviral reverse transcriptases.

E J Arts 1, S R Stetor 1, X Li 1, J W Rausch 1, K J Howard 1, B Ehresmann 1, T W North 1, B M Wöhrl 1, R S Goody 1, M A Wainberg 1, S F Grice 1
PMCID: PMC38336  PMID: 8816751

Abstract

Initiation of minus (-) strand DNA synthesis was examined on templates containing R, U5, and primer-binding site regions of the human immunodeficiency virus type 1 (HIV-1), feline immunodeficiency virus (FIV), and equine infectious anemia virus (EIAV) genomic RNA. DNA synthesis was initiated from (i) an oligoribonucleotide complementary to the primer-binding sites, (ii) synthetic tRNA(3Lys), and (iii) natural tRNA(3Lys), by the reverse transcriptases of HIV-1, FIV, EIAV, simian immunodeficiency virus, HIV type 2 (HIV-2), Moloney murine leukemia virus, and avian myeloblastosis virus. All enzymes used an oligonucleotide on wild-type HIV-1 RNA, whereas only a limited number initiated (-) strand DNA synthesis from either tRNA(3Lys). In contrast, all enzymes supported efficient tRNA(3Lys)-primed (-) strand DNA synthesis on the genomes of FIV and EIAV. This may be in part attributable to the observation that the U5-inverted repeat stem-loop of the EIAV and FIV genomes lacks an A-rich loop shown with HIV-1 to interact with the U-rich tRNA anticodon loop. Deletion of this loop in HIV-1 RNA, or disrupting a critical loop-loop complex by tRNA(3Lys) extended by 9 nt, restored synthesis of HIV-1 (-) strand DNA from primer tRNA(3Lys) by all enzymes. Thus, divergent evolution of lentiviruses may have resulted in different mechanisms to use the same host tRNA for initiation of reverse transcription.

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Selected References

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