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. 1997 Feb 1;25(3):545–552. doi: 10.1093/nar/25.3.545

Two step synthesis of (-) strong-stop DNA by avian and murine reverse transcriptases in vitro.

C Isel 1, C Ehresmann 1, G Keith 1, B Ehresmann 1, R Marquet 1
PMCID: PMC146480  PMID: 9016594

Abstract

Retroviral reverses transcriptases (RTs) are RNA- and DNA-dependent DNA polymerases that use a tRNA bound at the so-called primer binding site (PBS) located near the 5'end of the genomic RNA as primer. Thus, RTs must be able to accommodate both RNA and DNA in the primer strand. To test whether the natural primer confers some advantages to the priming process, we compared initiation of reverse transcription of avian and murine retroviral RNAs, using either their natural tRNA primer, tRNATrp and tRNAPro, respectively, or synthetic 18mer oligodeoxyribonucleotides (ODNs) and oligoribonucleotides (ORNs) complementary to their PBS. In both retroviral systems, the initial extension of ODNs was fast and processive. The initial extension of ORNs, tRNATrp and tRNAPro was much slower and distributive, giving rise to the transient accumulation of short pausing products. Synthesis of (-) strong-stop DNA was delayed when using ORNs and tRNAs, compared to ODNs. Even though ORNs and tRNAs were initially extended at the same rate, the short pausing products were more rapidly extended when using the tRNA primers. As a consequence, synthesis of (-) strong-stop DNA was much more efficient with tRNA primers, compared to ORNs. Taken together, these results suggest that the tRNA-primed synthesis of (-) strong-stop DNA is a two-step process, as already observed for HIV-1. The initiation mode corresponds to the initial non-processive nucleotide addition and extension of the short pausing products. It is more efficient with the natural primers than with ORNs. Initiation is followed by a more processive and unspecific elongation mode. Elongation is observed when the primer strand is DNA, i.e. when using the ODNs as primers or when the ORN and tRNA primers have been extended by a sufficient number (depending on the retroviral system) of deoxyribonucleotides.

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Selected References

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