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. 1998 Jul 15;26(14):3433–3442. doi: 10.1093/nar/26.14.3433

Pausing of reverse transcriptase on retroviral RNA templates is influenced by secondary structures both 5' and 3' of the catalytic site.

G P Harrison 1, M S Mayo 1, E Hunter 1, A M Lever 1
PMCID: PMC147721  PMID: 9649630

Abstract

In the most extensive examination to date of the relationship between the pausing of reverse transcrip-tase (RT) and RNA secondary structures, pause events were found to be correlated to inverted repeats both ahead of, and behind the catalytic site in vitro. In addition pausing events were strongly associated with polyadenosine sequences and to a lesser degree diadenosines and monoadenosine residues. Pausing was also inversely proportional to the potential bond strength between the nascent strand and the template at the point of termination, for both mono and dinucleotides. A run of five adenosine and four uridine residues caused most pausing on the HIV-1 template, a region which is the site of much sequence heterogeneity in HIV-1. We propose that homopolyadenosine tracts can act as termination signals for RT in the context of inverted repeats as they do for certain RNA polymerases.

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Selected References

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