Zakharova OD, Tarrago-Litvak L, Fournier M, Andreola ML, Repkova MN, Venyaminova AG, Litvak S, Nevinsky GA. Interaction of primer tRNA(Lys3) with the p51 subunit of human immunodeficiency virus type 1 reverse transcriptase: a possible role in enzyme activation.
FEBS Lett 1995;
361:287-90. [PMID:
7535248 DOI:
10.1016/0014-5793(95)00200-s]
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Abstract
In the interaction between HIV-1 RT and tRNA(Lys3) each subunit of the heterodimer interacts with tRNA showing a different affinity: Kd (p66) = 23 nM, Kd (p51) = 140 nM. Preincubation of heterodimeric RT with tRNA, at concentrations similar to that of the Kd value for p51, leads to an increase of the catalytic activity on poly(A)-oligo(dT). These results were compared to those using different tRNA analogs: oxidized tRNA, tRNAs lacking one, two or three nucleotides from the 3'-end, or ribo- and deoxyribonucleotides mimicking the anticodon loop sequence. In all cases, tRNA analogs were weaker activators of HIV-1 RT than natural tRNA. A possible mechanism of RT p66/p51 activation by tRNA and its analogs, mediated through the p51 subunit, is discussed.
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