Journal
VIROLOGY
Volume 364, Issue 1, Pages 169-177Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2007.02.010
Keywords
HIV; tRNA; primer binding site; reverse transcription
Categories
Funding
- NIAID NIH HHS [AI34749, R37 AI034749-10, AI 27767, R37 AI034749, AI07493, R37 AI034749-09, T32 AI007493-12, T32 AI007493-08, T32 AI007493-10, R37 AI034749-13, T32 AI007493-09, R37 AI034749-11, R37 AI034749-12, T32 AI007493-11, P30 AI027767, T32 AI007493] Funding Source: Medline
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HIV-1 utilizes tRNA(Lys,3) as the primer for initiation of reverse transcription. To further examine the tRNA sequence and structural requirements for primer selection, we developed a complementation system which required tRNA(Lys,3) to be provided in trans. We constructed an Lys,3 HIV-1 provirus in which the primer-binding site (PBS) was altered to be complementary to the 3' terminal 18-nucleotides of E. Coli tRNA(Lys,3) which shares many bases with mammalian tRNA(Lys,3), and demonstrated that infectious virus was obtained only if the provirus was co-transfected with the plasmid encoding E. coli tRNA(Lys,3). In the current study we have mutated E. coli tRNA(Lys,3) so that nucleotides within the stem of the anticodon stein-loop were made identical to mammalian tRNA(Lys,3). Analysis of the complementation revealed that the modified E. coli tRNA(Lys,3) (E. coli tRNA(Lys,3)-MA) complemented 3-5 times more efficiently than E. coli tRNA(Lys,3). Mutation of nucleotides within the anticodon stem region of E. coli tRNA(Lys,3)-MA that differed from E. coli tRNA(Lys,3) revealed the importance of the nucleotide sequence for efficient use in reverse transcription. The results of our studies highlight that multiple regions of mammalian tRNA(Lys,3) are important for the preference of tRNA(Lys,3) as the primer for HIV-1 reverse transcription. (C) 2007 Elsevier Inc. All rights reserved.
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