Effects of tRNA₃^Lys aminoacylation on the initiation of HIV-1 reverse transcription

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• 作者：Rigourd ; Mickaë ; l ; Bec ; Guillaume ; Bé ; nas ; Philippe ; Le Grice ; Stuart F.J. ; Ehresmann ; Bernard ; et. al.
• 关键词：tRNA ; Primer ; Polymerase ; Retrovirus ; AIDS
• 刊名：Biochimie
• 出版年：2003
• 出版时间：May, 2003
• 年：2003
• 卷：85
• 期：5
• 页码：521-525
• 全文大小：154 K

文摘

HIV-1 utilizes cellular tRNA₃^Lys to prime the initiation of reverse transcription. The selective incorporation of cytoplasmic tRNA₃^Lys into HIV-1 particles was recently shown to involve the lysyl-tRNA synthetase, and hence, the encapsidated tRNA₃^Lys is likely to be aminoacylated. Here, we tested the effect of aminoacylation on the initiation of reverse transcription. We show that HIV-1 reverse transcriptase is unable to extend lysyl-tRNA₃^Lys. In addition, the viral polymerase does not significantly enhance the rate of tRNA deacylation, in contrast with previous studies on avian retroviruses. Thus, aminoacylation of the primer tRNA might prevent the initiation of HIV-1 reverse transcription from taking place before viral budding and maturation.