Selection of Retroviral Reverse Transcription Primer is Coordinated with TRNA Biogenesis

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 2003 Jul 30

PMID 12885888

Citations 14

Authors

Nathan J Kelly

Matthew T Palmer

Casey D Morrow

Affiliations

Soon will be listed here.

Abstract

Initiation of retrovirus reverse transcription requires the selection of a tRNA primer from the intracellular milieu. To investigate the features of primer selection, a human immunodeficiency virus type 1 (HIV-1) and a murine leukemia virus (MuLV) were created that require yeast tRNA(Phe) to be supplied in trans for infectivity. Wild-type yeast tRNA(Phe) expressed in mammalian cells was transported to the cytoplasm and aminoacylated. In contrast, tRNA(Phe) without the D loop (tRNA(Phe)D(-)) was retained within the nucleus and did not complement infectivity of either HIV-1 or MuLV; however, infectivity was restored when tRNA(Phe)D(-) was directly transfected into the cytoplasm of cells. A tRNA(Phe) mutant (tRNA(Phe)UUA) that did not have the capacity to be aminoacylated was transported to the cytoplasm and did complement infectivity of both HIV-1 and MuLV, albeit at a level less than that with wild-type tRNA(Phe). Collectively, our results demonstrate that the tRNA primer captured by HIV-1 and MuLV occurs after nuclear export of tRNA and supports a model in which primer selection for retroviruses is coordinated with tRNA biogenesis at the intracellular site of protein synthesis.

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