Dual Role for Motif 1 Residues of Human Lysyl-tRNA Synthetase in Dimerization and Packaging into HIV-1

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2012 Oct 26

PMID 23095741

Citations 14

Authors

Varun Dewan

Min Wei

Lawrence Kleiman

Karin Musier-Forsyth

Affiliations

Soon will be listed here.

Abstract

The primer for reverse transcription in human immunodeficiency virus type 1, human tRNA(Lys,3), is selectively packaged into the virion along with tRNA(Lys1,2). Human lysyl-tRNA synthetase (hLysRS), the only cellular factor known to interact specifically with all three tRNA(Lys) isoacceptors, is also selectively packaged into HIV-1. We have previously defined a tRNA(Lys) packaging complex that includes the tRNA(Lys) isoacceptors, LysRS, HIV-1 Gag, GagPol, and viral RNA. Numerous studies support the hypothesis that during tRNA(Lys) packaging, a Gag·GagPol complex interacts with a tRNA(Lys)·LysRS complex, with Gag interacting specifically with the catalytic domain of LysRS, and GagPol interacting with both Gag and tRNA(Lys). In this work, we have identified residues along one face of the motif 1 dimerization helix (H7) of hLysRS that are critical for packaging of the synthetase into virions. Mutation of these residues affects binding to Gag in vitro, as well as the oligomerization state and aminoacylation activity of the synthetase. Taken together, these data suggest that H7 of LysRS has a dual function. In its canonical role it maintains the synthetase dimer interface, whereas in its function in tRNA primer recruitment, it bridges interactions with HIV-1 Gag.

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