Interactions between Ty1 Retrotransposon RNA and the T and D Regions of the tRNA i Met Primer Are Required for Initiation of Reverse Transcription In Vivo

Author:

Friant S.1,Heyman T.2,Byström A. S.3,Wilhelm M.1,Wilhelm F. X.1

Affiliation:

1. Unité Propre de Recherche 9002 du Centre National de la Recherche Scientifique, Institut de Biologie Moléculaire et Cellulaire, 67084 Strasbourg, 1 and

2. Unité Mixte de Recherche 216 du Centre National de la Recherche Scientifique, Institut Curie-Biologie, Centre Universitaire, 91405 Orsay, 2 France, and

3. Department of Microbiology, Umea University, S-901 87 Umea, Sweden3

Abstract

ABSTRACT Reverse transcription of the Saccharomyces cerevisiae Ty1 retrotransposon is primed by tRNA i Met base paired to the primer binding site (PBS) near the 5′ end of Ty1 genomic RNA. The 10-nucleotide PBS is complementary to the last 10 nucleotides of the acceptor stem of tRNA i Met . A structural probing study of the interactions between the Ty1 RNA template and the tRNA i Met primer showed that besides interactions between the PBS and the 3′ end of tRNA i Met , three short regions of Ty1 RNA, named boxes 0, 1, and 2.1, interact with the T and D stems and loops of tRNA i Met . To determine if these sequences are important for the reverse transcription pathway of the Ty1 retrotransposon, mutant Ty1 elements and tRNA i Met were tested for the ability to support transposition. We show that the Ty1 boxes and the complementary sequences in the T and D stems and loops of tRNA i Met contain bases that are critical for Ty1 retrotransposition. Disruption of 1 or 2 bp between tRNA i Met and box 0, 1, or 2.1 dramatically decreases the level of transposition. Compensatory mutations which restore base pairing between the primer and the template restore transposition. Analysis of the reverse transcription intermediates generated inside Ty1 virus-like particles indicates that initiation of minus-strand strong-stop DNA synthesis is affected by mutations disrupting complementarity between Ty1 RNA and primer tRNA i Met .

Publisher

American Society for Microbiology

Subject

Cell Biology,Molecular Biology

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