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Preparation and activity of synthetic unmodified mammalian tRNAiMet in initiation of translation in vitro

Published online by Cambridge University Press:  11 January 2002

TATYANA V. PESTOVA  and
CHRISTOPHER U.T. HELLEN
TATYANA V. PESTOVA
Affiliation:
Department of Microbiology and Immunology, State University of New York Health Sciences Center at Brooklyn, Brooklyn, New York 11203-2098, USA A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, 119899 Moscow, Russia
CHRISTOPHER U.T. HELLEN
Affiliation:
Department of Microbiology and Immunology, State University of New York Health Sciences Center at Brooklyn, Brooklyn, New York 11203-2098, USA
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Abstract

Translation of eukaryotic mRNA is initiated by a unique amino-acyl tRNA, Met-tRNAiMet, which passes through a complex series of highly specific interactions with components of the translation apparatus during the initiation process. To facilitate in vitro biochemical and molecular biological analysis of these interactions in fully reconstituted translation initiation reactions, we generated mammalian tRNAiMet by in vitro transcription that lacked all eight base modifications present in native tRNAiMet. Here we report a method for in vitro transcription and aminoacylation of synthetic unmodified initiator tRNAiMet that is active in every stage of the initiation process, including aminoacylation by methionyl-tRNA synthetase, binding of Met-tRNAiMet to eIF2-GTP to form a ternary complex, binding of the ternary complexes to 40S ribosomal subunits to form 43S complexes, binding of the 43S complex to a native capped eukaryotic mRNA, and scanning on its 5′ untranslated region to the correct initiation codon to form a 48S complex, and finally joining with a 60S subunit to assemble an 80S ribosome that is competent to catalyze formation of the first peptide bond using the [35S]methionine residue attached to the acceptor terminus of the tRNAiMet transcript.

Keywords

eukaryotic initiation factorinitiator tRNAribosometranslation
Type
METHODS
Information
RNA , Volume 7 , Issue 10 , October 2001 , pp. 1496 - 1505
Copyright
2001 RNA Society

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