Abstract:
:The recognition of human tRNA(Leu) or tRNA(Ser) by cognate aminoacyl- tRNA synthetases has distinct requirements. Only one base change (A73-->G) in tRNA(Leu) is required to generate an efficient serine acceptor in vitro, whereas several changes in three structural domains (the acceptor stem, DHU loop and long extra arm) of tRNA(Ser) are necessary in order to produce a leucine acceptor. Hence, the molecular basis for the discrimination between human tRNA(Ser) and tRNA(Leu) by the seryl-tRNA synthetase depends almost exclusively on a highly specific recognition of the discriminator base G73. In order to elucidate the specific role of the functional groups of this base in discrimination, tRNA(Ser) constructs were made which contain the artificial base analogues 2-aminopurine riboside or inosine at the discriminator position 73. Aminoacylation of these constructs by a HeLa S100 extract showed that molecules with 2-aminopurine riboside, but not with inosine, in position 73 could be serylated at low efficiency. However, the 2-aminopurine riboside and the inosine derivatives of tRNA(Ser) were equally efficient competitive inhibitors of serylation, whereas tRNAs(Ser) with any other natural base at position 73 did not competitively inhibit serylation of tRNA(Ser). This was in contrast to leucylation of tRNA(Leu), where tRNA(Leu) transcripts with any other nucleotide in the discriminator position acted as strong competitive inhibitors. These results suggest that the discriminator bases in human tRNA(Ser) and tRNA(Leu) play completely different roles in recognition of the tRNAs by their cognate aminoacyl-tRNA synthetases.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Breitschopf K,Gross HJdoi
10.1093/nar/24.3.405subject
Has Abstractpub_date
1996-02-01 00:00:00pages
405-10issue
3eissn
0305-1048issn
1362-4962pii
5c0203journal_volume
24pub_type
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