In silico detection of tRNA sequence features characteristic to aminoacyl-tRNA synthetase class membership

Éena Jakó, Péter Ittzés, Áron Szenes, Ádám Kun, Eörs Szathmáry, Gábor Pál

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Aminoacyl tRNA synthetases (aaRS) are grouped into Class I and II based on primary and tertiary structure and enzyme properties suggesting two independent phylogenetic lineages. Analogously, tRNA molecules can also form two respective classes, based on the class membership of their corresponding aaRS. Although some aaRS - tRNA interactions are not extremely specific and require editing mechanisms to avoid misaminoacylation, most aaRS - tRNA interactions are rather stereospecific. Thus, class-specific aaRS features could be mirrored by class-specific tRNA features. However, previous investigations failed to detect conserved class-specific nucleotides. Here we introduce a discrete mathematical approach that evaluates not only class-specific 'strictly present', but also 'strictly absent' nucleotides. The disjoint subsets of these elements compose a unique partition, named extended consensus partition (ECP). By analyzing the ECP for both Class I and II tDNA sets from 50 (13 archaeal, 30 bacterial and 7 eukaryotic) species, we could demonstrate that class-specific tRNA sequence features do exist, although not in terms of strictly conserved nucleotides as it had previously been anticipated. This finding demonstrates that important information was hidden in tRNA sequences inaccessible for traditional statistical methods. The ECP analysis might contribute to the understanding of tRNA evolution and could enrich the sequence analysis tool repertoire.

Original languageEnglish
Pages (from-to)5593-5609
Number of pages17
JournalNucleic acids research
Volume35
Issue number16
DOIs
Publication statusPublished - Aug 1 2007

ASJC Scopus subject areas

  • Genetics

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