A multifunctional repeated motif is present in human bifunctional tRNA synthetase

Seung Bae Rho, Jong Sang Lee, Eui Jun Jeong, Key Sun Kim, Yang Gyun Kim, Sunghoon Kim

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11 Citations (Scopus)


Tandem repeats located in the human bifunctional glutamyl-prolyl-tRNA synthetase (EPRS) have been found in many different eukaryotic tRNA synthetases and were previously shown to interact with another distinct repeated motifs in human isoleucyl-tRNA synthetase. Nuclear magnetic resonance and differential scanning calorimetry analyses of an isolated EPRS repeat showed that it consists of a helix-turn-helix with a melting temperature of 59 °C. Specific interaction of the EPRS repeats with those of isoleucyl-tRNA synthetase was confirmed by in vitro binding assays and shown to have a dissociation constant of approximately 2.9 μM. The EPRS repeats also showed the binding activity to the N-terminal motif of arginyl-tRNA synthetase as well as to various nucleic acids, including tRNA. Results of the present work suggest that the region comprising the repeated motifs of EPRS provides potential sites for interactions with various biological molecules and thus plays diverse roles in the cell.

Original languageEnglish
Pages (from-to)11267-11273
Number of pages7
JournalJournal of Biological Chemistry
Issue number18
Publication statusPublished - 1998 May 1

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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