Current Genetics

, Volume 15, Issue 2, pp 99–106 | Cite as

Isolation and complete sequence of the yeast isoleucyl-tRNA synthetase gene (ILS1)

  • Duane W. Martindale
  • Zheng Ming Gu
  • Csilla Csank
Original Articles


The isoleucyl-tRNA synthetase gene (ILS1) from the yeast Saccharomyces cerevisiae was cloned and sequenced. This gene was initially cloned because it cross-hybridizated to what is now presumed to be the isoleucyl-tRNA synthetase gene (cupC) from the protozoan Tetrahymena hhermophila. The ILS1 gene was determined to be 1,072 amino acids in length. A comparison with a recently published sequence of ILS1 1 from another laboratory (Englisch et al. 1987) was made and differences noted. Two promoter elements were detected, one for general amino acid control and one for constitutive transcription. A heat shock protein (hsp70) gene (probably SSA3) was found 237 by upstream from the ILS1 translation start site. The ILS1 amino acid sequence was compared to isoleucyl-tRNA synthetases from other organisms, as well as to valyl-, leucyl- and methionyl-tRNA synthetases. Regions of conservation between these enzymes were found.

Key words

Yeast Isoleucyl-tRNA synthetase Isoleucine Evolution 


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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Duane W. Martindale
    • 1
  • Zheng Ming Gu
    • 1
  • Csilla Csank
    • 1
  1. 1.Department of MicrobiologyMacdonald College of McGill UniversitySte Anne de BellevueCanada

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