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Nucleic Acids Research, 1985, Vol. 13, No. 17 6171-6183
© 1985

Articles

Cloning and characterization of the gene for the yeast cytoplasmic threonyl-tRNA synthetase

Louis K. Pape and Alexander Tzagoloff

Department of Biological Sciences, Columbia University New York, NY 10027, USA

Received May 13, 1985. Revised July 24, 1985. Accepted July 24, 1985.

A fragment of DNA from the yeast nuclear gene MST1 that codes for the mitochondrial tRNAThr1 synthetase was used as a probe to screen for other yeast threonyl-tRNA synthetase genes. At low stringency, the MST1 probe hybridizes strongly to a 6.6 kb EcoRl fragment of yeast genomic DNA with the homologous gene and in addition hybridizes more weakly to a smaller 3.6 kb EcoRl fragment with a second threonyl-tRNA synthetase gene (THS1). To clone THS1, a library was constructed by ligation to pUC18 of size selected (3–4.5 kb) EcoRI fragments of genomic DNA. Several clones containing the 3.6 kb EcoRI fragment were isolated. A 2,202 nucleotide long open reading frame corresponding to THS1 has been identified in the cloned fragment of DNA. The predicted protein encoded by THS1 is 38% identical to the E. coli threonyl-tRNA synthetase over the latter's length (642 amino acids) and is 42% identical to the predicted MST1 product over its 462 residues. In situ disruption of the chromosomal copy of THS1 is lethal to die cell, indicating that this gene codes for the cytoplasmic threonyl-tRNA synthetase.


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