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Human mitochondrial leucyl-tRNA synthetase with high activity produced from Escherichia coli. | LitMetric
The processing of human mitochondrial leucyl-tRNA synthetase had been previously investigated in insect cell. In the present work, the gene encoding human mitochondrial leucyl-tRNA synthetase with the same N-terminus as that processed in the mitochondria of insect cell was cloned and expressed in Escherichia coli. The enzyme was purified by affinity chromatography on Ni-NTA column. About 6 mg of human mitochondrial leucyl-tRNA synthetase was obtained from 1 liter of culture. The specific activity of the purified enzyme is 127.7 units/mg, the highest activity of the reported results; this enzyme has the potential for characterizing the mitochondrial tRNA mutants associated with some human mitochondrion-related neuromuscular disorders. The kinetic constants for three substrates: leucine, ATP, and E. coli tRNA1Leu (CAG) in the leucylation reaction are also reported herein.
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