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Isoelectric points and isoelectric focusing behaviour of 10 highly purified eukaryotic aminoacyl-tRNA synthetases from 3 sources, Saccharomyces cerevisiae, Euglena gracilis and Phaseolus vulgaris were examined. The pI-values measured on polyacrylamide gels under native conditions are situated between pH 5.0-7.5. A microheterogeneity was observed for 9 enzymes appearing otherwise homogeneous on gel electrophoresis. A compilation of the isoelectric points of aminoacyl-tRNA synthetases is given and literature data are compared with our experimental results.
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Lorber et al. (1983) studied this question.
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