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Method of isolation of phenylalanyl-tRNA synthetase from Thermus thermophilus HB8 is described, including chromatography on DEAE-sepharose, ammonium sulfate fractionation, hydrofobic chromatography on Toyopearl, gel filtration on ultrogel AcA-34, chromatography on phenylalanylaminohexyl-sepharose and heparine-sepharose. Yield of the purified enzyme was 10 mg from 1 kg of T. thermophilus cells. The enzyme is found to consist of two types of subunits with molecular masses 92 and 36 kDa and is likely to be a tetramer protein with molecular mass 250 kDa. Crystals of phenylalanyl-tRNA synthetase suitable for X-ray structural studies have been obtained.
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