J. Biol. Chem., Vol. 259, Issue 18, 11160-11161, Sep, 1984
Threonyl-tRNA synthetase from Chinese hamster ovary cells is phosphorylated on serine
SC Gerken and SM Arfin
A Chinese hamster ovary cell line, 2000A, in which threonyl-tRNA synthetase
accounts for 1.5% of the total soluble protein, was used to demonstrate
that this enzyme is a phosphoprotein. Threonyl-tRNA synthetase was isolated
by immunoprecipitation from cells labeled with 32Pi for 18 h. Phosphoamino
acid analysis of radiolabeled threonyl-tRNA synthetase showed that
phosphorylation occurs on serine.