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Threonyl-tRNA synthetase is phosphorylated in Chinese hamster ovary cells labeled with 2 P i [(1984) J. Biol. Chem. 259,11160-11161]. Phosphorylation of the purified synthetase from rat liver has been examined with five different protein kinases. Three of the enzymes phosphorylate the synthetase, protease activated kinase I, the cAMP-dependent protein kinase, and the Ca 2+...
The specificity of the heme-regulated protein kinase (HRI) was investigated further by utilizing the isolated 38000 Da subunit (α subunit) polypeptide of eIF-2 as the substrate. For this purpose, the three subunit polypeptides of eIF-2 (38000 Da, α, 50000 Da, β; and 52000 Da, γ) were resolved by reversed-phase high performance liquid chromatography (HPLC). Results show that HRI is incapable of phosphorylating...
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