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  • Title: Role of 3':5'-cyclic-AMP-dependent protein kinase in regulation of protein synthesis in reticulocyte lysates.
    Author: Datta A, de Haro C, Sierra JM, Ochoa S.
    Journal: Proc Natl Acad Sci U S A; 1977 Apr; 74(4):1463-7. PubMed ID: 193101.
    Abstract:
    The initiation inhibitor of reticulocyte lysates has been shown by others to be associated with a 3':5'-cyclic-AMP-independent protein kinase that catalyzes the phosphorylation of the small (38,000 daltons) subunit of the polypeptide chain initiation factor eIF-2. This factor forms a ternary complex with Met-tRNAi and GTP which, on interaction with a 40S ribosome, gives rise to a 40S complex. Ternary complex formation is inhibited by prior incubation of partially purified eIF-2 with reticulocyte inhibitor and ATP. The relation between phosphorylation and inactivation of eIF-2 is indicated by the lack of inhibition when ATP is omitted. Translation in hemin-containing reticulocyte lysates is also inhibited by cyclic-AMP-dependent protein kinases or their catalytic subunits. They act by converting proinhibitor (inactive eIF-2 kinase) present in lysates to inhibitor (active eIF-2 kinase). This reaction is analogous to the conversion of inactive phosphorylase kinase to active phosphorylase kinase.
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