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- W1561878609 abstract "There are at least three isozymes (C alpha, C beta, and C gamma) of the mammalian catalytic (C) subunit of cAMP-dependent protein kinase (PKA) (Beebe, S., Oyen, O., Sandberg, M., Froysa, A., Hansson, V., and Jahnsen, T. (1990) Mol. Endocrinol. 4, 465-475). To compare the C gamma and C alpha isozymes, the respective cDNAs were expressed in permanently transformed Kin-8 PKA-deficient Y1 adrenal cells using the mouse metallothionein promoter. The recombinant C subunits were characterized as immunoreactive, zinc-inducible, cAMP-dependent kinase activities. In contrast to C alpha, histone was a better substrate than Leu-Arg-Arg-Ala-Ser-Leu-Gly (Kemptide) for C gamma. Furthermore, C gamma histone kinase activity was not inhibited by the protein kinase inhibitor peptide (5-24 amide), which has been widely used as a PKA-specific inhibitor. The major C gamma peak (type I) eluted from DEAE-Sepharose at a higher NaCl concentration (120 mM) than the C alpha type I eluted (70 mM). C gamma and C alpha type II eluted between 220 and 240 mM NaCl. C gamma required higher concentrations of cAMP than C alpha did for dissociation from the mutant type I holoenzyme. These differences provided a basis for the separation of the mutant RI-associated isozymes on DEAE-Sepharose. Both C alpha (41-42 kDa) and C gamma (39-40 kDa) were identified by a C subunit antibody after sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblot analysis. Zinc induced the PKA-mediated rounding phenotype in C gamma and C alpha clones, thereby restoring the cells to the parent Y1 adrenal cell phenotype. Collectively, these data indicate that C gamma is an active PKA C subunit but suggest that C gamma and C alpha have different protein and peptide recognition determinants." @default.
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- W1561878609 date "1992-12-01" @default.
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- W1561878609 title "The C gamma subunit is a unique isozyme of the cAMP-dependent protein kinase." @default.
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- W1561878609 doi "https://doi.org/10.1016/s0021-9258(19)74069-1" @default.
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