title: Posttranslational modifications on protein kinase c isozymes. Effects of epinephrine and phorbol esters.
abstract: The posttranslational modifications induced on PKC isozymes as result of their activation were investigated. Reciprocal immunoprecipitations followed by Western blot analysis demonstrated that all PKC isozymes expressed in rat hepatocytes are modified by tyrosine nitration and tyrosine phosphorylation in different ways upon exposure of cells to a direct PKC activator (TPA), or to an extracellular ligand known to activate PKC-dependent pathways (epinephrine). Our data demonstrate for the first time that all PKC isozymes are also dynamically modified by O-linked beta-N-acetylglucosamine (O-GlcNAc); the presence of this modification was confirmed in part by FT-ICR mass spectrometry analysis. Interestingly, the O-GlcNAc modified Ser or Thr were mapped at similar positions in several PKC isozymes. The biochemical meaning of these posttranslational modifications was investigated for PKC alpha and delta. It was found that the PKC phosphorylation status of both isozymes in tyrosine and serine residues seems to regulate directly the enzyme activity since catalytic inactivation correlate with dephosphorylation of Ser at the C-terminus autophosphorylation sites of each PKC isozyme, and with an increase in the level of tyrosine phosphorylation. Whereas none of the other posttranslational modifications showed per se a direct effect in PKC delta activity, increased tyrosine nitration and O-GlcNAc modifications correlate negatively with PKCalpha activity.
authors.affiliation: Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, México, DF, Mexico. rmartha@servidor.unam.mx
authors.forename: Martha
authors.initials: M
authors.lastname: Robles-Flores
authors.forename: Lennon
authors.initials: L
authors.lastname: Meléndez
authors.forename: Wendy
authors.initials: W
authors.lastname: García
authors.forename: Guillermo
authors.initials: G
authors.lastname: Mendoza-Hernández
authors.forename: Tukiet T
authors.initials: TT
authors.lastname: Lam
authors.forename: Cristina
authors.initials: C
authors.lastname: Castañeda-Patlán
authors.forename: Héctor
authors.initials: H
authors.lastname: González-Aguilar
mesh_terms: D000117:Acetylglucosamine / Q000378:metabolism; D000818:Animals; D004789:Enzyme Activation; D004837:Epinephrine / Q000494:pharmacology*; D022781:Hepatocytes / Q000187:drug effects / Q000201:enzymology; D007527:Isoenzymes / Q000737:chemistry / Q000378:metabolism; D008297:Male; D013058:Mass Spectrometry; D011493:Protein Kinase C / Q000737:chemistry / Q000378:metabolism*; D011499:Protein Processing, Post-Translational; D051381:Rats; D017208:Rats, Wistar; D012694:Serine / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D013912:Threonine / Q000378:metabolism; D014443:Tyrosine / Q000378:metabolism
chemical_list: D007527:Isoenzymes; D013912:Threonine; D014443:Tyrosine; D012694:Serine; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate; D000117:Acetylglucosamine; D004837:Epinephrine