title: The product of par-4, a gene induced during apoptosis, interacts selectively with the atypical isoforms of protein kinase C.
abstract: The atypical PKCs are involved in a number of important cellular functions, including cell proliferation. We report here that the product of the par-4 gene specifically interacts with the regulatory domains of zeta PKC and lambda/LPKC, which dramatically inhibits their enzymatic activity. This is particularly challenging, because expression of par-4 has been shown to correlate with growth inhibition and apoptosis. Results are shown here demonstrating that the expression of par-4 in NIH-3T3 cells induces morphological changes typical of apoptosis, which are abrogated by cotransfection of either wild-type zeta PKC or lambda/LPKC, but not by their respective kinase-inactive mutants. These findings support a role for the atypical PKC subspecies in the control of cell growth and survival.
authors.affiliation: Centro de Biología Molecular Consejo Superior de Investigaciones Cientificas Universidad Autónoma de Madrid.
authors.forename: M T
authors.initials: MT
authors.lastname: Díaz-Meco
authors.forename: M M
authors.initials: MM
authors.lastname: Municio
authors.forename: S
authors.initials: S
authors.lastname: Frutos
authors.forename: P
authors.initials: P
authors.lastname: Sanchez
authors.forename: J
authors.initials: J
authors.lastname: Lozano
authors.forename: L
authors.initials: L
authors.lastname: Sanz
authors.forename: J
authors.initials: J
authors.lastname: Moscat
mesh_terms: D016475:3T3 Cells; D000595:Amino Acid Sequence; D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D051017:Apoptosis Regulatory Proteins; D001426:Bacterial Proteins / Q000235:genetics; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D002460:Cell Line; D002522:Chlorocebus aethiops; D003001:Cloning, Molecular; D004791:Enzyme Inhibitors; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D007527:Isoenzymes / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051379:Mice; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000502:physiology; D011485:Protein Binding; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D017231:Proto-Oncogene Proteins c-mos / Q000378:metabolism; D019908:Proto-Oncogene Proteins c-raf; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012697:Serine Endopeptidases / Q000235:genetics; D016335:Zinc Fingers; D000099160:LexA Repressor Protein
chemical_list: D051017:Apoptosis Regulatory Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; D004791:Enzyme Inhibitors; D047908:Intracellular Signaling Peptides and Proteins; D007527:Isoenzymes; D011493:Protein Kinase C; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D017231:Proto-Oncogene Proteins c-mos; D019908:Proto-Oncogene Proteins c-raf; D011993:Recombinant Fusion Proteins; D012697:Serine Endopeptidases; D000099160:LexA Repressor Protein; C101296:prostate apoptosis response-4 protein