p62 forms a ternary complex with PKC zeta and PAR-4 and antagonizes PAR-4-induced PKC zeta inhibition

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It has been reported that prostate apoptosis response-4 (PAR-4) binds to and inhibits protein kinase Czeta (PKCzeta) which phosphorylates IkappaB kinase beta (IKKbeta) for nuclear factor kappaB (NFkappaB) activation, while p62 binds to and recruits PKCzeta to the NFkappaB signaling complex. Thus, a mechanism to coordinate the two binding proteins for the regulation of PKCzeta is expected to exist. The present data show that p62 and PAR-4 do not compete for PKCzeta binding but directly interact each other and form a ternary complex with PKCzeta. Furthermore, p62 not only enhances the catalytic activity of PKCzeta but also reactivates catalytically inactive PAR-4-bound PKCzeta. As the result, overexpression of p62 protects cells front PAR-4-mediated inactivation of NFkappaB and apoptotic death. Thus, the regulatory role of p62 for free and PAR-4-bound PKCzeta is important in activation of NFkappaB. (C) 2002 Published by Elsevier Science B.V. on behalf of the Federation of European Biochemical Societies.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2002-01
Language
English
Article Type
Article
Keywords

PROTEIN-KINASE-C; KAPPA-B ACTIVATION; SIGNAL-TRANSDUCTION; BINDING-PROTEIN; APOPTOSIS; EXPRESSION; ISOFORMS; PATHWAY; ALPHA

Citation

FEBS LETTERS, v.510, no.1-2, pp.57 - 61

ISSN
0014-5793
URI
http://hdl.handle.net/10203/85157
Appears in Collection
BS-Journal Papers(저널논문)
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