The Interaction of P62 with RIP Links the Atypical PKCs to NF-kappaB Activation
Overview
Molecular Biology
Authors
Affiliations
The two members of the atypical protein kinase C (aPKC) subfamily of isozymes (zetaPKC and lambda/iotaPKC) are involved in the control of nuclear factor kappaB (NF-kappaB) through IKKbeta activation. Here we show that the previously described aPKC-binding protein, p62, selectively interacts with RIP but not with TRAF2 in vitro and in vivo. p62 bridges the aPKCs to RIP, whereas the aPKCs link IKKbeta to p62. In this way, a signaling cascade of interactions is established from the TNF-R1 involving TRADD/RIP/p62/aPKCs/IKKbeta. These observations define a novel pathway for the activation of NF-kappaB involving the aPKCs and p62. Consistent with this model, the expression of a dominant-negative mutant lambda/iotaPKC impairs RIP-stimulated NF-kappaB activation. In addition, the expression of either an N-terminal aPKC-binding domain of p62, or its C-terminal RIP-binding region are sufficient to block NF-kappaB activation. Furthermore, transfection of an antisense construct of p62 severely abrogates NF-kappaB activation. Together, these results demonstrate that the interaction of p62 with RIP serves to link the atypical PKCs to the activation of NF-kappaB by the TNFalpha signaling pathway.
p62/SQSTM1 in cancer: phenomena, mechanisms, and regulation in DNA damage repair.
Yang X, Cao X, Zhu Q Cancer Metastasis Rev. 2025; 44(1):33.
PMID: 39954143 PMC: 11829845. DOI: 10.1007/s10555-025-10250-w.
Genetic landscape of congenital pouch colon: systematic review and functional enrichment study.
Phugat S, Sharma J, Kumar S, Jain V, Dhua A, Yadav D Pediatr Surg Int. 2024; 40(1):314.
PMID: 39557707 DOI: 10.1007/s00383-024-05878-8.
The Autophagy Receptor /p62 Is a Restriction Factor of HCMV Infection.
Kramer N, Mato U, Krauter S, Buscher N, Afifi A, Herhaus L Viruses. 2024; 16(9).
PMID: 39339916 PMC: 11436200. DOI: 10.3390/v16091440.
Targeting Autophagy for Acetaminophen-Induced Liver Injury: An Update.
Hinz K, Niu M, Ni H, Ding W Livers. 2024; 4(3):377-387.
PMID: 39301093 PMC: 11412313. DOI: 10.3390/livers4030027.
Liu N, Liu S, Zhang X, Tian W, Jia H, Ye X Oncol Lett. 2024; 28(5):529.
PMID: 39290957 PMC: 11406577. DOI: 10.3892/ol.2024.14662.