Nuclear IKKβ Is an Adaptor Protein for IκBα Ubiquitination and Degradation in UV-Induced NF-κB Activation

Tsuchiya Yoshihiro

Asano Tomoichiro

Nakayama Keiko

Kato Tomohisa, Jr

Karin Michael

Kamata Hideaki

Molecular Cell

Proinflammatory cytokines activate NF-κB using the IκB kinase (IKK) complex that phosphorylates inhibitory proteins (IκBs) at N-terminal sites resulting in their ubiquitination and degradation in the cytoplasm. Although ultraviolet (UV) irradiation does not lead to IKK activity, it activates NF-κB by an unknown mechanism through IκBα degradation without N-terminal phosphorylation. Here, we describe an adaptor function of nuclear IKKβ in UV-induced IκBα degradation. UV irradiation induces the nuclear translocation of IκBα and association with IKKβ, which constitutively interacts with β-TrCP through heterogeneous ribonucleoprotein-U (hnRNP-U) leading to IκBα ubiquitination and degradation. Furthermore, casein kinase 2 (CK2) and p38 associate with IKKβ and promote IκBα degradation by phosphorylation at C-terminal sites. Thus, nuclear IKKβ acts as an adaptor protein for IκBα degradation in UV-induced NF-κB activation. NF-κB activated by the nuclear IKKβ adaptor protein suppresses anti-apoptotic gene expression and promotes UV-induced cell death.

SIGNALING

CELLCYCLE

PROTEINS

Biology [ 460 ]

eng

Cell Press

Copyright (c) 2010 Elsevier Inc.

[ISSN] 1097-2765

[DOI] 10.1016/j.molcel.2010.07.030

[NCID] AA1119005X

[DOI] http://dx.doi.org/10.1016/j.molcel.2010.07.030