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Molecular and Cellular Biology, October 2002, p. 7158-7167, Vol. 22, No. 20
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.20.7158-7167.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Interleukin-1 (IL-1) Receptor-Associated Kinase-Dependent IL-1-Induced Signaling Complexes Phosphorylate TAK1 and TAB2 at the Plasma Membrane and Activate TAK1 in the Cytosol

Zhengfan Jiang,1 Jun Ninomiya-Tsuji,2,3 Youcun Qian,1 Kunihiro Matsumoto,2,3 and Xiaoxia Li1*

Department of Immunology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195,1 Department of Molecular Biology, Graduate School of Science, Nagoya University,2 CREST, Jan Science and Technology Corporation, Chikusa-ku, Nagoya 464-8602, Japan3

Received 24 April 2002/ Returned for modification 1 July 2002/ Accepted 16 July 2002

Interleukin-1 (IL-1) receptor-associated kinase (IRAK) plays an important role in the sequential formation and activation of IL-1-induced signaling complexes. Previous studies showed that IRAK is recruited to the IL-1-receptor complex, where it is hyperphosphorylated. We now find that the phosphorylated IRAK in turn recruits TRAF6 to the receptor complex (complex I), which differs from the previous concept that IRAK interacts with TRAF6 after it leaves the receptor. IRAK then brings TRAF6 to TAK1, TAB1, and TAB2, which are preassociated on the membrane before stimulation to form the membrane-associated complex II. The formation of complex II leads to the phosphorylation of TAK1 and TAB2 on the membrane by an unknown kinase, followed by the dissociation of TRAF6-TAK1-TAB1-TAB2 (complex III) from IRAK and consequent translocation of complex III to the cytosol. The formation of complex III and its interaction with additional cytosolic factors lead to the activation of TAK1, resulting in NF-{kappa}B and JNK activation. Phosphorylated IRAK remains on the membrane and eventually is ubiquitinated and degraded. Taken together, the new data reveal that IRAK plays a critical role in mediating the association and dissociation of IL-1-induced signaling complexes, functioning as an organizer and transporter in IL-1-dependent signaling.

* Corresponding author. Mailing address: Department of Immunology, Lerner Research Institute, Cleveland Clinic Foundation, 9500 Euclid Ave., Cleveland, OH 44195. Phone: (216) 445-8706. Fax: (216) 444-9329. E-mail: Lix{at}ccf.org.

Molecular and Cellular Biology, October 2002, p. 7158-7167, Vol. 22, No. 20
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.20.7158-7167.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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