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. 2004 Mar 15;378(Pt 3):867–876. doi: 10.1042/BJ20031736

The inhibitor ABIN-2 disrupts the interaction of receptor-interacting protein with the kinase subunit IKKgamma to block activation of the transcription factor NF-kappaB and potentiate apoptosis.

Wei-Kuang Liu 1, Pei-Fen Yen 1, Chia-Yi Chien 1, Ming-Ji Fann 1, Jin-Yuan Su 1, Chen-Kung Chou 1
PMCID: PMC1224013  PMID: 14653779

Abstract

NF-kappaB (nuclear factor kappaB) proteins are key transcription factors that regulate gene expression in response to various extracellular stimuli. The pathway leading to the activation of NF-kappaB involves a complicated network that includes a number of signalling molecules. The recent identification of a wide range of negative regulators of NF-kappaB has given another layer of complexity in NF-kappaB activation. We and others have previously identified the protein ABIN-2 (A20 binding inhibitor of NF-kappaB 2) as an inhibitor of NF-kappaB activation. In the present paper, we demonstrate that ABIN-2 exerts its inhibitory function by blocking the interaction of RIP (receptor-interacting protein) with the downstream effector IKKgamma, a non-kinase component of the IkappaB (inhibitory kappaB) kinase complex. When overexpressed in cells, ABIN-2 bound to IKKgamma and prevented the association of IKKgamma with RIP. By a deletion mapping, a stretch of 50 amino acids on ABIN-2 is found to be essential for its interaction with IKKgamma. The ABIN-2 mutant that lacked these 50 amino acids did not interact with IKKgamma and, consequently, failed to inhibit NF-kappaB activation. Strikingly, a portion of RIP, which is similar to this 50-residue domain of ABIN-2, is also essential for RIP interaction with IKKgamma. The RIP mutant with deletion of this similar region did not associate with IKKgamma and had substantial reduction of its ability to mediate NF-kappaB activation. Taken together, these conserved 50 residues of ABIN-2 and RIP define a novel structural domain in mediating a key step in the NF-kappaB signalling pathway through the interaction with IKKgamma. Finally, the signalling pathway of NF-kappaB activation is known to promote survival in many cellular events. The mechanism for decision between cell death and survival is under fine regulation. In the present paper, we demonstrated further that the expression of ABIN-2 could promote the RIP-mediated apoptosis by presumably suppressing the anti-apoptotic effect of NF-kappaB.

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