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TRAF2-binding BIR1 domain of c-IAP2/MALT1 fusion protein is essential for activation of NF-κB

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Abstract

Marginal zone mucosa-associated lymphoid tissue (MALT) B-cell lymphoma is the most common extranodal non-Hodgkin lymphoma. The t(11;18)(q21;q21) translocation occurs frequently in MALT lymphomas and creates a chimeric NF-κB-activating protein containing the baculoviral IAP repeat (BIR) domains of c-IAP2 (inhibitor of apoptosis protein 2) fused with portions of the MALT1 protein. The BIR1 domain of c-IAP2 interacts directly with TRAF2 (TNFα-receptor-associated factor–2), but its role in NF-κB activation is still unclear. Here, we investigated the role of TRAF2 in c-IAP2/MALT1-induced NF-κB activation. We show the BIR1 domain of c-IAP2 is essential for NF-κB activation, whereas BIR2 and BIR3 domains are not. Studies of c-IAP2/MALT1 BIR1 mutant (E47A/R48A) that fails to activate NF-κB showed loss of TRAF2 binding, but retention of TRAF6 binding, suggesting that interaction of c-IAP2/MALT1 with TRAF6 is insufficient for NF-κB induction. In addition, a dominant-negative TRAF2 mutant or downregulation of TRAF2 achieved by small interfering RNA inhibited NF-κB activation by c-IAP2/MALT1 showing that TRAF2 is indispensable. Comparisons of the bioactivity of intact c-IAP2/MALT1 oncoprotein and BIR1 E47A/R48A c-IAP2/MALT1 mutant that cannot bind TRAF2 in a lymphoid cell line provided evidence that TRAF2 interaction is critical for c-IAP2/MALT1-mediated increases in the NF-κB activity, increased expression of endogenous NF-κB target genes (c-FLIP, TRAF1), and resistance to apoptosis.

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  1. Program on Apoptosis and Cell Death Research, Cancer Center, Burnham Institute for Medical Research, La Jolla, CA, USA

    J B Garrison, T Samuel & J C Reed

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  1. J B Garrison
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  2. T Samuel
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Correspondence to J C Reed.

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Garrison, J., Samuel, T. & Reed, J. TRAF2-binding BIR1 domain of c-IAP2/MALT1 fusion protein is essential for activation of NF-κB. Oncogene 28, 1584–1593 (2009). https://doi.org/10.1038/onc.2009.17

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