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Bardet, M.* ; Seeholzer, T. ; Unterreiner, A.* ; Woods, S. ; Krappmann, D. ; Bornancin, F.*

MALT1 activation by TRAF6 needs neither BCL10 nor CARD11.

Biochem. Biophys. Res. Commun. 506, 48-52 (2018)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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The MALT1 (Mucosa associated lymphoid tissue lymphoma translocation protein 1) paracaspase couples antigen receptors on lymphocytes to downstream signaling events. Activation of MALT1 is known to involve stimulus-dependent CBM complex formation, that is, the recruitment of BCL10-bound MALT1 to a CARD-Coiled Coil protein. Beyond this canonical, CBM-dependent mechanism of MALT1 activation, recent studies suggest that MALT1 protease activity may be triggered by alternative mechanisms. For instance, the E3-ligase TRAF6 can activate MALT1 proteolytic function and induce MALT1 auto-cleavage. However, the interplay between CBM and TRAF6 with regard to MALT1 activation has remained incompletely elucidated. Here, by generating CRISPR/Cas9-derived knock-out Jurkat T-cells, we show that TRAF6 was dispensable for CARD11/BCL10-dependent MALT1 activation upon T-cell stimulation. However, ectopically-expressed TRAF6 could induce MALT1 activity in Jurkat T-cells devoid of either CARD11 or BCL10. These data provide unequivocal evidence that TRAF6-mediated MALT1 activation does not require the upstream scaffold CARD11 or the interaction between MALT1 and BCL10. Thus, TRAF6 may be part of a previously unidentified non-canonical pathway that triggers MALT1 protease activity independently of canonical CBM signalosomes. (C) 2018 Elsevier Inc. All rights reserved.

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