Gain-of-function mutations in CARD11 promote enhanced aggregation and idiosyncratic signalosome assembly.

Abstract:

:BENTA (B cell Expansion with NF-κB and T cell Anergy) is a novel lymphoproliferative disorder caused by germline, gain-of-function (GOF) mutations in the lymphocyte-restricted scaffolding protein CARD11. Similar somatic CARD11 mutations are found in lymphoid malignancies such as diffuse large B cell lymphoma (DLBCL). Normally, antigen receptor (AgR) engagement converts CARD11 into an active conformation that nucleates a signalosome required for IκB kinase (IKK) activation and NF-κB nuclear translocation. However, GOF CARD11 mutants drive constitutive NF-κB activity without AgR stimulation. Here we show that unlike wild-type CARD11, GOF CARD11 mutants can form large, peculiar cytosolic protein aggregates we term mCADS (mutant CARD11 dependent shells). MALT1 and phospho-IKK are reliably colocalized with mCADS, indicative of active signaling. Moreover, endogenous mCADS are detectable in ABC-DLBCL lines harboring similar GOF CARD11 mutations. The unique aggregation potential of GOF CARD11 mutants may represent a novel therapeutic target for treating BENTA or DLBCL.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Stinson JR,Dorjbal B,McDaniel DP,David L,Wu H,Snow AL

doi

10.1016/j.cellimm.2020.104129

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

104129

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(19)30571-4

journal_volume

353

pub_type

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