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J Biol Chem. 2016 Apr 15;291(16):8338-48. doi: 10.1074/jbc.M116.717322. Epub 2016 Feb 16.

Intramolecular Interactions and Regulation of Cofactor Binding by the Four Repressive Elements in the Caspase Recruitment Domain-containing Protein 11 (CARD11) Inhibitory Domain.

Author information

1
From the Department of Biological Chemistry, Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
2
From the Department of Biological Chemistry, Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 joel.pomerantz@jhmi.edu.

Abstract

The CARD11 signaling scaffold transmits signaling between antigen receptors on B and T lymphocytes and the transcription factor NF-κB during the adaptive immune response. CARD11 activity is controlled by an inhibitory domain (ID), which participates in intramolecular interactions and prevents cofactor binding prior to receptor triggering. Oncogenic CARD11 mutations associated with the activated B cell-like subtype of diffuse large B cell lymphoma somehow perturb ID-mediated autoinhibition to confer CARD11 with the dysregulated spontaneous signaling to NF-κB that is required for the proliferation and survival of the lymphoma. Here, we investigate how the four repressive elements (REs) we have discovered in the CARD11 ID function to inhibit CARD11 activity with cooperativity and redundancy. We find that each RE contributes to the maintenance of the closed inactive state of CARD11 that predominates in the absence of receptor engagement. Each RE also contributes to the prevention of Bcl10 binding in the basal unstimulated state. RE1, RE2, and RE3 participate in intramolecular interactions with other CARD11 domains and share domain targets for binding. Remarkably, diffuse large B cell lymphoma-associated gain-of-function mutations in the caspase recruitment domain, LATCH, or coiled coil can perturb intramolecular interactions mediated by multiple REs, suggesting how single amino acid oncogenic CARD11 mutations can perturb or bypass the action of redundant inhibitory REs to achieve the level of hyperactive CARD11 signaling required to support lymphoma growth.

KEYWORDS:

CARD11; NF-κB (NF-KB); T-cell receptor; autoinhibitory domain; diffuse large B cell lymphoma; gene regulation; lymphoma; oncogene; scaffold protein; signal transduction

PMID:
26884334
PMCID:
PMC4861409
DOI:
10.1074/jbc.M116.717322
[Indexed for MEDLINE]
Free PMC Article

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