Abstract
CARD9 is a central component of anti-fungal innate immune signaling via C-type lectin receptors, and several immune-related disorders are associated with CARD9 alterations. Here, we used a rare CARD9 variant that confers protection against inflammatory bowel disease as an entry point to investigating CARD9 regulation. We showed that the protective variant of CARD9, which is C-terminally truncated, acted in a dominant-negative manner for CARD9-mediated cytokine production, indicating an important role for the C terminus in CARD9 signaling. We identified TRIM62 as a CARD9 binding partner and showed that TRIM62 facilitated K27-linked poly-ubiquitination of CARD9. We identified K125 as the ubiquitinated residue on CARD9 and demonstrated that this ubiquitination was essential for CARD9 activity. Furthermore, we showed that similar to Card9-deficient mice, Trim62-deficient mice had increased susceptibility to fungal infection. In this study, we utilized a rare protective allele to uncover a TRIM62-mediated mechanism for regulation of CARD9 activation.
Copyright © 2015 Elsevier Inc. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Adjuvants, Immunologic / pharmacology
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Animals
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CARD Signaling Adaptor Proteins / chemistry
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CARD Signaling Adaptor Proteins / deficiency
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CARD Signaling Adaptor Proteins / genetics
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CARD Signaling Adaptor Proteins / physiology*
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Candidiasis, Invasive / genetics
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Candidiasis, Invasive / immunology*
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Colitis / chemically induced
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Colitis / genetics
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Colitis / prevention & control
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Cytokines / biosynthesis
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Dendritic Cells / immunology
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Dendritic Cells / metabolism
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Genes, Dominant
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Genetic Predisposition to Disease
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HEK293 Cells
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HeLa Cells
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Humans
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Inflammatory Bowel Diseases / genetics
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Mice
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Mice, 129 Strain
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Mice, Knockout
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Protein Interaction Mapping
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Protein Isoforms / chemistry
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Protein Isoforms / genetics
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Protein Isoforms / physiology
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Protein Processing, Post-Translational
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Protein Structure, Tertiary
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Receptors, Angiotensin / chemistry
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Receptors, Angiotensin / deficiency
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Receptors, Angiotensin / physiology*
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Receptors, Endothelin / chemistry
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Receptors, Endothelin / deficiency
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Receptors, Endothelin / physiology*
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Recombinant Fusion Proteins / metabolism
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Signal Transduction
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Specific Pathogen-Free Organisms
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Tripartite Motif Proteins
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Ubiquitin-Protein Ligases / chemistry
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Ubiquitin-Protein Ligases / physiology*
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Ubiquitination
Substances
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Adjuvants, Immunologic
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CARD Signaling Adaptor Proteins
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CARD9 protein, human
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Card9 protein, mouse
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Cytokines
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Dear1 protein, mouse
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Protein Isoforms
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Receptors, Angiotensin
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Receptors, Endothelin
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Recombinant Fusion Proteins
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Tripartite Motif Proteins
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TRIM62 protein, human
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Ubiquitin-Protein Ligases