Ubiquitin Ligase TRIM62 Regulates CARD9-Mediated Anti-fungal Immunity and Intestinal Inflammation

Immunity. 2015 Oct 20;43(4):715-26. doi: 10.1016/j.immuni.2015.10.005.

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.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adjuvants, Immunologic / pharmacology
  • Animals
  • CARD Signaling Adaptor Proteins / chemistry
  • CARD Signaling Adaptor Proteins / deficiency
  • CARD Signaling Adaptor Proteins / genetics
  • CARD Signaling Adaptor Proteins / physiology*
  • Candidiasis, Invasive / genetics
  • Candidiasis, Invasive / immunology*
  • Colitis / chemically induced
  • Colitis / genetics
  • Colitis / prevention & control
  • Cytokines / biosynthesis
  • Dendritic Cells / immunology
  • Dendritic Cells / metabolism
  • Genes, Dominant
  • Genetic Predisposition to Disease
  • HEK293 Cells
  • HeLa Cells
  • Humans
  • Inflammatory Bowel Diseases / genetics
  • Mice
  • Mice, 129 Strain
  • Mice, Knockout
  • Protein Interaction Mapping
  • Protein Isoforms / chemistry
  • Protein Isoforms / genetics
  • Protein Isoforms / physiology
  • Protein Processing, Post-Translational
  • Protein Structure, Tertiary
  • Receptors, Angiotensin / chemistry
  • Receptors, Angiotensin / deficiency
  • Receptors, Angiotensin / physiology*
  • Receptors, Endothelin / chemistry
  • Receptors, Endothelin / deficiency
  • Receptors, Endothelin / physiology*
  • Recombinant Fusion Proteins / metabolism
  • Signal Transduction
  • Specific Pathogen-Free Organisms
  • Tripartite Motif Proteins
  • Ubiquitin-Protein Ligases / chemistry
  • Ubiquitin-Protein Ligases / physiology*
  • Ubiquitination

Substances

  • Adjuvants, Immunologic
  • CARD Signaling Adaptor Proteins
  • CARD9 protein, human
  • Card9 protein, mouse
  • Cytokines
  • Dear1 protein, mouse
  • Protein Isoforms
  • Receptors, Angiotensin
  • Receptors, Endothelin
  • Recombinant Fusion Proteins
  • Tripartite Motif Proteins
  • TRIM62 protein, human
  • Ubiquitin-Protein Ligases