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Related Experiment Video

Updated: Feb 14, 2026

Human In-Vivo Bioassay for the Tissue-Specific Measurement of Nociceptive and Inflammatory Mediators
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Disruption of XIAP-RIP2 Association Blocks NOD2-Mediated Inflammatory Signaling.

Tatiana Goncharov1, Stefanie Hedayati1, Melinda M Mulvihill2

  • 1Department of Early Discovery Biochemistry , Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.

Molecular Cell
|February 18, 2018
PubMed
Summary

Selective XIAP antagonism blocks NOD2 inflammatory signaling by disrupting XIAP-RIP2 binding. RIP2 kinase activity is not essential, but its conformation regulates XIAP interaction, offering therapeutic targets.

Keywords:
IAP antagonistNOD2RIP2RIPK2XIAPinflammatory signalingkinase inhibitorubiquitin

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Area of Science:

  • Immunology
  • Molecular Biology
  • Signal Transduction

Background:

  • NOD2 (Nucleotide-binding oligomerization domain-containing protein 2) is a key pattern recognition receptor involved in innate immunity.
  • NOD2 signaling activates downstream inflammatory pathways, including NF-κB and MAPKs, leading to cytokine production.
  • RIP2 kinase and XIAP (X-linked inhibitor of apoptosis protein) are crucial mediators in NOD2-driven inflammatory responses.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying NOD2-mediated inflammatory signaling.
  • To investigate the role of the XIAP-RIP2 interaction in NOD2 pathway activation.
  • To evaluate the therapeutic potential of targeting XIAP and RIP2 kinase in NOD2 signaling.

Main Methods:

  • Investigated the effects of XIAP antagonism on NOD2 signaling.
  • Assessed the requirement of RIP2 kinase activity for NOD2 pathway activation.
  • Identified XIAP-dependent ubiquitination sites on RIP2 using mutational analysis.
  • Utilized selective XIAP antagonists and RIP2 kinase inhibitors.

Main Results:

  • Selective XIAP antagonism inhibits NOD2-mediated inflammatory signaling and cytokine production by preventing XIAP-RIP2 binding.
  • RIP2 kinase activity is dispensable for NOD2 signaling; RIP2 kinase domain conformation regulates XIAP binding.
  • RIP2 kinase inhibitors effectively block NOD2 signaling by disrupting the RIP2-XIAP interaction.
  • Specific lysine residues on RIP2 are critical for NOD2 signaling and ubiquitination.

Conclusions:

  • The interaction between XIAP and RIP2 is essential for NOD2 inflammatory signaling.
  • RIP2 kinase inhibitors and XIAP antagonists represent promising therapeutic strategies for modulating NOD2-driven inflammation.
  • Understanding the molecular basis of RIP2 ubiquitination provides insights into NOD2 pathway regulation.