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N4BP1 functions as a dimerization-dependent linear ubiquitin reader which regulates TNF signalling.

Katarzyna W Kliza1,2, Wei Song3,4, Irene Pinzuti3

  • 1Institute of Biochemistry II, Goethe University School of Medicine, Frankfurt (Main), Germany. katarzyna.kliza@mpi-dortmund.mpg.de.

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|April 20, 2024
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Summary
This summary is machine-generated.

NEDD4-binding protein 1 (N4BP1) acts as a novel linear ubiquitin reader, regulating inflammation and cell death. Its unique dimerization-dependent module (LUBIN) controls Tumor Necrosis Factor Receptor 1 (TNFR1) signaling duration.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Tumor Necrosis Factor Receptor 1 (TNFR1) signaling is crucial for inflammation and cell death, with dysregulation linked to autoimmune diseases and cancer.
  • NEDD4-binding protein 1 (N4BP1) is known to suppress inflammation, but its precise molecular mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the molecular properties enabling N4BP1 to suppress inflammation.
  • To investigate N4BP1's role in regulating TNFR1 signaling pathways.

Main Methods:

  • Biochemical assays to characterize N4BP1's ubiquitin-binding capabilities.
  • Cell-based assays to assess N4BP1's function in TNFR1 signaling, NFκB activation, and apoptosis.
  • Analysis of N4BP1's interaction with signaling complexes under inflammatory and apoptotic conditions.

Main Results:

  • N4BP1 functions as a novel linear ubiquitin reader through its unique dimerization-dependent ubiquitin-binding module, termed LUBIN.
  • Dimeric N4BP1 preferentially recognizes linear ubiquitin, negatively regulating NFκB signaling.
  • N4BP1 is recruited to the TNFR1 signaling complex, modulating inflammatory signaling duration and influencing TNFα-induced cell death.
  • Proteolytic processing of N4BP1 by caspase-8 under apoptotic conditions accelerates apoptosis.

Conclusions:

  • N4BP1 dimerization creates a unique linear ubiquitin reader (LUBIN) essential for regulating TNFR1-mediated inflammation and cell death.
  • N4BP1 plays a critical role in the timely and coordinated control of inflammatory responses and programmed cell death.