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Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
07:09

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Published on: January 7, 2019

Multiple protein domains mediate interaction between Bcl10 and MALT1.

Felicia D Langel1, Nidhi A Jain, Jeremy S Rossman

  • 1Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814, USA.

The Journal of Biological Chemistry
|September 23, 2008
PubMed
Summary

The Bcl10-MALT1 interaction is crucial for NF-kappaB signaling and MALT lymphoma. This study reveals that multiple protein domains, including the Bcl10 caspase recruitment domain (CARD) and MALT1 death domain, mediate this complex association.

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Immunology

Background:

  • Bcl10 and MALT1 are key mediators of NF-kappaB activation, triggered by various receptors.
  • Both proteins are implicated in MALT lymphoma, highlighting the importance of their interaction.
  • Previous research identified a 13-amino acid region in Bcl10 interacting with MALT1's immunoglobulin-like domains.

Purpose of the Study:

  • To elucidate the detailed molecular mechanisms governing the Bcl10-MALT1 interaction.
  • To investigate the roles of the Bcl10 CARD and MALT1 death domain in mediating this association.
  • To identify specific residues involved in the Bcl10-MALT1 complex formation.

Main Methods:

  • Co-immunoprecipitation assays to detect protein interactions.
  • Förster Resonance Energy Transfer (FRET) to study in vivo interactions in T cells.
  • Site-directed mutagenesis of Bcl10 to analyze the function of specific residues and domains.
  • Molecular modeling to predict protein complex structures.

Main Results:

  • Evidence suggests that the MALT1 death domain, in addition to the previously known Bcl10 region, contributes to Bcl10-MALT1 interactions.
  • FRET data indicate a significant role for the MALT1 death domain in Bcl10-MALT1 association within T cells.
  • The Bcl10 CARD is essential for interaction with the MALT1 N terminus; mutations impairing CARD folding disrupt this interaction.
  • Specific residues (Asp80 and Glu84) in Bcl10's helix 5 are predicted to directly contact MALT1.

Conclusions:

  • The Bcl10-MALT1 association is a complex interaction involving multiple protein domains, not just the previously identified regions.
  • This interaction is critical for NF-kappaB pathway activation and is relevant to MALT lymphoma pathogenesis.
  • The Bcl10-MALT1 interaction represents a novel example of a CARD domain interacting with a non-CARD protein region, suggesting broader implications for signaling pathways.