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The innate immune protein Nod2 binds directly to MDP, a bacterial cell wall fragment

Catherine Leimkuhler Grimes1, Lushanti De Zoysa Ariyananda, James E Melnyk

  • 1Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA. cgrimes@udel.edu

Journal of the American Chemical Society
|August 4, 2012
PubMed

Insights

Researchers found that Nod2 directly binds to muramyl dipeptide (MDP), a bacterial cell wall fragment. This discovery offers new insights into innate immunity and diseases like Crohn's disease.

Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Mammalian Nod2 is an intracellular protein crucial for innate immunity against bacterial components.
  • Nod2 is linked to Crohn's disease, Blau syndrome, and gastrointestinal cancers.
  • Nod2 mediates immune responses to muramyl dipeptide (MDP), but direct binding was unconfirmed.

Purpose of the Study:

  • To investigate the direct interaction between Nod2 and MDP.
  • To provide biochemical evidence for Nod2-MDP binding.

Main Methods:

  • Expression and purification of human Nod2 from insect cells.
  • Utilizing novel MDP self-assembled monolayers (SAMs) for binding assays.

Main Results:

  • Successful expression and purification of functional human Nod2.
  • Demonstrated direct, high-affinity binding between Nod2 and MDP using SAMs.

Conclusions:

  • The study provides the first biochemical evidence for a direct interaction between Nod2 and MDP.
  • This finding enhances understanding of Nod2's role in innate immunity and associated diseases.

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