Heat shock protein 90 associates with monarch-1 and regulates its ability to promote degradation of NF-kappaB-inducing kinase.

Monarch-1/NLRP12 is expressed in myeloid cells and functions as a negative regulator of inflammation by inducing proteasome-mediated degradation of NF-kappaB-inducing kinase. Monarch-1 is a member of the CATERPILLER gene family, also known as the nucleotide-binding domain leucine-rich repeat gene family. This family shares strong structural homology to major immune regulators ...
expressed in lower organisms, including plants. In plants, these disease-resistance proteins (R proteins) sense pathogenic insult and initiate a protective response to limit pathogen growth. To perform this role, many R proteins require the highly conserved chaperone molecule, heat shock protein (Hsp) 90. Using a two-dimensional gel/mass spectrometry system, we detected the association of the nucleotide-binding domain leucine-rich repeat protein Monarch-1 with heat shock proteins. Further analysis indicates that analogous to plant R proteins, Hsp90 is required for Monarch-1 activity. In human monocytes, Monarch-1 associates with Hsp90, and these complexes are sensitive to treatment with specific Hsp90 inhibitors. Disruption of these complexes results in rapid degradation of Monarch-1 via the proteasome and prevents Monarch-1-induced proteolysis of NF-kappaB-inducing kinase. This demonstrates that Hsp90 is a critical regulator of Monarch-1 anti-inflammatory activity.
Mesh Terms:
Cells, Cultured, HSP70 Heat-Shock Proteins, HSP90 Heat-Shock Proteins, Humans, Intracellular Signaling Peptides and Proteins, Monocytes, Proteasome Endopeptidase Complex, Protein Binding, Protein-Serine-Threonine Kinases, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
J. Immunol.
Date: Nov. 01, 2007
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