Nucleotide-binding oligomerization domain-containing protein 2 (NOD2), also known as caspase recruitment domain-containing protein 15 (CARD15) or inflammatory bowel disease protein 1 (IBD1), is a protein that in humans is encoded by the NOD2gene located on chromosome 16.[5][6] NOD2 plays an important role in the immune system. It recognizes bacterial molecules (peptidoglycans) and stimulates an immune reaction.[7]
NOD2 protein model consisting two N-terminal CARD domains (red) connected via helical linker (blue) with central NOD domain (green). At C-terminus LRR domain (cyan) is located[9]
The C-terminal portion of the protein contains a leucine-rich repeat domain that is known to play a role in protein–protein interactions. The middle part of the protein is characterized by a NOD domain involved in protein self-oligomerization. The N-terminal portion contains two CARD domains known to play a role in apoptosis and NF-κB activation pathways.[10]
NOD2 has also been shown to bind to MAVS in response to ssRNA or viral RNA treatment and activate the IFN response. This is the first report of NOD2 acting as a pattern-recognition receptor for viruses.[18]
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Girardin SE, Hugot JP, Sansonetti PJ (Dec 2003). "Lessons from Nod2 studies: towards a link between Crohn's disease and bacterial sensing". Trends in Immunology. 24 (12): 652–8. doi:10.1016/j.it.2003.10.007. PMID14644139.
Newman B, Siminovitch K (Dec 2003). "Inflammatory bowel disease: Crohn's disease and the success of NODern genetics". Clinical and Investigative Medicine. 26 (6): 303–14. PMID14690304.
Oostenbrug LE, van Dullemen HM, te Meerman GJ, Jansen PL (2003). "IBD and genetics: new developments". Scandinavian Journal of Gastroenterology. Supplement. 38 (239): 63–8. doi:10.1080/00855920310002717 (inactive 1 November 2024). PMID14743885.{{cite journal}}: CS1 maint: DOI inactive as of November 2024 (link)
Kambe N, Nishikomori R, Kanazawa N (Aug 2005). "The cytosolic pattern-recognition receptor Nod2 and inflammatory granulomatous disorders". Journal of Dermatological Science. 39 (2): 71–80. doi:10.1016/j.jdermsci.2005.04.001. PMID15927452.
Newman B, Siminovitch KA (Jul 2005). "Recent advances in the genetics of inflammatory bowel disease". Current Opinion in Gastroenterology. 21 (4): 401–7. PMID15930978.
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