Peptidoglycan molecular requirements allowing detection by Nod1 and Nod2 - PubMed (original) (raw)
. 2003 Oct 24;278(43):41702-8.
doi: 10.1074/jbc.M307198200. Epub 2003 Jul 18.
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- PMID: 12871942
- DOI: 10.1074/jbc.M307198200
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Peptidoglycan molecular requirements allowing detection by Nod1 and Nod2
Stephen E Girardin et al. J Biol Chem. 2003.
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Abstract
Nod1 and Nod2 are mammalian proteins implicated in the intracellular detection of pathogen-associated molecular patterns. Recently, naturally occurring peptidoglycan (PG) fragments were identified as the microbial motifs sensed by Nod1 and Nod2. Whereas Nod2 detects GlcNAc-MurNAc dipeptide (GM-Di), Nod1 senses a unique diaminopimelate-containing GlcNAc-MurNAc tripeptide muropeptide (GM-TriDAP) found mostly in Gram-negative bacterial PGs. Because Nod1 and Nod2 detect similar yet distinct muropeptides, we further analyzed the molecular sensing specificity of Nod1 and Nod2 toward PG fragments. Using a wide array of natural or modified muramyl peptides, we show here that Nod1 and Nod2 have evolved divergent strategies to achieve PG sensing. By defining the PG structural requirements for Nod1 and Nod2 sensing, this study reveals how PG processing and modifications, either by host or bacterial enzymes, may affect innate immune responses.
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