6xng

MHC-like protein complex structure

spinqualitylabelsall models 6xng, resolution 2.79Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6xng is a 4 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.79Å Ligands: BMA, NAG, V8P Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CD1D1_MOUSE Antigen-presenting protein that binds self and non-self glycolipids and presents them to T-cell receptors on natural killer T-cells. Publication Abstract from PubMed Small molecules derived from symbiotic microbiota critically contribute to intestinal immune maturation and regulation(1). However, little is known about the molecular mechanisms that control immune development in the host-microbiota environment. Here, using a targeted lipidomic analysis and synthetic approach, we carried out a multifaceted investigation of immunomodulatory alpha-galactosylceramides from the human symbiont Bacteroides fragilis (BfaGCs). The characteristic terminal branching of BfaGCs is the result of incorporation of branched-chain amino acids taken up in the host gut by B. fragilis. A B. fragilis knockout strain that cannot metabolize branched-chain amino acids showed reduced branching in BfaGCs, and mice monocolonized with this mutant strain had impaired colonic natural killer T (NKT) cell regulation, implying structure-specific immunomodulatory activity. The sphinganine chain branching of BfaGCs is a critical determinant of NKT cell activation, which induces specific immunomodulatory gene expression signatures and effector functions. Co-crystal structure and affinity analyses of CD1d-BfaGC-NKT cell receptor complexes confirmed the interaction of BfaGCs as CD1d-restricted ligands. We present a structural and molecular-level paradigm of immunomodulatory control by interactions of endobiotic metabolites with diet, microbiota and the immune system. Host immunomodulatory lipids created by symbionts from dietary amino acids.,Oh SF, Praveena T, Song H, Yoo JS, Jung DJ, Erturk-Hasdemir D, Hwang YS, Lee CC, Le Nours J, Kim H, Lee J, Blumberg RS, Rossjohn J, Park SB, Kasper DL Nature. 2021 Dec;600(7888):302-307. doi: 10.1038/s41586-021-04083-0. Epub 2021 , Nov 10. PMID:34759313 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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