Major histocompatibility complex

spinqualitylabelsall models Human MHC class I antigen (cyan) withβ 2-microglobulin (green) and peptide from Hepatitis virus (deeppink) 3ox8 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Function Major Histocompatibility Complex (MHC) molecules bind peptides derived from degraded proteins and present these peptides on the surface of the cell. T-cells or natural killer receptors recognize the MHC:peptide complex and trigger an immune response if the presented peptide (“antigen”) is suggestive of a pathogenic or foreign protein. Thus, MHC molecules allow for immune system detection of intracellular activity, making them an essential part of the organism’s immune system. MHC class I (Major Histocompatibility Complex Class I) are found in all nucleated cells. These cell surface proteins display peptides from cellular intrinsic proteins. For more details see Effect of HCMV on Major Histocompatibility Complex Class I MR1 Binds Vitamin Metabolites. MHC class II are found in professional antigen-presenting cells like macrophages. These cell surface proteins display peptides from cellular extrinsic proteins. For MHC class II interactions with T-cell receptor and gliadin peptide see SP3.4-TCR-HLA-DQ8-α-1-gliadin complex. Structural highlights Human MHC class I antigen with β 2-microglobulin and peptide from Hepatitis virus. The peptide derived from Hepatitis virus binds MHC in a peptide-recognition groove and makes various interactions with side chains and with water molecules. Water molecules shown as red spheres. 3D structures of MHC MHC 3D structures of MHC

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Tihitina Y Aytenfisu, Michal Harel, Eric Martz, Alexander Berchansky, Sandra B. Gabelli, Joel L. Sussman