HLA-DM and MHC class II molecules co-distribute with peptidase-containing lysosomal subcompartments
نویسندگان
چکیده
منابع مشابه
A role for HLA-DO as a co-chaperone of HLA-DM in peptide loading of MHC class II molecules.
In B cells, the non-classical human leukocyte antigens HLA-DO (DO) and HLA-DM (DM) are residents of lysosome-like organelles where they form tight complexes. DM catalyzes the removal of invariant chain-derived CLIP peptides from classical major histocompatibility complex (MHC) class II molecules, chaperones them until peptides are available for loading, and functions as a peptide editor. Here w...
متن کاملInhibition of HLA-DM Mediated MHC Class II Peptide Loading by HLA-DO Promotes Self Tolerance
Major histocompatibility class II (MHCII) molecules are loaded with peptides derived from foreign and self-proteins within the endosomes and lysosomes of antigen presenting cells (APCs). This process is mediated by interaction of MHCII with the conserved, non-polymorphic MHCII like molecule HLA-DM (DM). DM activity is directly opposed by HLA-DO (DO), another conserved, non-polymorphic MHCII lik...
متن کاملHLA-DO is a negative modulator of HLA-DM-mediated MHC class II peptide loading
BACKGROUND Class II molecules of the major histocompatibility complex become loaded with antigenic peptides after dissociation of invariant chainderived peptides (CLIP) from the peptide-binding groove. The human leukocyte antigen (HLA)-DM is a prerequisite for this process, which takes place in specialised intracellular compartments. HLA-DM catalyses the peptide-exchange process, simultaneously...
متن کاملA lysosomal targeting signal in the cytoplasmic tail of the beta chain directs HLA-DM to MHC class II compartments
In human B cells, class II molecules of the major histocompatibility complex (MHC-II) accumulate in an endosomal/lysosomal compartment, the MIIC, in which they may encounter and bind peptides. An additional molecule required for MHC-II peptide binding, HLA-DM (DM), has also been localized to the MIIC. Neither the relationship of the MIIC to the endosomal system nor the mechanisms by which DM lo...
متن کاملThe MHC class II cofactor HLA-DM interacts with Ig in B cells.
B cells internalize extracellular Ag into endosomes using the Ig component of the BCR. In endosomes, Ag-derived peptides are loaded onto MHC class II proteins. How these pathways intersect remains unclear. We find that HLA-DM (DM), a catalyst for MHC class II peptide loading, coprecipitates with Ig in lysates from human tonsillar B cells and B cell lines. The molecules in the Ig/DM complexes ha...
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ژورنال
عنوان ژورنال: International Immunology
سال: 1996
ISSN: 0953-8178,1460-2377
DOI: 10.1093/intimm/8.5.625