Volume : 50 µg
Clone Number :
Aliases : DR 4 antibody; DR beta 4 chain antibody; DR4 antibody; DRB1 transplantation antigen antibody; DRB4 antibody; DRB4_HUMAN antibody; HLA class II histocompatibility antigen antibody; HLA class II histocompatibility antigen DR beta 4 chain antibody; HLA-DRB4 antibody; Human leucocyte antigen DRB4 antibody; Leukocyte antigen antibody; Major histocompatibility complex class II DR beta 4 antibody; MHC class II antigen DRB4 antibody; MHC class II antigen HLA DR beta antibody; MHC class2 antigen antibody; MHC HLA DR-beta chain antibody
Product Type : polyclonal Ab Antibody
Immunogen Species : Homo sapiens (Human)
UniProt ID : P13762
Immunogen : Recombinant Human HLA class II histocompatibility antigen, DR beta 4 chain protein (30-227AA)
Raised in : Rabbit
Species Reactivity : Human
Tested Applications :
Background : Binds peptides derived from antigens that access the endocytic route of antigen presenting cells (APC) and presents them on the cell surface for recognition by the CD4 T-cells. The peptide binding cleft accommodates peptides of 10-30 residues. The peptides presented by MHC class II molec µLes are generated mostly by degradation of proteins that access the endocytic route, where they are processed by lysosomal proteases and other hydrolases. Exogenous antigens that have been endocytosed by the APC are thus readily available for presentation via MHC II molec µLes, and for this reason this antigen presentation pathway is usually referred to as exogenous. As membrane proteins on their way to degradation in lysosomes as part of their normal turn-over are also contained in the endosomal/lysosomal compartments, exogenous antigens must compete with those derived from endogenous components. Autophagy is also a source of endogenous peptides, autophagosomes constitutively fuse with MHC class II loading compartments. In addition to APCs, other cells of the gastrointestinal tract, such as epithelial cells, express MHC class II molec µLes and CD74 and act as APCs, which is an unusual trait of the GI tract. To produce a MHC class II molec µLe that presents an antigen, three MHC class II molec µLes (heterodimers of an alpha and a beta chain) associate with a CD74 trimer in the ER to form a heterononamer. Soon after the entry of this complex into the endosomal/lysosomal system where antigen processing occurs, CD74 undergoes a sequential degradation by various proteases, including CTSS and CTSL, leaving a small fragment termed CLIP (class-II-associated invariant chain peptide). The removal of CLIP is facilitated by HLA-DM via direct binding to the alpha-beta-CLIP complex so that CLIP is released. HLA-DM stabilizes MHC class II molec µLes until primary high affinity antigenic peptides are bound. The MHC II molec µLe bound to a peptide is then transported to the cell membrane surface. In B-cells, the interaction between HLA-DM and MHC class II molec µLes is reg µLated by HLA-DO. Primary dendritic cells (DCs) also to express HLA-DO. Lysosomal microenvironment has been implicated in the reg µLation of antigen loading into MHC II molec µLes, increased acidification produces increased proteolysis and efficient peptide loading.
Clonality : polyclonal Ab
Isotype : IgG
Purification Method : >95%, Protein G purified
Conj µgate : FITC
Buffer : Preservative : 0.03% Proclin 300
Constituents : 50% Glycerol, 0.01M PBS, PH 7.4
Form : Liquid
Stroage : Upon receipt, store at -20°C or -80°C. Avoid repeated freeze.
Target Names : HLA-DRB4
Research Areas : Immunology
