| Host: |
Rabbit |
| Applications: |
WB |
| Reactivity: |
Human/Mouse |
| Note: |
STRICTLY FOR FURTHER SCIENTIFIC RESEARCH USE ONLY (RUO). MUST NOT TO BE USED IN DIAGNOSTIC OR THERAPEUTIC APPLICATIONS. |
| Short Description: |
Rabbit polyclonal antibody anti-HLA-DRB4 (30-227) is suitable for use in Western Blot research applications. |
| Clonality: |
Polyclonal |
| Conjugation: |
Unconjugated |
| Isotype: |
IgG |
| Formulation: |
PBS with 0.02% Sodium Azide, 50% Glycerol, pH7.3. |
| Purification: |
Affinity purification |
| Dilution Range: |
WB 1:1000-1:4000 |
| Storage Instruction: |
Store at-20°C for up to 1 year from the date of receipt, and avoid repeat freeze-thaw cycles. |
| Gene Symbol: |
HLA-DRB4 |
| Gene ID: |
3126 |
| Uniprot ID: |
DRB4_HUMAN |
| Immunogen Region: |
30-227 |
| Immunogen: |
Recombinant fusion protein containing a sequence corresponding to amino acids 30-227 of human HLA-DRB4 (NP_068818.4). |
| Immunogen Sequence: |
GDTQPRFLEQAKCECHFLNG TERVWNLIRYIYNQEEYARY NSDLGEYQAVTELGRPDAEY WNSQKDLLERRRAEVDTYCR YNYGVVESFTVQRRVQPKVT VYPSKTQPLQHHNLLVCSVN GFYPGSIEVRWFRNGQEEKA GVVSTGLIQNGDWTFQTLVM LETVPRSGEVYTCQVEHPSM MSPLTVQWSARSESAQSK |
| Post Translational Modifications | Ubiquitinated by MARCH1 and MARCH8 at Lys-254 leading to sorting into the endosome system and down-regulation of MHC class II. When associated with ubiquitination of the alpha subunit of HLA-DR: HLA-DRA 'Lys-244', the down-regulation of MHC class II may be highly effective. |
| Function | 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 molecules 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 molecules, 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 molecules and CD74 and act as APCs, which is an unusual trait of the GI tract. To produce a MHC class II molecule that presents an antigen, three MHC class II molecules (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 molecules until primary high affinity antigenic peptides are bound. The MHC II molecule bound to a peptide is then transported to the cell membrane surface. In B-cells, the interaction between HLA-DM and MHC class II molecules is regulated by HLA-DO. Primary dendritic cells (DCs) also to express HLA-DO. Lysosomal microenvironment has been implicated in the regulation of antigen loading into MHC II molecules, increased acidification produces increased proteolysis and efficient peptide loading. |
| Protein Name | Hla Class Ii Histocompatibility Antigen - Dr Beta 4 ChainMhc Class Ii Antigen Drb4 |
| Database Links | Reactome: R-HSA-202424Reactome: R-HSA-202427Reactome: R-HSA-202430Reactome: R-HSA-202433Reactome: R-HSA-2132295Reactome: R-HSA-389948Reactome: R-HSA-877300 |
| Cellular Localisation | Cell MembraneSingle-Pass Type I Membrane ProteinEndoplasmic Reticulum MembraneGolgi ApparatusTrans-Golgi Network MembraneEndosome MembraneLysosome MembraneLate Endosome MembraneThe Mhc Class Ii Complex Transits Through A Number Of Intracellular Compartments In The Endocytic Pathway Until It Reaches The Cell Membrane For Antigen Presentation |
| Alternative Antibody Names | Anti-Hla Class Ii Histocompatibility Antigen - Dr Beta 4 Chain antibodyAnti-Mhc Class Ii Antigen Drb4 antibodyAnti-HLA-DRB4 antibody |
Information sourced from Uniprot.org
12 months for antibodies. 6 months for ELISA Kits. Please see website T&Cs for further guidance
