Human HLA-DRB1 Recombinant Protein (RPPB5892)
- SKU:
- RPPB5892
- Product Type:
- Recombinant Protein
- Species:
- Human
- Uniprot:
- Q29974
Description
| Product Name: | Human HLA-DRB1 Recombinant Protein |
| Product Code: | RPPB5892 |
| Size: | 5µg |
| Species: | Human |
| Target: | HLA-DRB1 |
| Synonyms: | DRB1, HLA DRB1, HLA-DR1B, HLA-DRB1, MHC class II antigen DRB1 16, DR-16, DR16, Human Leucocyte Antigen DRB1, MHC Class II HLA-DR-Beta Cell Surface Glycoprotein, MHC Class II HLA-DRw10-Beta. |
| Source: | Sf9 Insect cells |
| Physical Appearance: | Sterile Filtered colorless solution. |
| Formulation: | HLA-DRB1 protein solution (0.25mg/ml) contains Phosphate Buffered Saline (pH 7.4) and 30% glycerol. |
| Stability: | Store at 4°C if entire vial will be used within 2-4 weeks. Store, frozen at -20°C for longer periods of time.�For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA).�Avoid multiple freeze-thaw cycles. |
| Purity: | Greater than 85.0% as determined by SDS-PAGE. |
| Amino Acid Sequence: | ADPGDTRPRF LWQPKRECHF FNGTERVRFL DRYFYNQEES VRFDSDVGEF RAVTELGRPD AEYWNSQKDI LEQARAAVDT YCRHNYGVVE SFTVQRRVQP KVTVYPSKTQ PLQHHNLLVC SVSGFYPGSI EVRWFLNGQE EKAGMVSTGL IQNGDWTFQT LVMLETVPRS GEVYTCQVEH PSVTSPLTVE WRARSESAQS KHHHHHH |
Major Histocompatibility Complex Class II DR Beta 1 also known as HLA-DRB1 ia a member of the HLA class II beta chain paralogs. Molecule class II is a heterodimer consisting of an alpha (DRA) and a beta chain (DRB), both anchored in the membrane. HLA-DRB1 takes an essential part in the immune system by presenting peptides derived from extracellular proteins. Class II molecules are expressed in antigen presenting cells (APC: B lymphocytes, dendritic cells, macrophages). Furthermore, the beta chain is approximately 26- 28 kDa. It is encoded by 6 exons. While exon one encodes the leader peptide; exons 2 and 3 encode the two extracellular domains; exon 4 encodes the transmembrane domain; and exon 5 encodes the cytoplasmic tail.
HLA-DRB1 produced in Sf9 Baculovirus cells is a single, glycosylated polypeptide chain containing 207 amino acids (30-227a.a.) and having a molecular mass of 24.0kDa. (Molecular size on SDS-PAGE will appear at approximately 28-40kDa). HLA-DRB1 is expressed with a 9 amino acid His tag at C-Terminus and purified by proprietary chromatographic techniques.
| UniProt Protein 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. |
| NCBI Summary: | HLA-DRB1 belongs to the HLA class II beta chain paralogs. The class II molecule is a heterodimer consisting of an alpha (DRA) and a beta chain (DRB), both anchored in the membrane. It plays a central role in the immune system by presenting peptides derived from extracellular proteins. Class II molecules are expressed in antigen presenting cells (APC: B lymphocytes, dendritic cells, macrophages). The beta chain is approximately 26-28 kDa. It is encoded by 6 exons. Exon one encodes the leader peptide; exons 2 and 3 encode the two extracellular domains; exon 4 encodes the transmembrane domain; and exon 5 encodes the cytoplasmic tail. Within the DR molecule the beta chain contains all the polymorphisms specifying the peptide binding specificities. Hundreds of DRB1 alleles have been described and typing for these polymorphisms is routinely done for bone marrow and kidney transplantation. DRB1 is expressed at a level five times higher than its paralogs DRB3, DRB4 and DRB5. DRB1 is present in all individuals. Allelic variants of DRB1 are linked with either none or one of the genes DRB3, DRB4 and DRB5. There are 4 related pseudogenes: DRB2, DRB6, DRB7, DRB8 and DRB9. [provided by RefSeq, Jul 2008] |
| UniProt Code: | Q29974 |
| NCBI GenInfo Identifier: | 74762149 |
| NCBI Gene ID: | 3123 |
| NCBI Accession: | Q29974.1 |
| UniProt Related Accession: | P01911,P01912,P04229,P20039,Q29974,Q30134,Q30167,Q5Y7A7,Q95IE3,Q9GIY3 |
| Molecular Weight: | 24.0kDa (207aa); 28-40kDa (SDS-PAGE under reducing conditions) |
| NCBI Full Name: | HLA class II histocompatibility antigen, DRB1-16 beta chain |
| NCBI Synonym Full Names: | major histocompatibility complex, class II, DR beta 1 |
| NCBI Official Symbol: | HLA-DRB1�� |
| NCBI Official Synonym Symbols: | SS1; DRB1; HLA-DRB; HLA-DR1B�� |
| NCBI Protein Information: | major histocompatibility complex, class II, DR beta 1 |
| UniProt Protein Name: | HLA class II histocompatibility antigen, DRB1-16 beta chain |
| UniProt Synonym Protein Names: | MHC class II antigen DRB1*16; DR-16; DR16 |
| Protein Family: | HLA class II histocompatibility antigen |
| UniProt Gene Name: | HLA-DRB1�� |
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