Mouse HLA-DRB Monoclonal Antibody | anti-HLA-DRB1 antibody

HLA-DRB (MHC II) Mouse Monoclonal Antibody

Cat. Num. AAA439174

• Gene Names: HLA-DRB1; SS1; DRB1; DRw10; HLA-DRB; HLA-DR1B
• Reactivity: Human, Monkey.; Does not react with Mouse
• Applications: Flow Cytometry, Functional Assay, Immunofluorescence, Western Blot, Immunohistochemistry
• Synonyms: HLA-DRB; Monoclonal Antibody; HLA-DRB (MHC II) Mouse Monoclonal Antibody; DRB1; HLA class II histocompatibility antigen; DR-1 beta chain; HLA-DR-beta 1; HLA-DRB1; human leucocyte antigen DRB1; Leucocyte antigen DR beta 1 chain; lymphocyte antigen DRB1; major histocompatibility complex; class II; DR beta 1; MHC class II HLA-DR beta 1 chain; MHC class II HLA-DR-beta cell surface glycoprotein; anti-HLA-DRB1 antibody

• Host: Mouse
• Reactivity: Human, Monkey.; Does not react with Mouse
• Clonality: Monoclonal
• Isotype: IgG2b, kappa
• Clone Number: SPM423
• Specificity: This MAb reacts with a 28kDa chain of HLA-DRB1 antigen, a member of MHC class II molecules. It does not cross react with HLA-DP and HLA-DQ. The L243 antibody recognizes a different epitope than the LN3 monoclonal antibody, and these antibodies do not cross-block binding to each other's respective epitopes. HLA-DR is a heterodimeric cell surface glycoprotein comprised of a 36kDa alpha (heavy) chain and a 28kDa beta (light) chain. It is expressed on B-cells, activated T-cells, monocytes/macrophages, dendritic cells and other non-professional AP's. In conjunction with the CD3/TCR complex and CD4 molecules, HLA-DR is critical for efficient peptide presentation to CD4+ T cells. It is an excellent histiocytic marker in paraffin sections producing intense staining. True histiocytic neoplasms are similarly positive. HLA-DR antigens also occur on a variety of epithelial cells and their corresponding neoplastic counterparts. Loss of HLA-DR expression is related to tumor microenvironment and predicts adverse outcome in diffuse large B-cell lymphoma.
• Form/Format: 200ug/ml of Ab purified from Bioreactor Concentrate by Protein A/G. Prepared in 10mM PBS with 0.05% BSA & 0.05% azide. Also available WITHOUT BSA & azide at 1.0mg/ml.
• Sequence Length: 266

• Applicable Applications for anti-HLA-DRB1 antibody: Flow Cytometry (FC/FACS), Immunofluorescence (IF), Western Blot (WB), Immunohistochemistry (IHC) Formalin
• Application Notes: Flow Cytometry (0.5-1ug/million cells in 0.1ml); Immunofluorescence (0.5-1ug/ml); Western Blot (0.5-1ug/ml); Immunohistochemistry (Formalin-fixed) (0.25-0.5ug/ml for 30 minutes at RT) (Staining of formalin-fixed tissues is enhanced by boiling tissue sections in 10mM Citrate Buffer, pH 6.0, for 10-20 min followed by cooling at RT for 20 minutes)
• Cellular Localization: Cell Surface
• Immunogen: Activated human peripheral blood mononuclear cells
• Hu-Chromosome Location: 6p21.3
• Positive Control: Ramos, Daudi or HuT78 cells. Tonsil or lymph node
• Preparation and Storage: Antibody with azide - store at 2 to 8 degree C. Antibody without azide - store at -20 to -80 degree C. Antibody is stable for 24 months. Non-hazardous. No MSDS required.

Immunohistochemistry (IHC)

(Formalin-fixed, paraffin-embedded human Histiocytoma stained with HLA-DRB Monoclonal Antibody (SPM423).)

References

Marder RJ, et al. 1985. Lab. Invest. 52:497.2. Norton AJ and Isaacson PG. 1987. Am. J. Pathol. 128:225.3. Hua ZX, et al. 1998. Hum. Pathol. 29(12):1441

NCBI and Uniprot Product Information

• NCBI GI #: 155030211
• NCBI GeneID: 3123
• NCBI Accession #: NP_002115.2
• NCBI GenBank Nucleotide #: NM_002124.3
• UniProt Accession #: P01911; Q29790; Q29975; Q30142; Q30166; Q32MY7; Q56FN9; Q5Y7B0; Q5Y7B9; P20039; Q5Y7A7; Q95IE3; Q9GIY3; Q29974; P01912; Q30134; P04229; Q30167
• Molecular Weight: 28kDa (beta chain)
• NCBI Official Full Name: major histocompatibility complex, class II, DR beta 1
• NCBI Official Synonym Full Names: major histocompatibility complex, class II, DR beta 1
• NCBI Official Symbol: HLA-DRB1
• NCBI Official Synonym Symbols: SS1; DRB1; DRw10; HLA-DRB; HLA-DR1B
• NCBI Protein Information: major histocompatibility complex, class II, DR beta 1
• UniProt Protein Name: HLA class II histocompatibility antigen, DRB1-15 beta chain
• Protein Family: HLA class II histocompatibility antigen
• UniProt Gene Name: HLA-DRB1
• UniProt Synonym Gene Names: HLA-DRB2
• UniProt Entry Name: 2B1F_HUMAN

NCBI Description

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 Description

HLA-DRB1 iso2: 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 miroenvironment has been implicated in the regulation of antigen loading into MHC II molecules; increased acidification produces increased proteolysis and efficient peptide loading. Genetic variation in HLA-DRB1 is a cause of susceptibility to sarcoidosis type 1 (SS1). Sarcoidosis is an idiopathic, systemic, inflammatory disease characterized by the formation of immune granulomas in involved organs. Granulomas predominantly invade the lungs and the lymphatic system, but also skin, liver, spleen, eyes and other organs may be involved. Belongs to the MHC class II family.

Protein type: Membrane protein, integral

Chromosomal Location of Human Ortholog: 6p21.3

Cellular Component: cell surface; Golgi membrane; late endosome membrane; lysosomal membrane; membrane; MHC class II protein complex; plasma membrane; trans-Golgi network membrane

Molecular Function: peptide antigen binding

Biological Process: antigen processing and presentation of exogenous peptide antigen via MHC class II; polysaccharide assembly with MHC class II protein complex; T cell costimulation; T cell receptor signaling pathway