Description: The L243 mAb reacts with the human major histocompatibility complex (MHC) class II, HLA-DR. HLA-DR is expressed on the surface of human antigen presenting cells (APC) including B cells, monocytes, macrophages, DCs, and activated T cells. HLA-DR is a heterodimeric transmembrane protein composed of alpha and beta subunits and plays an important role in the presentation of peptides to CD4^+ T lymphocytes. 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.
Applications Reported: This L243 antibody has been reported for use in flow cytometric analysis.
Applications Tested: This L243 antibody has been pre-diluted and tested by flow cytometric analysis of normal human peripheral blood cells. This may be used at 5 µL (0.25 µg) per test. A test is defined as the amount (µg) of antibody that will stain a cell sample in a final volume of 100 µL. Cell number should be determined empirically but can range from 10^5 to 10^8 cells/test.
APC-eFluor 780 emits at 780 nm and is excited with the Red laser (633-647 nm). Please make sure that your instrument is capable of detecting this fluorochrome.
Light sensitivity: This tandem dye is sensitive to photo-induced oxidation. Please protect this vial and stained samples from light.
Fixation: Samples can be stored in IC Fixation Buffer (Product # 00-8222-49) (100 µL of cell sample + 100 µL of IC Fixation Buffer) or 1-step Fix/Lyse Solution (Product # 00-5333-57) for up to 3 days in the dark at 4°C with minimal impact on brightness and FRET efficiency/compensation. Some generalizations regarding fluorophore performance after fixation can be made, but clone specific performance should be determined empirically.
Excitation: 633-647 nm; Emission: 780 nm; Laser: Red Laser
HLA-DR, like other MHC class II molecules, is a transmembrane glycoprotein composed of a 36 kDa alpha chain (DRA) and 27 kDa beta chain (DRB). The alpha chain gene contains 5 exons. Exon 1 encodes the leader peptide, exons 2 and 3 encode the two extracellular domains, and exon 4 encodes the transmembrane domain and the cytoplasmic tail. DRA does not have polymorphisms in the peptide binding part and acts as the sole alpha chain for DRB1, DRB3, DRB4 and DRB5. 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. HLA-DR is expressed primarily on antigen presenting cells such as B lymphocytes, monocytes, macrophages, thymic epithelial cells and activated T lymphocytes. Three loci, DR, DQ and DP, encode the major expressed products of the human class II region. The human MHC class II molecules bind intracellularly processed peptides, present them to T-helper cells, and have a critical role in the initiation of the immune response.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
Protein Aliases: CD74; CD74 antigen; CD74 antigen (invariant polypeptide of major histocompatibility complex, class II antigen-associated); CD74 molecule, major histocompatibility complex, class II invariant chain; Clone P2-beta-3; DASS-397D15.1; DLA class II histocompatibility antigen, DR-1 beta chain; DLA DRBB1 beta chain; DLA-DR beta; DR beta-5; DR-16; DR-9; DR2-beta-2; DR7; DR9; DRB1 transplantation antigen; Dw2; DW2.2/DR2.2; FLJ51114; FLJ75017; FLJ76359; gamma chain of class II antigens; histocompatibility antigen HLA-DR alpha; HLA class II histocompatibility antigen gamma chain; HLA class II histocompatibility antigen, DR alpha chain; HLA class II histocompatibility antigen, DR beta 3 chain; HLA class II histocompatibility antigen, DR beta 4 chain; HLA class II histocompatibility antigen, DR beta 5 chain; HLA class II histocompatibility antigen, DR-1 beta chain; HLA class II histocompatibility antigen, DR-5 beta chain; HLA class II histocompatibility antigen, DRB1-15 beta chain; HLA class II histocompatibility antigen, DRB1-16 beta chain; HLA class II histocompatibility antigen, DRB1-3 chain; HLA class II histocompatibility antigen, DRB1-7 beta chain; HLA class II histocompatibility antigen, DRB1-9 beta chain; HLA-DR antigens-associated invariant chain; HLA-DR-gamma; HLA-DRB5; human leucocyte antigen DRB1; human leucocyte antigen DRB3; human leucocyte antigen DRB4; human leucocyte antigen DRB5; Ia antigen-associated invariant chain; Ia-associated invariant chain; Ii; leukocyte antigen; leukocyte antigen class II; lymphocyte antigen DRB1; MHC cell surface glycoprotein; MHC class I antigen; MHC Class II antigen; MHC class II antigen beta chain; MHC class II antigen DR beta 3 chain; MHC class II antigen DRA; MHC class II antigen DRB1*15; MHC class II antigen DRB1*16; MHC class II antigen DRB1*3; MHC class II antigen DRB1*9; MHC class II antigen DRB3; MHC class II antigen DRB4; MHC class II antigen DRB5; MHC class II antigen HLA-DR-beta; MHC class II DLA-DR-beta-1; MHC class II DLA-DRB; MHC class II DR beta 1; MHC class II HLA beta chain; MHC class II HLA-DR beta 1 chain; MHC class II HLA-DR beta 3 chain; MHC class II HLA-DR-beta cell surface glycoprotein; MHC class II HLA-DRw10-beta; MHC class2 antigen; MHC DLA-DR-beta-1 precursor; MHC HLA DR-beta chain; MHC HLA-DR gamma chain; MHC HLA-DR-beta cell surface glycoprotein; MHC HLA-DR-beta chain; p33; XXbac-BPG161M6.1
Gene Aliases: CD74; DHLAG; DLA-DRB1; DLA-DRBB1; DR-4; DR4; DRB; DRB1; DRB4; DRBB1; DRw10; HLA-DR1B; HLA-DR3B; HLA-DR4B; HLA-DRA; HLA-DRA1; HLA-DRB; HLA-DRB1; HLA-DRB2; HLA-DRB3; HLA-DRB4; HLA-DRB5; HLADG; Ia-GAMMA; II; LA-DRB; MLRW; SS1