Anti-HLA DR antibody [GRB-1] (PerCP) (ab91333)


  • Product nameAnti-HLA DR antibody [GRB-1] (PerCP)
    See all HLA DR primary antibodies
  • Description
    Mouse monoclonal [GRB-1] to HLA DR (PerCP)
  • ConjugationPerCP. Ex: 482nm, Em: 675nm
  • SpecificityReacts with cells of the monocytic lineage, with myeloblasts and promyelocytes and cells of the B lymphocyte lineage. Does not react with polymorphonuclear leukocytes and platelets.
  • Tested applicationsSuitable for: Flow Cytmore details
  • Species reactivity
    Reacts with: Human
  • Immunogen

    Stimulated Human B lymphocytes

  • Positive control
    • Normal EDTA-anticoagulated peripheral blood. Nalm-6 cell line.


  • FormLiquid
  • Storage instructionsShipped at 4°C. Store at +4°C.
  • Storage bufferPreservative: 0.09% Sodium Azide
    Constituents: 1% BSA, pH 7.2
  • Concentration information loading...
  • PurityImmunogen affinity purified
  • ClonalityMonoclonal
  • Clone numberGRB-1
  • IsotypeIgG2a
  • Research areas


Our Abpromise guarantee covers the use of ab91333 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
Flow Cyt
  • Application notesFlow Cyt: Use at an assay dependent dilution.

    Not yet tested in other applications.
    Optimal dilutions/concentrations should be determined by the end user.
  • Target

    • FunctionBinds 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 an 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.
    • Sequence similaritiesBelongs to the MHC class II family.
      Contains 1 Ig-like C1-type (immunoglobulin-like) domain.
    • Post-translational
      Ubiquitinated by MARCH1 or MARCH8 at Lys-244 leading to down-regulation of MHC class II. When associated with ubiquitination of the beta subunit of HLA-DR: HLA-DRB4 'Lys-254', the down-regulation of MHC class II may be highly effective.
    • Cellular localizationCell membrane. Endoplasmic reticulum membrane. Golgi apparatus > trans-Golgi network membrane. Endosome membrane. Lysosome membrane. Late endosome membrane. The MHC class II complex transits through a number of intracellular compartments in the endocytic pathway until it reaches the cell membrane for antigen presentation.
    • Information by UniProt
    • Database links
    • Alternative names
      • DR alpha chain antibody
      • DR alpha chain precursor antibody
      • DRA_HUMAN antibody
      • DRB1 antibody
      • DRB4 antibody
      • Histocompatibility antigen HLA DR alpha antibody
      • HLA class II histocompatibility antigen antibody
      • HLA class II histocompatibility antigen DR alpha chain antibody
      • HLA DR1B antibody
      • HLA DR3B antibody
      • HLA DRA antibody
      • HLA DRA1 antibody
      • HLA DRB1 antibody
      • HLA DRB3 antibody
      • HLA DRB4 antibody
      • HLA DRB5 antibody
      • HLA-DRA antibody
      • HLADR4B antibody
      • HLADRA1 antibody
      • HLADRB antibody
      • Major histocompatibility complex class II DR alpha antibody
      • Major histocompatibility complex class II DR beta 1 antibody
      • Major histocompatibility complex class II DR beta 3 antibody
      • Major histocompatibility complex class II DR beta 4 antibody
      • Major histocompatibility complex class II DR beta 5 antibody
      • MGC117330 antibody
      • MHC cell surface glycoprotein antibody
      • MHC class II antigen DRA antibody
      • MHC II antibody
      • MLRW antibody
      see all

    Anti-HLA DR antibody [GRB-1] (PerCP) images

    • Flow cytometry analysis of Human peripheral blood cells, staining HLA DR with ab91333.

      PBMCs were isolated using a Ficoll gradient and fixed using paraformaldehyde. The sample was incubated with the primary antibody (1/100 in 2% human serum, 0.5 mM EDTA in PBS) for 30 minutes at 4°C.

      Gating Strategy: FSC/SSC lymphocytes and then FSC-A/FSC-H singlets

      See Abreview

    References for Anti-HLA DR antibody [GRB-1] (PerCP) (ab91333)

    ab91333 has not yet been referenced specifically in any publications.

    Product Wall

    Abcam guarantees this product to work in the species/application used in this Abreview.
    Application Flow Cytometry
    Sample Human Cell (Peripheral blood cells)
    Specification Peripheral blood cells
    Preparation Cell harvesting/tissue preparation method: PBMCs were isolated using a Ficoll gradient
    Sample buffer: Ficoll/PBS
    Fixation Paraformaldehyde
    Permeabilization No
    Gating Strategy FSC/SSC lymphocytes and then FSC-A/FSC-H singlets

    Abcam user community

    Verified customer

    Submitted Sep 14 2012