Recombinant Anti-HLA-DRB4 antibody [EPR7183] (ab126767)


  • Product name

    Anti-HLA-DRB4 antibody [EPR7183]
    See all HLA-DRB4 primary antibodies
  • Description

    Rabbit monoclonal [EPR7183] to HLA-DRB4
  • Host species

  • Specificity

    ab126767 is predicted to cross-react with DRB1-16 beta chain, DRB1-15 beta chain, DRB1-13 beta chain, DRB1-12 beta chain, DRB1-11 beta chain, DRB1-10 beta chain, DRB1-8 beta chain, DRB1-3 beta chain and DRB1-1 beta chain.
  • Tested applications

    Suitable for: WB, IHC-P, Flow Cytmore details
    Unsuitable for: ICC or IP
  • Species reactivity

    Reacts with: Human
  • Immunogen

    Synthetic peptide, ocrresponding to residues in the extracellular domain of Human HLA-DRB4 (P13762).

  • Positive control

    • Human fetal thymus, Human lymph node, Human tonsil and Raji lysates; Human tonsil and colon tissues.
  • General notes

    Mouse, Rat: We have preliminary internal testing data to indicate this antibody may not react with these species. Please contact us for more information.


    Our RabMAb® technology is a patented hybridoma-based technology for making rabbit monoclonal antibodies. For details on our patents, please refer to RabMab® patents.

    This product is a recombinant rabbit monoclonal antibody.


  • Form

  • Storage instructions

    Shipped at 4°C. Store at -20°C. Stable for 12 months at -20°C.
  • Dissociation constant (KD)

    KD = 5.50 x 10 -11 M
    Learn more about KD
  • Storage buffer

    pH: 7.20
    Preservative: 0.01% Sodium azide
    Constituents: 9% PBS, 40% Glycerol, 0.05% BSA, 50% Tissue culture supernatant
  • Purity

    Tissue culture supernatant
  • Clonality

  • Clone number

  • Isotype

  • Research areas


Our Abpromise guarantee covers the use of ab126767 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
WB 1/1000 - 1/10000. Predicted molecular weight: 30 kDa.
IHC-P 1/100 - 1/250. Perform heat mediated antigen retrieval before commencing with IHC staining protocol.
Flow Cyt 1/10 - 1/100.

ab172730 - Rabbit monoclonal IgG, is suitable for use as an isotype control with this antibody.


  • Application notes
    Is unsuitable for ICC or IP.
  • Target

    • 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 accomodates 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 similarities

      Belongs to the MHC class II family.
      Contains 1 Ig-like C1-type (immunoglobulin-like) domain.
    • Post-translational

      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.
    • Cellular localization

      Cell 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 4 antibody
      • DR beta 4 chain antibody
      • DR4 antibody
      • DRB1 transplantation antigen antibody
      • DRB4 antibody
      • DRB4_HUMAN antibody
      • HLA class II histocompatibility antigen antibody
      • HLA class II histocompatibility antigen DR beta 4 chain antibody
      • HLA-DRB4 antibody
      • Human leucocyte antigen DRB4 antibody
      • Leukocyte antigen antibody
      • Major histocompatibility complex class II DR beta 4 antibody
      • MHC class II antigen DRB4 antibody
      • MHC class II antigen HLA DR beta antibody
      • MHC class2 antigen antibody
      • MHC HLA DR-beta chain antibody
      see all


    • All lanes : Anti-HLA-DRB4 antibody [EPR7183] (ab126767) at 1/1000 dilution

      Lane 1 : Human fetal thymus lysate
      Lane 2 : Human lymph node lysate
      Lane 3 : Human tonsil lysate
      Lane 4 : Raji lysate

      Lysates/proteins at 10 µg per lane.

      All lanes : Goat anti-Rabbit HRP at 1/2000 dilution

      Predicted band size: 30 kDa

    • ab126767, at 1/100, staining HLA-DRB4 in Paraffin-embedded Human tonsil tissue by Immunohistochemistry.
    • ab126767, at 1/100, staining HLA-DRB4 in Paraffin-embedded Human colon tissue by Immunohistochemistry.
    • Equilibrium disassociation constant (KD)
      Learn more about KD

      Click here to learn more about KD


    ab126767 has not yet been referenced specifically in any publications.

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