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Invitrogen
Human HLA-DQA1 Control Fragment Recombinant Protein
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Product Details
RP-90588
Product Specifications
Species
Human
Expression System
E. coli
Amino acid sequence
DHVASCGVNLYQFYGPSGQYTHEFDGDEQFYVDLERKETAWRWPEFSKFGGFDPQGALRNMAVAKHNLNIMIKRYNSTAATNEVPEVTVFSKSPVTLGQPNTLI
Tag
His-ABP-tag
Class
Recombinant
Type
Protein
Purity
>80% by SDS-PAGE and Coomassie blue staining
Conjugate
Unconjugated
Unconjugated
Unconjugated
Form
Liquid
Concentration
≥5.0 mg/mL
Purification
purified
Storage buffer
1M urea/PBS, pH 7.4
Contains
no preservative
Storage conditions
-20°C, Avoid Freeze/Thaw Cycles
Shipping conditions
Wet ice
Product Specific Information
Highest antigen sequence indentity to the following orthologs: Mouse (64%), Rat (64%).
This recombinant protein control fragment may be used for blocking experiments with the corresponding antibody, PA5-52927. In IHC/ICC and WB experiments, we recommend a 100x molar excess of the protein fragment control based on the concentration and the molecular weight. Pre-incubate the antibody-protein control fragment mixture for 30 min at room temperature.
Target Information
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.
HLA and MHC antibodies play a significant role in Immunopeptidomics, facilitating the identification and characterization of neoantigens through high-performance liquid chromatography coupled to tandem Mass Spectrometry.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
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Bioinformatics
Protein Aliases: DC-1 alpha chain; DC-alpha; DQ alpha; HLA class II histocompatibility antigen DQ alpha chain; HLA DQ-alpha; HLA-DQ alpha chain; HLA-DQA1; HLA-DQA2; human leukocyte antigen DQA1/DRA; MHC class II antigen DQA1; MHC class II DQ alpha chain; MHC class II DQ-alpha protein; MHC class II DQA1; MHC class II HLA-D alpha glycoprotein; MHC class II HLA-DQ-alpha-1; MHC class II protein; MHC DQ alpha protein precursor; MHC HLA-DQ alpha; MHC HLA-DQ-alpha chain precursor old gene name 'HLA-DQA'; MHC HLA-DQ-alpha precursor; MHC HLA-DQA1-alpha protein; unnamed protein product
Gene Aliases: CELIAC1; DQ-A1; DQA1; HLA-DQA; HLA-DQA1*
UniProt ID: (Human) P01909
Entrez Gene ID: (Human) 3117
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