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- 2025年10月16日
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| 产品编号 | bs-17539P |
| 英文名称 | HLA Class II DR4 Antibody Blocking Peptide |
| 中文名称 | HLA Class II DR4封闭多肽 |
| 纯化方法 | HPLC |
| 研究领域 | Immunology > Adaptive Immunity > MHC > Class II |
| 亚基 | Heterodimer of an alpha and a beta subunit; also referred as MHC class II molecule. In the endoplasmic reticulum (ER) it forms an heterononamer; 3 MHC class II molecules bind to a CD74 homotrimer (also known as invariant chain or HLA class II histocompatibility antigen gamma chain). |
| 亚细胞定位 | Cell membrane; Single-pass type I membrane protein. Endoplasmic reticulum membrane; Single-pass type I membrane protein. Golgi apparatus, trans-Golgi network membrane; Single-pass type I membrane protein. Endosome membrane; Single-pass type I membrane protein. Lysosome membrane; Single-pass type I membrane protein. Late endosome membrane; Single-pass type I membrane protein. Note=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. |
| 翻译后修饰 | 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. |
| 相似性 | Belongs to the MHC class II family. Contains 1 Ig-like C1-type (immunoglobulin-like) domain. |
| 功能 | 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. |
| 保存条件 | Shipped at 4℃. Stored at -20℃ for one year. Avoid repeated freeze/thaw cycles. |
| 注意事项 | This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications. |
| 背景资料 | HLA-DRA is one of the HLA class II alpha chain paralogues. This class II molecule is a heterodimer consisting of an alpha and a beta chain, 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 alpha chain is approximately 33-35 kDa and its 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. [provided by RefSeq] |
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文献和实验Assembly of Matched Alpha/Beta Subunits to HLA Class II Peptide Receptors
on the same chromosome) or trans (encoded on different chromosomes) combinations. Since some of the α–β combinations may yield mismatched non-functional α–β heterodimers, it is not entirely clear which type of HLA class II peptide receptors are found on the cell surface
Studying MHC Class II Peptide Loading and Editing In Vitro
of major histocompatibility complex (MHC) class II molecules upon binding of antigenic peptides and the effect of DM on the interactions. Using purified soluble molecules, in this chapter, we describe several in vitro methods for measuring peptide binding to HLA-DR molecules
Identification of MHC Class II Binding Peptides: Microarray and Soluble MHC Class II Molecules
binding peptides. We present here a high content screening for MHC class II (HLA-DR) binding to a peptide library in a chip-format. Binding of soluble MHC class II molecules to individual peptides can be visualized using an anti-DR directed monoclonal
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