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Recombinant Human CD4/LEU3 Protein (aa 1-208, His Tag)(Active)
SKU: PKSH031631-100
Recombinant Human CD4/LEU3 Protein (aa 1-208, His Tag)(Active)
| SKU # | PKSH031631 |
| Expression Host | HEK293 Cells |
Description
| Synonyms | CD4, CD4mut, Scd4, T-cell surface antigen T4/Leu-3, T-cell surface glycoprotein CD4 |
| Species | Human |
| Expression Host | HEK293 Cells |
| Sequence | Met 1-Ser 208 |
| Accession | NP_000607.1 |
| Calculated Molecular Weight | 21.7 kDa |
| Observed Molecular Weight | 26 kDa |
| Tag | C-His |
| Bio-activity | 1. Measured by its ability to bind biotinylated GP140-His in a functional ELISA. 2. Measured by the ability of the immobilized protein to support the adhesion of HeLa human cervical epithelial carcinoma cells. When 5 x 104 cells/well are added to CD4-coated plates (2. 5 μg/ml and 100 μl/well), approximately 40 %-60 % will adhere specifically after 60 minutes at 37℃. |
Properties
| Purity | > 94 % as determined by reducing SDS-PAGE. |
| Endotoxin | < 1.0 EU per μg of the protein as determined by the LAL method. |
| Storage | Generally, lyophilized proteins are stable for up to 12 months when stored at -20 to -80℃. Reconstituted protein solution can be stored at 4-8℃ for 2-7 days. Aliquots of reconstituted samples are stable at < -20℃ for 3 months. |
| Shipping | This product is provided as lyophilized powder which is shipped with ice packs. |
| Formulation | Lyophilized from sterile PBS, pH 7.4 Normally 5% - 8% trehalose, mannitol and 0.01% Tween 80 are added as protectants before lyophilization. Please refer to the specific buffer information in the printed manual. |
| Reconstitution | Please refer to the printed manual for detailed information. |
Background
T-cell surface glycoprotein CD4, is a single-pass type I membrane protein. CD4 contains three Ig-like C2-type (immunoglobulin-like) domains and one Ig-like V-type (immunoglobulin-like) domain. CD4 is a glycoprotein expressed on the surface of T helper cells, regulatory T cells, monocytes, macrophages, and dendritic cells. The CD4 surface determinant, previously associated as a phenotypic marker for helper/inducer subsets of T lymphocytes, has now been critically identified as the binding/entry protein for human immunodeficiency viruses (HIV). The human CD4 molecule is readily detectable on monocytes, T lymphocytes, and brain tissues. CD4 is a co-receptor that assists the T cell receptor (TCR) to activate its T cell following an interaction with an antigen presenting cell. Using its portion that resides inside the T cell, CD4 amplifies the signal generated by the TCR. CD4 interacts directly with MHC class II molecules on the surface of the antigen presenting cell via its extracellular domain. CD4 is a primary receptor used by HIV-1 to gain entry into host T cells. HIV infection leads to a progressive reduction of the number of T cells possessing CD4 receptors. Viral protein U (VpU) of HIV-1 plays an important role in downregulation of the main HIV-1 receptor CD4 from the surface of infected cells. Physical binding of VpU to newly synthesized CD4 in the endoplasmic reticulum is an early step in a pathway leading to proteasomal degradation of CD4.