CD4 Protein (CD4) (His tag)

Catalog No. ABIN7320016

Product Details

Target: CD4

Protein Type: Recombinant

Biological Activity: Active

Origin: Mouse

Source: HEK-293 Cells

Purification tag / Conjugate: This CD4 protein is labelled with His tag.

Purpose: Recombinant Mouse CD4/LEU3 Protein (His Tag)(Active)

Sequence: Met 1-Thr 394

Characteristics: A DNA sequence encoding the extracellular domain of mouse CD4 (NP_038516.1) (Met 1-Thr 394) was expressed, fused with a polyhistidine tag at the C-terminus.

Purity: > 95 % as determined by SDS-PAGE

Endotoxin Level: < 1.0 EU per μg of the protein as determined by the LAL method.

Biological Activity Comment: Measured by the ability of the immobilized protein to support the adhesion of NIH-3T3 mouse embryonic fibroblast cells. When 5 x 10E4 cells/well are added to mCD4-His coated plates (0.8μg/mL and 100μL/well), approximately >50% will adhere specifically after 30 minutes at 37°C.

Application Details

Restrictions: For Research Use only

Handling

Format: Lyophilized

Reconstitution: Please refer to the printed manual for detailed information.

Buffer: Lyophilized from sterile PBS, pH 7.4

Storage: 4 °C,-20 °C,-80 °C

Storage Comment: Generally, lyophilized proteins are stable for up to 12 months when stored at -20 to -80°C. Reconstituted protein solution can be stored at 4-8°C for 2-7 days. Aliquots of reconstituted samples are stable at < -20°C for 3 months.

Target Details

Target: CD4

Alternative Name: CD4 (CD4 Products)

Synonyms: cd4 Protein, L3T4 Protein, Ly-4 Protein, CD4mut Protein, W3/25 Protein, p55 Protein, CD4 molecule Protein, carcinoembryonic antigen-related cell adhesion molecule 5 Protein, T-cell surface glycoprotein CD4 Protein, CD4 antigen Protein, Cd4 molecule Protein, CD4 Protein, LOC100125525 Protein, cd4 Protein, Cd4 Protein

Background:

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. All human tissue sources of CD4 bind radiolabeled gp120 to the same relative degree; however, the murine homologous protein, L3T4, does not bind the HIV envelope protein. 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. The CD4 molecule is currently the object of intense interest and investigation both because of its role in normal T-cell function, and because of its role in HIV infection. 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. Amino acids in both helices found in the cytoplasmic region of VpU in membrane-mimicking detergent micelles experience chemical shift perturbations upon binding to CD4, whereas amino acids between the two helices and at the C-terminus of VpU show no or only small changes, respectively. Paramagnetic spin labels were attached at three sequence positions of a CD4 peptide comprising the transmembrane and cytosolic domains of the receptor. VpU binds to a membrane-proximal region in the cytoplasmic domain of CD4.

Synonym: L3T4;Ly-4

Molecular Weight: 42.8 kDa

NCBI Accession: NP_038516

Pathways: TCR Signaling, Maintenance of Protein Location, CXCR4-mediated Signaling Events