Human CellExp™CD4, human recombinant

CD4

Cluster of Differentiation 4 (CD4), also known as T-cell surface antigen T4/Leu-3 (LEU-3) and CD4mut, is a single-pass type I membrane glycoprotein, and is a member of the immunoglobulin superfamily. CD4 expressed on the surface of T helper cells, monocytes, macrophages, and dendritic cells. It has four immunoglobulin domains (D1 to D4) that are exposed on the extracellular surface of the cell: D1 and D3 resemble immunoglobulin variable (IgV) domains. D2 and D4 resemble immunoglobulin constant (IgC) domains. CD4 is a co-receptor that assists the T cell receptor (TCR) with an antigen-presenting cell. Using its portion that resides inside the T cell, CD4 amplifies the signal generated by the TCR by recruiting an enzyme, known as the tyrosine kinase lck, which is essential for activating many molecules involved in the signaling cascade of an activated T cell. CD4 also interacts directly with MHC class II molecules on the surface of the antigen-presenting cell using its extracellular domain. The extracellular domain adopts an immunoglobulin-like beta-sandwich with seven strands in 2 beta sheets, in a Greek key topology. CD4 has also been shown to interact with SPG21, Lck and Protein unc-119 homolog. 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. Therefore, medical professionals refer to the CD4 count to decide when to begin treatment for HIV-infected patients.

N/A

This protein rhCD4 is fused with Fc fragment of human IgG1 at the C-terminus, has a calculated MW of 68 kDa expressed. The predicted N-terminus is Lys26. Protein migrates as 80 kDa in reduced SDS-PAGE due to glycosylation.

CD4, CD-4, CD4mut, CD-4mut

CD4, CD-4, CD4mut, CD-4mut

920

CD4

Human

P01730

Yes

HEK 293 cells

≥98%

SDS-PAGE, N/A

< 1.0 EU per μg of the rhCD4 by the LAL method.

Measured by its ability to bind with HIV-1 gp120 in a functional ELISA.

Measured by its ability to bind with HIV-1 gp120 in a functional ELISA.

Measured by its ability to bind with HIV-1 gp120 in a functional ELISA.

N/A

N/A

-20°C

gel pack

Lyophilized

Lyophilized from 0.22 μm filtered solution in 50 mM Tris, 100 mM glycine, pH 7.5. Normally Mannitol or Trehalose are added as protectants before lyophilization.

Centrifuge the vial prior to opening. Reconstitute in PBS, pH 7.4. Do not vortex.

N/A

Centrifuge the vial prior to opening.

For Research Use Only! Not to be used in humans

CD4+ T helper cell marker or cluster differentiator of white blood cells in FACS or flow cytometry. Used offer coupled to magnetic beads. GENTAUR makes custom magnetic bead couplings on 50 and 250 nm beads for certain clones.

Human proteins, cDNA and human recombinants are used in human reactive ELISA kits and to produce anti-human mono and polyclonal antibodies. Modern humans (Homo sapiens, primarily ssp. Homo sapiens sapiens). Depending on the epitopes used human ELISA kits can be cross reactive to many other species. Mainly analyzed are human serum, plasma, urine, saliva, human cell culture supernatants and biological samples.

Recombinants or rec. proteins

recombinants