CD4 Human, Active

CD4 Human produced in HEK293 cells is a single, glycosylated polypeptide chain containing 604 amino acids (26-390 a.a.) and having a molecular mass of 67.7kDa. CD4 is expressed with a 239 amino acid hIgG-His-tag at C-Terminus and purified by proprietary chromatographic techniques.

HEK293 Cells

CD4 Human protein solution (0.25mg/ml) contains 40% Glycerol and Phosphate-Buffered Saline (pH 7.4).

Greater than 90.0% as determined by SDS-PAGE.

≤ 10 ug/ml, defined by the ability of the immobilized protein to support the adhesion of HeLa human cervical epithelialcarcinoma cells When cells are added to human CD4 coated plates.

KKVVLGKKGD TVELTCTASQ KKSIQFHWKN SNQIKILGNQ GSFLTKGPSK LNDRADSRRS LWDQGNFPLI IKNLKIEDSD TYICEVEDQK EEVQLLVFGL TANSDTHLLQ GQSLTLTLES PPGSSPSVQC RSPRGKNIQG GKTLSVSQLE LQDSGTWTCT VLQNQKKVEF KIDIVVLAFQ KASSIVYKKE GEQVEFSFPL AFTVEKLTGS GELWWQAERA SSSKSWITFD LKNKEVSVKR VTQDPKLQMG KKLPLHLTLP QALPQYAGSG NLTLALEAKT GKLHQEVNLV VMRATQLQKN LTCEVWGPTS PKLMLSLKLE NKEAKVSKRE KAVWVLNPEA GMWQCLLSDS GQVLLESNIK VLPTWLEPKS CDKTHTCPPC PAPELLGGPS VFLFPPKPKD TLMISRTPEV TCVVVDVSHE DPEVKFNWYV DGVEVHNAKT KPREEQYNST YRVVSVLTVL HQDWLNGKEY KCKVSNKALP APIEKTISKA KGQPREPQVY TLPPSRDELT KNQVSLTCLV KGFYPSDIAV EWESNGQPEN NYKTTPPVLD SDGSFFLYSK LTVDKSRWQQ GNVFSCSVMH EALHNHYTQK SLSLSPGKHH HHHH. 

SDS

ProSpec's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.

CD4 protein, also known as Cluster of Differentiation 4, is a cell surface glycoprotein primarily expressed on helper T cells. It plays a crucial role in immune system regulation by mediating interactions between T cells and antigen-presenting cells (APCs). This research aims to explore the function, signaling pathways, and significance of CD4 protein in T cell biology and disease pathogenesis.

Function of CD4 Protein:

CD4 protein serves as a co-receptor for the T cell receptor (TCR) and interacts with major histocompatibility complex class II (MHC-II) molecules on APCs. This interaction enables CD4+ T cells to recognize and respond to antigenic peptides presented by MHC-II. CD4 protein enhances TCR signaling and facilitates the formation of immunological synapses between T cells and APCs, thereby promoting efficient T cell activation, proliferation, and differentiation.

Role of CD4 Protein in T Cell Differentiation:

CD4 protein is involved in determining the differentiation fate of CD4+ T cells. By interacting with specific cytokines secreted by APCs, CD4 protein directs the differentiation of naive T cells into distinct effector T cell subsets, including Th1, Th2, Th17, and regulatory T cells (Tregs). Each subset exhibits unique functions and cytokine profiles, contributing to immune responses, inflammation, and immune tolerance.

Signaling Pathways Activated by CD4 Protein:

Upon engagement with MHC-II, CD4 protein initiates signaling cascades that regulate T cell activation and differentiation. The cytoplasmic tail of CD4 contains conserved motifs, such as immunoreceptor tyrosine-based activation motifs (ITAMs) and proline-rich regions, which recruit and activate various signaling molecules, including protein kinases and adaptor proteins. These signaling events culminate in the activation of transcription factors, such as NF-κB and AP-1, which control gene expression required for T cell function.

Implications of CD4 Protein in Disease Pathogenesis:

Dysregulation of CD4 protein expression or function can lead to immune dysfunctions and contribute to the development of various diseases. CD4 protein is a primary receptor for human immunodeficiency virus (HIV) entry into CD4+ T cells, resulting in the destruction of these crucial immune cells and the progression of acquired immunodeficiency syndrome (AIDS). Moreover, altered CD4+ T cell responses and imbalances in T cell subsets have been associated with autoimmune diseases, allergic reactions, and chronic inflammatory conditions.

Conclusion:

The investigation of CD4 protein in T cell biology provides valuable insights into its role in immune system regulation and disease pathogenesis. Understanding the function and signaling pathways of CD4 protein enhances our knowledge of T cell activation, differentiation, and immune responses. Further research on CD4 protein may lead to the development of targeted therapies for immune-related disorders and provide novel strategies for immune modulation.