Dipeptidyl Peptidase IV (DPP4) ELISA Kit for Human

The protein encoded by this gene is identical to adenosine deaminase complexing protein-2, and to the T-cell activation antigen CD26. It is an intrinsic membrane glycoprotein and a serine exopeptidase that cleaves X-proline dipeptides from the N-terminus of polypeptides. [provided by RefSeq, Jul 2008]

DPP4: Cell surface glycoprotein receptor involved in the costimulatory signal essential for T-cell receptor (TCR)-mediated T-cell activation. Acts as a positive regulator of T-cell coactivation, by binding at least ADA, CAV1, IGF2R, and PTPRC. Its binding to CAV1 and CARD11 induces T-cell proliferation and NF- kappa-B activation in a T-cell receptor/CD3-dependent manner. Its interaction with ADA also regulates lymphocyte-epithelial cell adhesion. In association with FAP is involved in the pericellular proteolysis of the extracellular matrix (ECM), the migration and invasion of endothelial cells into the ECM. May be involved in the promotion of lymphatic endothelial cells adhesion, migration and tube formation. When overexpressed, enhanced cell proliferation, a process inhibited by GPC3. Acts also as a serine exopeptidase with a dipeptidyl peptidase activity that regulates various physiological processes by cleaving peptides in the circulation, including many chemokines, mitogenic growth factors, neuropeptides and peptide hormones. Removes N-terminal dipeptides sequentially from polypeptides having unsubstituted N-termini provided that the penultimate residue is proline. Belongs to the peptidase S9B family. DPPIV subfamily.

Protein type: EC 3.4.14.5; Membrane protein, integral; Cell surface; Protease; Cell adhesion

Chromosomal Location of Human Ortholog: 2q24.3

Cellular Component: intercellular canaliculus; focal adhesion; cell surface; membrane; endocytic vesicle; lysosomal membrane; lamellipodium; apical plasma membrane; integral to membrane; plasma membrane; lipid raft

Molecular Function: identical protein binding; protein binding; protein homodimerization activity; protease binding; dipeptidyl-peptidase activity; serine-type peptidase activity; serine-type endopeptidase activity; receptor binding

Biological Process: regulation of cell-cell adhesion mediated by integrin; T cell activation; positive regulation of cell proliferation; T cell costimulation; response to hypoxia; endothelial cell migration; proteolysis