The cDNA fragment encoding full-length human dipeptidyl peptidase 4(DPP4) was expressed in vitro E.coli expression system. CUSABIO offers a custom tag service. DPP4 is a serine protease that regulates postprandial islet hormone secretion and glycemia by rapidly inactivating the incretin peptides, glucagon-like peptide-1, and glucose-dependent insulinotropic polypeptide. It also exerts noncatalytic effects through its interaction with ligands such as caveolin-1, extracellular matrix, CXCR4, and ADA. DPP4-ADA interaction stimulates T-cell action. DPP4 has also been confirmed to physically interact with caveolin-1 on antigen-presenting cells, inducing aggregation and phosphorylation, which activates NF-κB.
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