ICOS, also known as inducible T-cell costimulator, is a member of the CD28 family of immune- assisted stimulatory receptors. The interaction of B7-H2 / ICOS plays a crucial role in Th cell differentiation, T-B cell interaction and humoral immune response essential for the formation of reproductive centers and the production of cytokine IL-4. In addition, this protein is more potent in inducing IL-10 production, a cytokine important for the inhibitory function of T regulatory cells. The B7-1 / B7-2-CD28 / CTLA-4 and ICOS-B7RP-1 pathways provide an important second signal that can regulate the activation, inhibition and fine regulation of T-lymphocyte responses. It stimulates production of Th1 and Th2 cytokines, but may play a role in the generation of Th2 cells. Recombinant human ICOS, fused to hIgG-His-Tag at C-terminal, expressed in insect cell and purified by using conventional chromatography techniques. Source: Recombinant protein corresponding to aa21-140 of human ICOS, fused to hIgG-His-Tag at C-terminal, expressed in insect cell. Molecular Weight: ~40.8kD (362aa), ~40-57kD (SDS-PAGE under reducing conditions) Endotoxin: <1EU/1ug (determined by LAL method) AA Sequence: ADPRQRKNEA LAPPLLDAEP ARGAGGRGGD HPSVAVGIRR VSNVSAASLV PAVPQPEADN LTLRYRSLVY QLNFDQTLRN VDKAGTWAPR ELVLVVQVHN RPEYLRLLLD SLRKAQGIDN VLVIFSHDFW STEINQLIAG VNFCPVLQVF FPFSIQLYPN EFPGSDPRDC PRDLPKNAAL KLGCINAEYP DSFGHYREAK FSQTKHHWWW KLHFVWERVK ILRDYAGLIL FLEEDHYLAP DFYHVFKKMW KLKQQECPEC DVLSLGTYSA SRSFYGMADK VDVKTWKSTE HNMGLALTRN AYQKLIECTD TFCTYDDYNW DWTLQYLTVS CLPKFWKVLV PQIPRIFHAG DCGMHHKKTC RPSTQSAQIE SLLNNNKQYM FPETLTISEK FTVVAISPPR KNGGWGDIRD HELCKSYRRL QHHHHHH Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
