Osteopontin, Recombinant, Human (Bone Sialoprotein 1, Nephropontin, Secreted Phosphoprotein 1, SPP-1, Urinary Stone Protein, Uropontin, SPP1, BNSP, OPN, PSEC0156, MGC110940)

Osteopontin is a secreted glycoprotein that functions as a ligand to alphavbeta3 integrin and possibly other receptors. It binds tightly to hydroxyapatite and can act as a structural component of the extracellular mineralized matrix. Osteopontin is initially secreted as a 298aa protein, which is subject to multiple post-translational modifications including glycosylation, phosphorylation, and specific proteolytic cleavages into various smaller molecular weight fragments. Osteopontin is expressed in a wide range of cells and tissues including osteoblasts, various tumor cell lines, extraosseous cells in the inner ear, brain, kidney, deciduum, placenta and odontoblasts. In addition to its involvement in mineralized matrix formation, Osteopontin can also function as a cytokine that stimulates the release of IFN and IL-12, while inhibiting the production of IL-10. Recombinant human Osteopontin is a 298aa protein, which, due to glycosylation, migrates at an apparent molecular weight of 60-65kD by SDS-PAGE analysis under reducing conditions. Source: Recombinant protein corresponding to human Osteopontin, expressed in 293 cells. Biological Activity: Biological activity was determined by its ability to chemoattract human monocytes using a concentration range of 10-100ng/ml. Endotoxin Level: <0.1ng/ug (1EU/ug) AA Sequence: IPVKQADSGS SEEKQLYNKY PDAVATWLNP DPSQKQNLLA PQNAVSSEET NDFKQETLPS KSNESHDHMD DMDDEDDDDH VDSQDSIDSN DSDDVDDTDD SHQSDESHHS DESDELVTDF PTDLPATEVF TPVVPTVDTY DGRGDSVVYG LRSKSKKFRR PDIQYPDATD EDITSHMESE ELNGAYKAIP VAQDLNAPSD WDSRGKDSYE TSQLDDQSAE THSHKQSRLY KRKANDESNE HSDVIDSQEL SKVSREFHSH EFHSHEDMLV VDPKSKEEDK HLKFRISHEL DSASSEVN Storage and Stability: Lyophilized powder may be stored at -20 degrees C. Stable for 12 months at -20 degrees C. Reconstitute with sterile buffer or dH2O. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.