FKBP12 (Fkbp1a) is a member of the FK-506-binding protein (FKBP) family. This family of proteins possesses peptidyl-prolyl cis-trans isomerase (PPIase) activity and is believed to play an important role in accelerating the rate at which proteins fold into their native conformations (1). FKBP12 was originally identified as a cytosolic receptor for the immunosuppressant drugs, FK506 and rapamycin, and later shown to be involved in cell-cycle regulation and in intracellular calcium homeostasis. Binding of FKBP12 to rapamycin through its FK506/rapamycin-binding/ PPIase domain mediates the immunosuppressive and anti-tumor effects of rapamycin, a drug that has been shown to arrest tumor cells in G1 phase of the cell cycle and to reduce tumor angiogenesis (2). FKBP12 is highly conserved from yeast through human and is relatively abundant in most tissues and cell types (3).
TGF Beta Signaling Pathway
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