FKBP
![](/Images/godic/202501/13/Fkbp-surface-1fkj5457.png")
![An illustration of the same protein in the same orientation](/Images/godic/202501/13/Fkbp-cartoon-1fkj5457.png")
FKBP, or FK506 binding protein, is a family of proteins that have prolyl isomerase activity and are related to the cyclophilins in function, though not in amino acid sequence. FKBPs have been identified in many eukaryotes from yeast to humans and function as protein folding chaperones for proteins containing proline residues. Along with cyclophilin, FKBPs belong to the immunophilin family.