Topic summaryFKBP12 Expand Summary Extracted from the Wikipedia article FKBP1A. Peptidyl-prolyl cis-trans isomerase FKBP1A is an enzyme that in humans is encoded by the FKBP1Agene. It is also commonly referred to as FKBP-12 or FKBP12 and is a member of a family of FK506-binding proteins (FKBPs). Wikipedia source