PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Defects in PPIB are the cause of osteogenesis imperfecta type 9 (OI9). OI9 is a connective tissue disorder characterized by bone fragility, low bone mass and bowing of limbs due to multiple fractures. Short limb dwarfism and blue sclerae are observed in some but not all patients. Belongs to the cyclophilin-type PPIase family. PPIase B subfamily. Note: This description may include information from UniProtKB.
Protein type: Secreted, signal peptide; Secreted; Chaperone; Isomerase; Cyclophilin; EC 220.127.116.11
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.