... Subsequently,insulin was added, and a stable nonenzymatic rate wasrecorded. Finally, PDI was added, and the total NADPHoxidation rate was recorded.The oxidase and isomerase activities of PDI were mea-sured ... reaction times, the refoldingmixture was acidified and immediately analyzed by RP-HPLC. The amounts of native and linear tx 3a were calculated from their elution peakareas. The data are the average ... maturecPDI protein has a calculated molecular mass of 54 913.7 Da and an isoelectric point of 4.6. The cPDIcontains four thioredoxin domains and an acidic C-ter-minal tail (a, b, b¢, a and...