... of the PDI [42], and t hat this site is far away from the redox active sites in the sequ ence. Furthermore, the measurements of the rates of PDI-catalysed refolding of scrambled RNase A, in the ... (225 mM)9:1(25 mM). At the end of the incubation, 40 lL of the mixturewas added to each of the five solutions; these were then leftto react on ice for 5 min. The reaction mixtures w ereanalysed ... of the active site in the N-unit. As regards the oxidative activity, the two units alsodisplay differences in their functional properties, with the site at the C-termus always predominant, the...