Solvent Effects on Activity and Conformation of Plasminogen Activator Inhibitor-1

We have studied effects of the solvent composition on the activity and the conformation of human plasminogen activator inhibitor-1 (PAI-1) from HT-1080 fibrosarcoma cells. Non-ionic detergents, including Triton X-100, reduced the inhibitory activity of PAI-1 more than 20-fold at 0° C, but less than 2-fold at 37° C, while glycerol partly prevented the detergent-induced activity-loss at 0° C. The activity-loss was associated with an increase in PAI-1 substrate behaviour. Evaluating the PAI-1 conformation by proteolytic susceptibility of specific peptide bonds, we found that the V8-proteinase susceptibility of the Glu332-Ser333 (P17 -P16 ) bond, part of the hinge between the reactive centre loop (RCL) and b-strand 5A, and the endoproteinase Asp-N susceptibility of several bonds in the b-strand 2A-a-helix E region were increased by detergents at both 0 and 37° C. The susceptibility of the Gln321-Ala322 and the Lys325-Val326 bonds in b-strand 5A to papain and trypsin, respectively, was increased by detergents at 0° C, but not at 37° C, showing a strict correlation between proteinase susceptibility of b-strand 5A and activity-loss at 0° C. Since the b-strand 2A-a-helix E region also showed differential susceptibility to endoproteinase Asp-N in latent, active, and reactive centre-cleaved PAI-1, we propose that a detergent-induced conformational change of the b-strand 2A-a-helix E region influences the movements of b-sheet A, resulting in a cold-induced conformational change of b-strand 5A and thereby an increased substrate behaviour at low temperatures. These results provide new information about the structural basis for serpin substrate behaviour.