P1 and P2' site mutations convert protease nexin-2 from a factor XIa inhibitor to a plasmin inhibitor.

Abstract excerpt

The kunitz protease inhibitor domain of PN2 (PN2KPI) is a potent and specific inhibitor (K(i) 0.5-2 nM) of factor XIa (FXIa) and inhibits cerebrovascular thrombosis in mice. To determine whether the antithrombotic properties of PN2KPI arise from its FXIa-inhibitory activity, we have now prepared mutant forms of PN2KPI. Mutations at the P1 (Arg(15)) site in combination with P2' (Met(17)) mutations profoundly...

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