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The exposed Serpin reactive centre loop controls the specificity of the serpin proteinase interaction. Mutations within this region have been used to generate novel potentially therapeutic inhibitors. In this study we examine the effect of the serpin scaffold and reactive centre loop length upon the generation of such inhibitors. The reactive centre loop regions, P7-P3', of alpha1-antitrypsin and alpha1-antichymotrypsin were replaced by the corresponding residues of the viral serpin, Serp1, to form AT/Serp1 and ACT/Serp1, respectively. AT/Serp1 formed SDS stable complexes with a range of proteinases with association rate constants for plasmin, tissue plasminogen activator, urokinase, thrombin and factor Xa of approximately 10(4) M(-1)s(-1) and a stoichiometry of inhibition of approximately 1 for all of them. ACT/Serp1, however, formed SDS-stable complexes with only plasmin and thrombin with association rate constant 100-fold slower than AT/Serp1 and an increased stoichiometry of inhibition. The reactive centre loop of ACT/Serp1 is four amino acid residues longer than AT/Serp1. These four additional residues (VETR) were inserted into AT/Serp1 to form AT/Serp1(VETR). AT/Serp1(VETR) formed SDS stable complexes with plasmin, thrombin and tissue plasminogen activator similar to AT/Serp1, however, the association rate constants were 10-fold slower than those observed with AT/Serp1, while the stoichiometry of inhibition remained around 1. These results suggest that the additional reactive centre loop residues effect the rate of initial complex formation by placing the reactive centre loop in a non-ideal conformation. This study demonstrates that both reactive centre loop length and serpin scaffold are important in defining the inhibitory characteristics of a serpin.

Protein engineering of chimeric Serpins: an investigation into effects of the serpin scaffold and reactive centre loop length