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Circular dichroism spectra of trypsin and chymotrypsin complexes with Bowman-Birk or chickpea trypsin inhibitor.

Circular dichroism spectra of trypsin and chymotrypsin complexes with Bowman-Birk soybean inhibitor or chickpea inhibitor have been determined at neutral and acid pH. Trypsin spectra show no evidence of conformational change accompanying the binding of either inhibitor to the enzyme. The formation of chymotrypsin-inhibitor complexes may involve a minor change in tertiary structure, as shown by a CD shift between 250 and 320 nm.