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The bovine chymotrypsin–bovine pancreatic trypsin inhibitor (BPTI) interaction belongs to extensively studied models of protein–protein recognition. The accommodation of the inhibitor P1 residue in the S1 binding site of the enzyme forms the hot spot of this interaction. Mutations introduced at the P1 position of BPTI result in a more than five orders of magnitude difference of the association constant...
The stoichiometric complex formed between bovine β-trypsin and the Cucurbita maxima trypsin inhibitor I (CMTI-I) was crystallized and its X-ray crystal structure determined using Patterson search techniques. Its structure has been crystallographically refined to a final R value of 0.152 (6.0 - 2.0 Å). CMTI-I is of ellipsoidal shape; it lacks helices or β-sheets, but consists of turns and connecting...
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