title: Crystal structure of the complex of subtilisin BPN' with its protein inhibitor Streptomyces subtilisin inhibitor. The structure at 4.3 Angstroms resolution.
mesh_terms: D001426:Bacterial Proteins; D008958:Models, Molecular; D011487:Protein Conformation; D013302:Streptomyces / Q000201:enzymology; D013379:Substrate Specificity; D013381:Subtilisins / Q000037:antagonists & inhibitors; D014357:Trypsin; D014361:Trypsin Inhibitors; D014961:X-Ray Diffraction
chemical_list: D001426:Bacterial Proteins; D014361:Trypsin Inhibitors; D013381:Subtilisins; D014357:Trypsin