Potato serine protease inhibitor (PSPI) constitutes about 22% of the total amount of proteins in potato tubers (cv. Elkana), making it the most abundant protease inhibitor in the plant. PSPI is a heterodimeric double-headed Kunitz-type serine protease inhibitor that can tightly and simultaneously bind two serine proteases by mimicking the substrate of the enzyme with its reactive-site loops. Here, the crystal structure of PSPI is reported, representing the first heterodimeric doubleheaded Kunitz-type serine protease inhibitor structure to be determined. PSPI has a-trefoil fold and, based on the structure, two reactive-site loops bearing residues Phe75 and Lys95 were identified.
|Journal||Acta Crystallographica Section D-Biological Crystallography|
|Publication status||Published - 2012|
- macromolecular crystallography
- chymotrypsin inhibitor
- cv elkana