Chymotrypsinogen B2 (CTRB2)

Chymotrypsinogen B2 is a isozyme of Chymotrypsin. Chymotrypsin is a digestive enzyme that can perform proteolysis. Chymotrypsin preferentially cleaves peptide amide bonds where the carboxyl side of amide bond (the S1 position) is a tyrosine, tryptophan, or phenylalanine. These amino acids contain an aromatic ring in their sidechain that fits into a """hydrophobic pocket""" (the P1 position) of the enzyme. The hydrophobic and shape complementarity between the peptide substrate S1 sidechain and the enzyme P1 binding cavity accounts for the substrate specificity of this enzyme. Chymotrypsin also hydrolyzes other amide bonds in peptides at slower rates, particularly those containing leucine at the S1 position.Chymotrypsin is synthesized in the pancreas by protein biosynthesis as a precursor called chymotrypsinogen that is enzymatically inactive.