part_of part of part of proteolysis peptidase activity Reactome:R-HSA-5693319 Reactome:R-HSA-5684864 Reactome:R-HSA-3139027 Reactome:R-HSA-205112 Reactome:R-HSA-448678 molecular_function proteinase activity GO:0008233 Reactome:R-HSA-5655483 EC:3.4 hydrolase, acting on peptide bonds peptide hydrolase activity Reactome:R-HSA-376149 Reactome:R-HSA-3000243 Reactome:R-HSA-5685902 protease activity Catalysis of the hydrolysis of a peptide bond. A peptide bond is a covalent bond formed when the carbon atom from the carboxyl group of one amino acid shares electrons with the nitrogen atom from the amino group of a second amino acid. hydrolase activity catalytic activity, acting on a protein