Protease is an enzyme. It is essentially a protein. Protease is not a compound and therefore its formula cannot be given out. Protease are a class of enzymes involved in digesting proteins. The basic mode of action can be described as: Protein + Protease -----> Digested protein + protease Since enzymes do not react in a biochemical reaction (they are merely catalysis), protease appears on both sides of the reaction shown above