Enzymes Are Classified on the Basis of the Types of Reactions That They Catalyze Nomenclature命名： 1.Common names:with little information about the reactions. trypsin:a proteolytic enzyme secreted by the pancreas. 2.Most enzymes are named for their substrates and for the reactions that they catalyze,with the suffix "ase"added. ATPase:an enzyme that breaks down ATP, ATP synthase:an enzyme that synthesizes ATP. Nomenclature for enzymes:in 1964,Enzyme Commission of the International Union of Biochemistry(国际生化联盟) .Reactions were divided into six major groups.These groups were subdivided and further subdivided,so that a four-digit number preceded by the letters EC for Enzyme Commission could precisely identify all enzymes.Enzymes Are Classified on the Basis of the Types of Reactions That They Catalyze Nomenclature命名： 1. Common names： with little information about the reactions. - trypsin: a proteolytic enzyme secreted by the pancreas. 2. Most enzymes are named for their substrates and for the reactions that they catalyze, with the suffix "ase" added. - ATPase: an enzyme that breaks down ATP, - ATP synthase: an enzyme that synthesizes ATP. Nomenclature for enzymes：in 1964，Enzyme Commission of the International Union of Biochemistry（国际生化联盟） •Reactions were divided into six major groups. These groups were subdivided and further subdivided, so that a four-digit number preceded by the letters EC for Enzyme Commission could precisely identify all enzymes