5扣制剂 底物 Substrate 底物可与酶活 性位点结合 (a) Substrate normally can bind to the active site of an enzyme 酶 抑制剂 inhibi 竞争性抑制剂 (b)A competitive inhibitor mimics the subtrate and competes for the active site. (c)A noncompetitive inhibitor binds to the 非竞争性抑制剂 enzyme at a location away from the active site, but alters the conformation of the enzyme so that the active site is no longer竞争性抑制剂 非竞争性抑制剂 底物可与酶活 性位点结合 5.抑制剂 底物 酶 抑制剂 抑制剂