绝对特异性 .NH2 urease +H20 2NH3+C02 NH2 urea NH-CH3 0=C H2oX→ NH2 methyl urea
相对特异性 protein kinase A To phopharylate the-OH group of serine protein kinase C and threonine in the substrate proteins, protein kinaseG leading to the activation of proteins
1 CH2OH CH2OH H sucrose CH2OH OH CH2OH OH sucrase H —CH2 CH2OH H raffinose CH2OH OH OH H
立体异构特异性 H H H3C E B 乳糖脱氢酶仅催化L乳糖的反应，而不催化D乳糖反应
锁一钥匙模型 Substrate X Active site ES complex Enzyme