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2019年3月7日 · Ks是酶与底物复合物的解离常数，定义为Ks=k-1/k1。1/Ks是反映酶与底物亲和力的参数。因为当k2极小时Km就近似等于Ks，所以说1/Km可近似表示酶与底物的亲和力，1/Km越大，亲和力越大。解离常数在研究两个分子结合的时候经常写作Kd。

2019年2月2日 · Two commonly encountered parameters in enzyme kinetics are the Michaelis constant (Km) and the dissociation constant (Kd), both report aspects of a substrate’s binding behavior. In this article, I clarify these terms' definitions, differences and biochemical significance .

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Km和Ks Km是米氏常数，定义为Km= (k-1+k2)/k1，物理意义是反应速度达到Vm一半时的底物浓度。 Ks是酶与底物复合物的解离常数，定义为Ks=k-1/k1。 1/Ks是…

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Ks称为底物常数,Ks=K2/K1,它是ES的解离常数,只反映ES解离趋势,因此,1/Ks可以表示酶与底物的亲和力大小(ES形成趋势),不难看出,底物亲和力大不一定反应速度大(产物形成趋势,K3/K1) 只有当K2、K1>>K3时,Km≈Ks,因此,1/Km只能近似地表示底物亲和力的大小。