Brinkworth R I, Masters C J, Winzor D J
Biochem J. 1975 Dec;151(3):631-6. doi: 10.1042/bj1510631.
Rabbit muscle lactate dehydrogenase was subjected to frontal affinity chromatography on Sepharose-oxamate in the presence of various concentrations of NADH and sodium phosphate buffer (0.05 M, pH 6.8) containing 0.5 M-NaCl. Quantitative interpretation of the results yields an intrinsic association constant of 9.0 x 10 (4)M-1 for the interaction of enzyme with NADH at 5 degrees C, a value that is confirmed by equilibrium-binding measurements. In a second series of experiments, zonal affinity chromatography of a mouse tissue extract under the same conditions was used to evaluate assoication constants of the order 2 x 10(5)M-1, 3 x 10(5)M-1, 4 x 10(5)M-1, 7 x 10(5)M-1 and 2 x 10(6)M-1 for the interaction of NADH with the M4, M3H, M2H2, MH3 and H4 isoenzymes respectively of lactate dehydrogenase.
在含有0.5M氯化钠的不同浓度的NADH和0.05M磷酸钠缓冲液(pH6.8)存在的条件下,将兔肌肉乳酸脱氢酶进行Sepharose-草氨酸盐前沿亲和层析。对结果的定量解释得出,在5℃时酶与NADH相互作用的固有缔合常数为9.0×10⁴M⁻¹,该值通过平衡结合测量得到证实。在第二系列实验中,在相同条件下对小鼠组织提取物进行区带亲和层析,以评估NADH与乳酸脱氢酶的M4、M3H、M2H2、MH3和H4同工酶相互作用的缔合常数,分别为2×10⁵M⁻¹、3×10⁵M⁻¹、4×10⁵M⁻¹、7×10⁵M⁻¹和2×10⁶M⁻¹。