首页> 外文期刊>Canadian Journal of Pure and Applied Sciences >EFFECT OF A3[6]?GLU?LYS MUTATION ON REACTIVITY OF THE CYSF9[93]? SULPHYDRYL GROUP OF HUMAN HAEMOGLOBIN C
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EFFECT OF A3[6]?GLU?LYS MUTATION ON REACTIVITY OF THE CYSF9[93]? SULPHYDRYL GROUP OF HUMAN HAEMOGLOBIN C

机译:A3 [6]-谷氨酸裂解对CYSF9 [93]反应活性的影响人体血红蛋白C的磺基

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The pH dependence of the second order rate constant of the reaction of 5,5'-dithiobis(2-nitrobenzoate) (DTNB) with CysF9[93]β sulphydryl group of the oxy and carbonmonoxy derivatives of stripped haemoglobin C are complex while that of aquomet haemoglobins resembles the titration curve of a diprotic acid. However, in the presence of inositol hexakisphosphate, the profiles of oxy and carbomonoxy derivatives become simple while that of aquomet becomes bowl shaped. Increased ionic strength also simplified the complex profile. The pQs of the ionizable groups linked to the reactivity of DTNB with CysF9[93]β sulphydryl group range between 5.6 and 8.7 in stripped haemoglobin. The presence of inositol-P 6 decreases the pQ values to the range of 4.3 and 8.4. When compared with haemoglobins A and S, the reaction rate of heamoglobin C is lower than haemoglobin A but faster than haemoglobin S, implying that the net charge on the molecule has no direct relationship with the reaction rates.
机译:5,5'-二硫代双(2-硝基苯甲酸酯)(DTNB)与汽提的血红蛋白C的氧和一氧化碳衍生物的CysF9 [93]β巯基的反应的二级速率常数的pH依赖性很复杂,而对于水合液的血红蛋白类似于二质子酸的滴定曲线。然而,在肌醇六磷酸酯的存在下,氧和碳酰氧基衍生物的轮廓变得简单,而水合环的轮廓变得碗形。离子强度的提高也简化了复杂的轮廓。在脱去的血红蛋白中,与DTNB与CysF9 [93]β巯基的反应性相关的可电离基团的pQs在5.6和8.7之间。肌醇-P 6的存在将pQ值降低到4.3和8.4的范围。与血红蛋白A和S相比,血红蛋白C的反应速率低于血红蛋白A,但比血红蛋白S快,这意味着分子上的净电荷与反应速率没有直接关系。

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