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线粒体复合体Ⅳ，又称细胞色素C氧化酶（COX），是线粒体呼吸电子传递链的末端酶，也是主呼吸链与支路（如替代氧化酶途径）的共有成分。它负责催化还原型细胞色素C（Cyt c²⁺）氧化为氧化型细胞色素C（Cyt c³⁺），并将电子最终传递给氧，生成水，在细胞能量代谢中发挥关键作用。本试剂盒的测定原理为：还原型细胞色素C在550 nm处具有特征吸收峰，线粒体复合体Ⅳ催化其氧化生成氧化型细胞色素C（无此特征吸收），导致550 nm处吸光度下降。通过测定550 nm处吸光度的下降速率，即可定量计算线粒体复合体Ⅳ的酶活性。
Mitochondrial complex IV, also known as cytochrome c oxidase (COX), is the terminal enzyme of the mitochondrial respiratory electron transport chain and is a common component shared by both the main respiratory chain and branch pathways (such as the alternative oxidase pathway). It catalyzes the oxidation of reduced cytochrome c (Cyt c²⁺) to oxidized cytochrome c (Cyt c³⁺), and transfers electrons ultimately to oxygen to form water, playing a critical role in cellular energy metabolism. The assay principle of this kit is as follows: Reduced cytochrome c exhibits a characteristic absorption peak at 550 nm. Mitochondrial complex IV catalyzes its oxidation to oxidized cytochrome c (which lacks this characteristic absorption), resulting in a decrease in absorbance at 550 nm. By measuring the rate of decrease in absorbance at 550 nm, the mitochondrial complex IV enzyme activity can be quantitatively calculated.
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