蟹类肌肉纤维中磷化合物的周转
The turnover of phosphorus compounds in crab muscle fibres.
作者信息
Caldwell P C, Walster G E
出版信息
J Physiol. 1975 Jun;248(1):1-13. doi: 10.1113/jphysiol.1975.sp010959.
Abstract
- The exchange of 32P injected into single crab muscle fibres as either orthophosphate or ATP has been studied. The results have been analysed in terms of a simple kinetic model. 2. The exchange of 32P between ATP and arginine phosphate is considerably faster than that between ATP and orthophosphate during rest and during contraction in caffeine. 3. The rate constants obtained at rest after the injection of either orthophosphate or ATP labelled with 32P were of the same order. They were also of the same order as those which have been obtained previously for squid axons. 4. The exchange during caffeine contraction of 32P unjected as orthophosphate gave rate constants which were consistent with an increased rate of splitting of ATP and with the rate constants needed to account for the observed net formation of orthophosphate. The results obtained after the injection of 32P-labelled ATP during caffeine contraction were less clear cut.
摘要
- 对注入单根蟹肌纤维中的32P（以正磷酸盐或ATP形式）的交换进行了研究。已根据一个简单的动力学模型对结果进行了分析。2. 在静息状态和咖啡因收缩过程中，ATP与磷酸精氨酸之间的32P交换比ATP与正磷酸盐之间的交换快得多。3. 注入用32P标记的正磷酸盐或ATP后在静息状态下获得的速率常数处于同一量级。它们也与先前在枪乌贼轴突中获得的速率常数处于同一量级。4. 在咖啡因收缩过程中以正磷酸盐形式注入的32P的交换给出的速率常数与ATP分解速率的增加以及解释观察到的正磷酸盐净形成所需的速率常数一致。在咖啡因收缩过程中注入32P标记的ATP后获得的结果不太明确。
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