胡萝卜根组织衰老过程中呼吸作用的糖酵解调控
Glycolytic control of respiration during aging of carrot root tissue.
作者信息
Adams P B, Rowan K S
出版信息
Plant Physiol. 1970 Apr;45(4):490-4. doi: 10.1104/pp.45.4.490.
Abstract
Changes in respiration in aging carrot slices are correlated with a characteristic sequence of activation of the irreversible reactions of the glycolytic pathway. The induced "wound" respiration increases in two stages; these appear to correspond to a period of active synthesis, when ADP, produced in the cytoplasm from synthetic reactions, activates pyruvate kinase, and a period of readjustment when ATP, no longer reacting in synthetic reactions, activates phosphofructokinase. Although ATP is cited frequently as a negative effector of phosphofructokinase, unless the concentration of ATP at the site of phosphofructokinase is 50-fold higher than the concentration expressed per unit fresh weight of the tissue, it cannot act in this way in carrot slices. The activation of the oxidative pentose phosphate pathway observed by ap Rees and Beevers is restricted to the first stage of the induced respiration.
摘要
衰老胡萝卜切片呼吸作用的变化与糖酵解途径不可逆反应激活的特定序列相关。诱导的“创伤”呼吸作用分两个阶段增加；这两个阶段似乎分别对应一个活跃合成期，此时细胞质中由合成反应产生的ADP激活丙酮酸激酶，以及一个调整期，此时不再参与合成反应的ATP激活磷酸果糖激酶。尽管ATP常被视为磷酸果糖激酶的负效应物，但除非磷酸果糖激酶位点处的ATP浓度比以组织单位鲜重表示的浓度高50倍，否则它在胡萝卜切片中不会以这种方式起作用。阿普·里斯和比弗斯观察到的氧化戊糖磷酸途径的激活仅限于诱导呼吸的第一阶段。
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