高等植物蚕豆的光合作用：V. 苹果酸作为三羧酸循环前体的作用
Photosynthesis in the Higher Plant Vicia faba: V. Role of Malate as a Precursor of the Tricarboxylic Acid Cycle.
作者信息
Kent S S
机构信息
Department of Botany and Range Science, Brigham Young University, Provo, Utah 84602.
出版信息
Plant Physiol. 1979 Jul;64(1):159-61. doi: 10.1104/pp.64.1.159.
Abstract
In the higher plant Vicia faba, anomalous labeling patterns in the organic acids and related amino acids of the tricarboxylic acid cycle which result from photosynthetic (14)CO(2) fixation (in conjunction with an enzyme localization pattern unique to plant mitochondria) suggest that the tricarboxylic acid cycle functions primarily as a pathway leading to glutamic acid biosynthesis during autotrophic growth. The distribution of isotope in citrate indicates little recycling of oxaloacetate for the resynthesis of citrate. Rather, malate appears to provide both the C(2) and C(4) fragments for the synthesis of citrate, and [(3)H]formate and (14)CO(2)-labeling patterns implicate serine as the ultimate C(3) precursor of malate.
摘要
在高等植物蚕豆中，光合（14）CO（2）固定（结合植物线粒体特有的酶定位模式）导致三羧酸循环的有机酸和相关氨基酸出现异常标记模式，这表明在自养生长过程中，三羧酸循环主要作为一条通向谷氨酸生物合成的途径发挥作用。柠檬酸盐中同位素的分布表明草酰乙酸很少循环用于柠檬酸盐的再合成。相反，苹果酸似乎为柠檬酸盐的合成提供了C（2）和C（4）片段，并且[（3）H]甲酸和（14）CO（2）标记模式表明丝氨酸是苹果酸最终的C（3）前体。
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