Light/Dark-Regulation of C4-Photosynthesis Enzymes by Covalent Phosphorylation

光合作用的一些酶只有在光中才活跃，而另一些酶只有在黑暗中才活跃。这种光/暗调节在决定玉米等重要作物的植株生产力方面非常重要。在研究这一规律时，Chollet博士发现，玉米叶片中一种关键的光调节酶--丙酮酸磷酸二激酶--似乎有两种不同的酶活性。如果得到证实，这将是耐人寻味的，并为酶调节开辟了许多新的可能性。这一作用为植物酶的纯化研究和其他生化研究提供了资金，以确定磷酸化在光/暗调节中的作用。

Some enzymes of photosynthesis are active only in the light and others, only in the dark. This light/dark regulation is very important in determining plant productivity in important crop plants like maize. In studying this regulation, Dr. Chollet has discovered that a crucial light-regulated enzyme in corn leaves, pyruvate phosphate dikinase, appears to have two different enzyme activities. If substantiated, this would be intriguing and open up many new possibilities for enzyme regulation. This action funds purification studies of the plant enzyme and other biochemical studies to determine the role of phosphorylation in light/dark regulation.