Changes in the kinetic properties and phosphorylation state of phosphoenolpyruvate carboxylase in Zea mays leaves in reponse to light and dark

FEBS Letters

Nimmo, Gillian A.¹  Wilkins, Malcolm B.²  Nimmo, Hugh G.¹  McNaughton, Gavin A.L.¹  Fewson, Charles A.¹ 

[1] Department of Biochemistry, University of Glasgow, Glasgow G12 8QQ, Scotland;Department of Botany, University of Glasgow, Glasgow G12 8QQ, Scotland

关键词: C4 photosynthesis;    Light/dark regulation;    Phosphorylation;    Phosphoenolpyruvate carboxylase;    Malate inhibition;    (Zea mays);   

DOI  :  10.1016/0014-5793(87)81457-6

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

In plants such as Zea mays that carry out C₄ metabolism, phosphoenolpyruvate carboxylase catalyses the primary fixation of atmospheric CO₂. The properties of this enzyme from Z. mays leaves kept in light and in darkness are different. In brightly illuminated leaves, which are actively fixing CO₂, the enzyme is less sensitive to feedback inhibition by malate and is phosphorylated on one or more serine residues. In darkened leaves, which are not photosynthesising, the enzyme is more sensitive to inhibition by malate and is much less phosphorylated. This indicates that the activity of the enzyme is controlled by a reversible phosphorylation.

【 授权许可】

Unknown