Studies of the phosphorylation of Escherichia coli isocitrate dehydrogenase. Recognition of the enzyme by isocitrate dehydrogenase kinase/phosphatase and effects of phosphorylation on its structure and properties

McKee, J. S., Hlodan, R. and Nimmo, H. G. (1989) Studies of the phosphorylation of Escherichia coli isocitrate dehydrogenase. Recognition of the enzyme by isocitrate dehydrogenase kinase/phosphatase and effects of phosphorylation on its structure and properties. Biochimie, 71(9-10), pp. 1059-1064. (doi:10.1016/0300-9084(89)90111-9) (PMID:2557094)

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Abstract

Escherichia coli isocitrate dehydrogenase is completely inactivated by phosphorylation of a single serine residue per subunit. We have examined the conformations of the active and phosphorylated forms of the enzyme using circular dichroism spectroscopy. The results support the view that phosphorylation prevents the binding of NADP, probably by direct blocking of the coenzyme-binding site. Labelling studies suggest that an arginine residue at the coenzyme-binding site may be close to the phosphorylatable serine residue. The phosphorylation of isocitrate dehydrogenase is thus unusual in that it occurs at the active site of the enzyme. We therefore investigated the recognition of isocitrate dehydrogenase by isocitrate dehydrogenase kinase/phosphatase. The kinase activity of this enzyme can phosphorylate intact isocitrate dehydrogenase but not proteolytic fragments derived from it, nor a synthetic peptide corresponding to the sequence round the phosphorylation site.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Nimmo, Professor Hugh
Authors: McKee, J. S., Hlodan, R., and Nimmo, H. G.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Biochimie
Publisher:Elsevier
ISSN:0300-9084
ISSN (Online):1638-6183

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