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Open AccessArticle

Enzymatic Properties of Recombinant Phospho-Mimetic Photorespiratory Glycolate Oxidases from Arabidopsis thaliana and Zea mays

Institute of Plant Sciences Paris-Saclay, CNRS, Université Paris-Sud, INRA, Université d’Evry, Université Paris-Diderot, Université Paris-Saclay, 91405 Orsay CEDEX, France
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Author to whom correspondence should be addressed.
Plants 2020, 9(1), 27; https://doi.org/10.3390/plants9010027
Received: 22 November 2019 / Revised: 19 December 2019 / Accepted: 21 December 2019 / Published: 24 December 2019
(This article belongs to the Special Issue Regulation of Central Carbon and Amino Acid Metabolism in Plants)
In photosynthetic organisms, the photorespiratory cycle is an essential pathway leading to the recycling of 2-phosphoglycolate, produced by the oxygenase activity of ribulose-1,5-bisphosphate carboxylase/oxygenase, to 3-phosphoglycerate. Although photorespiration is a widely studied process, its regulation remains poorly understood. In this context, phosphoproteomics studies have detected six phosphorylation sites associated with photorespiratory glycolate oxidases from Arabidopsis thaliana (AtGOX1 and AtGOX2). Phosphorylation sites at T4, T158, S212 and T265 were selected and studied using Arabidopsis and maize recombinant glycolate oxidase (GOX) proteins mutated to produce either phospho-dead or phospho-mimetic enzymes in order to compare their kinetic parameters. Phospho-mimetic mutations (T4D, T158D and T265D) led to a severe inhibition of GOX activity without altering the KM glycolate. In two cases (T4D and T158D), this was associated with the loss of the cofactor, flavin mononucleotide. Phospho-dead versions exhibited different modifications according to the phospho-site and/or the GOX mutated. Indeed, all T4V and T265A enzymes had kinetic parameters similar to wild-type GOX and all T158V proteins showed low activities while S212A and S212D mutations had no effect on AtGOX1 activity and AtGOX2/ZmGO1 activities were 50% reduced. Taken together, our results suggest that GOX phosphorylation has the potential to modulate GOX activity. View Full-Text
Keywords: Arabidopsis thaliana; glycolate oxidase; photorespiration; protein phosphorylation; Zea mays Arabidopsis thaliana; glycolate oxidase; photorespiration; protein phosphorylation; Zea mays
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Jossier, M.; Liu, Y.; Massot, S.; Hodges, M. Enzymatic Properties of Recombinant Phospho-Mimetic Photorespiratory Glycolate Oxidases from Arabidopsis thaliana and Zea mays. Plants 2020, 9, 27.

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