Abstract
Glyoxalase I (GLO1), together with glyoxalase II and the co-factor GSH, comprise the glyoxalase system, which is responsible for the detoxification of the cytotoxic glycolytic-derived metabolite methylglyoxal (MG). We, and others, have previously reported that GLO1 is subjected to several post-translational modifications, including a NO-mediated modification and phosphorylation. In this study, we demonstrate that GLO1 is a substrate for calcium, calmodulin-dependent protein kinase II (CaMKII). Site-directed mutagenesis of several serine and threonine residues revealed that CaMKII induced phosphorylation of GLO1 at a single site Thr-106. Mutagenesis of Thr-106 to Ala in GLO1 completely abolished the CaMKII-mediated phosphorylation. A phosphopeptide bracketing phosphothreonine-106 in GLO1 was used as an antigen to generate polyclonal antibodies against phosphothreonine-106. By using this phospho-specific antibody, we demonstrated that TNF induces phosphorylation of GLO1 on Thr-106. Furthermore, we investigated the role of NO-mediated modification and phosphorylation of GLO1 in the TNF-induced transcriptional activity of NF-κB. Overexpression of WT GLO1 suppressed TNF-induced NF-κB-dependent reporter gene expression. Suppression of the basal and TNF-induced NF-κB activity was significantly stronger upon expression of a GLO1 mutant that was either deficient for the NO-mediated modification or phosphorylation on Thr-106. However, upon overexpression of a GLO1 mutant that was deficient for both types of modification, the suppressive effect of GLO1 on TNF-induced NF-κB activity was completely abolished. These results suggest that NO-modification and phosphorylation of GLO1 contribute to the suppression of TNF-induced NF-κB-dependent reporter gene expression. In line with this, knock-down of GLO1 by siRNA significantly increased TNF-induced NF-κB-dependent reporter gene expression. These findings suggest that phosphorylation and NO-modification of glyoxalase I provides another control mechanism for modulating the basal and TNF-induced expression of NF-kappaB-responsive genes.
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Abbreviations
- 2-DE:
-
2-Dimensional gel electrophoresis
- GLO1:
-
Glyoxalase I
- MG:
-
Methylglyoxal
- TNF:
-
Tumour necrosis factor
- GSNO:
-
S-nitrosogluthathione
- IEF:
-
Isoelectro focusing
- CaM:
-
Calmodulin
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de Hemptinne, V., Rondas, D., Toepoel, M. et al. Phosphorylation on Thr-106 and NO-modification of glyoxalase I suppress the TNF-induced transcriptional activity of NF-κB. Mol Cell Biochem 325, 169–178 (2009). https://doi.org/10.1007/s11010-009-0031-7
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DOI: https://doi.org/10.1007/s11010-009-0031-7