ArticleThe FEBS journal2025
Deciphering the tight metabolite-level regulation of glucose-1-phosphate adenylyltransferase (GlgC) for glycogen synthesis in cyanobacteria.
Article in The FEBS journal, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Glycogen deficiency impairs diurnal energy metabolism and cell division in Synechocystis.Plant physiology · 2026Article
- A peripheral carboxysome component regulates cyanobacterial glycogen deposition.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803.FEBS letters · 2026Article
- Conversion of COMicrobial cell factories · 2026Article
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4 authors.
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Abstract
The enzyme glucose-1-phosphate adenylyltransferase (GlgC, EC:2.7.7.27) catalyses the first step in glycogen synthesis by converting glucose-1-phosphate into ADP-glucose, which is added in turn to a growing glycogen chain by glycogen synthases. Thus far, in vitro studies of GlgC were mainly performed using colorimetric or radiolabel-based phosphate release assays, limiting the option for analysing this reaction. With this work, we present a novel in vitro continuous assay coupling the subsequent glycogen synthase reaction to the GlgC reaction, thus simulating the process of glycogen synthesis in vivo. Using this assay, we revisited GlgC catalytic parameters and screened for metabolites that affect GlgC activity in Synechocystis sp. PCC 6803. We also describe in further detail the antagonistic interplay between the GlgC activator, 3-PGA and the inhibitor, inorganic phosphate, revealing the intricate mechanism by which glycogen formation responds to fluctuations in carbon and energy supply in cyanobacteria.
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