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Structure of mycobacterial maltokinase, the missing link in the essential GlgE-pathway

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Fraga, Joana, Maranha, Ana, Mendes, Vitor, Pereira, Pedro José Barbosa, Empadinhas, Nuno, Macedo-Ribeiro, Sandra·2015·Scientific Reports

Abstract

A novel four-step pathway identified recently in mycobacteria channels trehalose to glycogen synthesis and is also likely involved in the biosynthesis of two other crucial polymers: intracellular methylglucose lipopolysaccharides and exposed capsular glucan. The structures of three of the intervening enzymes - GlgB, GlgE and TreS - were recently reported, providing the first templates for rational drug design. Here we describe the structural characterization of the fourth enzyme of the pathway, mycobacterial maltokinase (Mak), uncovering a eukaryotic-like kinase (ELK) fold, similar to methylthioribose kinases and aminoglycoside phosphotransferases. The 1.15 Å structure of Mak in complex with a non-hydrolysable ATP analog reveals subtle structural rearrangements upon nucleotide binding in the cleft between the N- and the C-terminal lobes. Remarkably, this new family of ELKs has a novel N-terminal domain topologically resembling the cystatin family of protease inhibitors. By interfacing with and restraining the mobility of the phosphate-binding region of the N-terminal lobe, Mak's unusual N-terminal domain might regulate its phosphotransfer activity and represents the most likely anchoring point for TreS, the upstream enzyme in the pathway. By completing the gallery of atomic-detail models of an essential pathway, this structure opens new avenues for the rational design of alternative anti-tubercular compounds.

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Metadata

Authors
Fraga, J., Maranha, A., Mendes, V., Pereira, P. J. B., Empadinhas, N., & Macedo-Ribeiro, S.
Venue
Scientific Reports
Published
2015-01-26
Volume
5
Issue
1
Pages
8026-8026
ISSN
2045-2322 (ISSN-L)
OpenAlex
W1966729619
Cited by
819
References
46
FWCI
12.26
Type
journal article
Language
en
Open access
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CoChat. (2026). Citation check: Structure of mycobacterial maltokinase, the missing link in the essential GlgE-pathway. https://app.cochat.ai/papers/10.1038/srep08026
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Fraga, J., Maranha, A., Mendes, V., Pereira, P. J. B., Empadinhas, N., & Macedo-Ribeiro, S. (2015). Structure of mycobacterial maltokinase, the missing link in the essential GlgE-pathway. Scientific Reports. https://doi.org/10.1038/srep08026

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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