1887

Abstract

Glycogen, a large α-glucan, is a ubiquitous energy storage molecule among bacteria, and its biosynthesis by the classical GlgC-GlgA pathway and its degradation have long been well understood – or so we thought. A second pathway of α-glucan synthesis, the four-step GlgE pathway, was recently discovered in mycobacteria. It requires trehalose as a precursor, and has been genetically validated as a novel anti-tuberculosis drug target. The ability to convert glycogen into trehalose was already known, so the GlgE pathway provides a complementary way of cycling these two metabolites. As well as containing cytosolic storage glycogen, mycobacteria possess an outer capsule containing a glycogen-like α-glucan that is implicated in immune system evasion, so the GlgE pathway might be linked to capsular α-glucan biosynthesis. Another pathway (the Rv3032 pathway) for α-glucan biosynthesis in mycobacteria generates a methylglucose lipopolysaccharide thought to be associated with fatty acid metabolism. A comparative genomic analysis was carried out to evaluate the occurrence and role of the classical pathway, the new GlgE pathway and the Rv3032 pathway across bacteria occupying very different ecological niches. The GlgE pathway is represented in 14 % of sequenced genomes from diverse bacteria (about half as common as the classical pathway), while the Rv3032 pathway is restricted with few exceptions to mycobacteria, and the GlgB branching enzyme, usually presumed to be associated with the classical pathway, correlates more strongly with the new GlgE pathway. The microbiological implications of recent discoveries in the light of the comparative genomic analysis are discussed.

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2011-06-01
2019-10-15
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(including Supplementary Table S1, Genes used in the reciprocal BLAST searches) [ PDF] (11 kb) Presence of glucan-related genes within sequenced microbial genomes [ PDF] (1021 kb)

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(including Supplementary Table S1, Genes used in the reciprocal BLAST searches) [ PDF] (11 kb) Presence of glucan-related genes within sequenced microbial genomes [ PDF] (1021 kb)

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