glycogen granule
A microbial carbohydrate storage inclusion in which glycogen polymer accumulates as cytoplasmic granules that store glucose-derived carbon and energy for later mobilization. [DOI:10.3389/fmicb.2016.00966]
Components
| Component | Type | Part of / acts on | Grounding | Genes | Stoichiometry | Essential | Role |
|---|---|---|---|---|---|---|---|
| glycogen | Small molecule | part of | CHEBI:28087 | ESSENTIAL | Branched glucose storage polymer that condenses into the granule and supplies carbon and energy during subsequent mobilization.
|
Taxonomic distribution
NCBITaxon:2Bacteria — VARIABLE: Glycogen storage granules occur in cyanobacteria and other glycogen-producing bacteria but are absent from bacterial lineages that lack bacterial glycogen biosynthesis. [DOI:10.3389/fmicb.2016.00966]
Canonical examples
NCBITaxon:1148Synechocystis sp. PCC 6803 — Unicellular cyanobacterium used to analyze glycogen granule formation during macronutrient starvation. [DOI:10.3389/fmicb.2016.00966]
Functions
- glycogen carbon and energy storage — Glycogen granules sequester glucose-derived carbon and energy as branched glycogen polymer that can be degraded when external nutrients limit growth.
DOI:10.3389/fmicb.2016.00966Koch et al. 2016 review glycogen as a common microbial carbon polymer that accumulates in Synechocystis during macronutrient starvation.
Mechanism graphs
Glycogen polymer forms carbon-storage granules (ASSEMBLY)
Branched glycogen polymer accumulates as cytoplasmic granules that hold glucose-derived carbon and energy for later mobilization.
| Subject | Predicate | Object | Evidence |
|---|---|---|---|
| glycogen | accumulates as | glycogen granule |
|
| glycogen granule | stores | stored glucose-derived carbon and energy |
|
Evidence
DOI:10.3389/fmicb.2016.00966Koch et al. 2016, The Multiple Functions of Common Microbial Carbon Polymers, Frontiers in Microbiology.
Curation history
2026-09-10T09:53:47Zclaude · CREATED_RECORD — Scaffolded by scripts/new_record.py2026-09-10T09:54:12Zclaude · EXPANDED_RECORD — Added the ChEBI-grounded glycogen core, bacterial taxonomic scope, a Synechocystis sp. PCC 6803 canonical example, a glycogen carbon and energy storage function, record-level evidence and a nonmechanistic glycogen storage graph.2026-09-10T10:07:18Zclaude · EDITED_RECORD — Changed the glycogen storage function from cyanobacterium-specific photosynthetically fixed carbon wording to taxon-neutral glucose-derived carbon and energy wording.