Glycogen and Starch

P. J. Roach, S. C. Zeeman

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Scopus citations


Glycogen and starch are the two major storage forms of glucose in nature. Both are large glucose polymers formed by α-1,4-glycosidic linkages with branch points introduced by α-1,6-glycosidic linkages. Both are synthesized when conditions are nutritionally or energetically favorable for later use. The structures of glycogen and starch differ greatly. Glycogen has uniform branching, a minimal number of enzymes mediating its metabolism, and is cytosolic. Starch usually accumulates in specialized organelles, its major constituent amylopectin has nonuniform branching that allows highly organized, crystalline regions, and is metabolized by a complex set of enzymes and isoenzymes.

Original languageEnglish (US)
Title of host publicationMolecular Cell Biology
PublisherElsevier Inc.
Number of pages8
ISBN (Electronic)9780123944474
ISBN (Print)9780123947963
StatePublished - Jan 1 2016


  • Amylopectin
  • Amyloplast
  • Amylose
  • Branching enzyme
  • Chloroplast
  • Debranching enzyme
  • Dikinase
  • Glucan phosphatase
  • Glycogen
  • Glycogenin
  • Glycosidic linkage
  • Lafora disease
  • Laforin
  • Phosphorylation
  • Starch

ASJC Scopus subject areas

  • Medicine(all)

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  • Cite this

    Roach, P. J., & Zeeman, S. C. (2016). Glycogen and Starch. In Molecular Cell Biology (Vol. 1, pp. 263-270). Elsevier Inc..