Glycogen Metabolism

  • Instructor: Bettina Haas
  • Lectures: 8
  • Students: 1939
  • Duration: 10 weeks

Glycogen, a highly branched glucose polymer, is formed and broken down in most human tissues, but is most abundant in liver and muscle, where it serves as a major stored fuel. Glycogen metabolism has been studied in most detail in liver and skeletal muscle. Glycogen metabolism in other tissues has not been studied as extensively, and is thought to resemble the muscle process.Glycogen synthesis involves five reactions. The first two, conversion of glucose 6-phosphate to glucose 1-phosphate and synthesis of UDP-glucose from glucose 1-phosphate and UTP, are shared with several other pathways. The next three reactions, the auto-catalyzed synthesis of a glucose oligomer on glycogenin, the linear extension of the glucose oligomer catalyzed by glycogen synthase, and the formation of branches catalyzed by glycogen branching enzyme, are unique to glycogen synthesis. Repetition of the last two reactions generates large, extensively branched glycogen polymers. The catalysis of glycogenin glucosylation and oligoglucose chain extension by distinct isozymes in liver and nonhepatic tissues allows them to be regulated independently (Agius 2008; Bollen et al. 1998; Roach et al. 2012).Cytosolic glycogen breakdown occurs via the same chemical steps in all tissues but is separately regulated via tissue specific isozymes and signaling pathways that enable distinct physiological fates for glycogen in liver and other tissues.


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  • Overview of Glycogen Structure and Metabolism 0/1

  • Glycogen Structure 0/1

  • Glycogen Synthesis 0/1

  • Glycogen Degradation 0/1

  • Lysosomal Degradation of Glycogen 0/1

  • Regulation of Glycogen Degradation 0/1

  • Regulation of Glycogen Synthesis 0/1

  • Completion of Course 0/1