Chemicals and Drugs

Glycogen Phosphorylase

An enzyme that catalyzes the degradation of GLYCOGEN in animals by releasing glucose-1-phosphate from the terminal alpha-1,4-glycosidic bond. This enzyme exists in two forms: an active phosphorylated form ( PHOSPHORYLASE A) and an inactive un-phosphorylated form (PHOSPHORYLASE B). Both a and b forms of phosphorylase exist as homodimers. In mammals, the major isozymes of glycogen phosphorylase are found in muscle, liver and brain tissue.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

An enzyme that catalyzes the degradation of GLYCOGEN in animals by releasing glucose-1-phosphate from the terminal alpha-1,4-glycosidic bond. This enzyme exists in two forms: an active phosphorylated form ( PHOSPHORYLASE A) and an inactive un-phosphorylated form (PHOSPHORYLASE B). Both a and b forms of phosphorylase exist as homodimers. In mammals, the major isozymes of glycogen phosphorylase are found in muscle, liver and brain tissue.

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Classification

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MeSH Record

Synonyms

2 entry terms
  • Phosphorylase ab
  • Phosphorylase, Glycogen

MeSH Record

Aspects Covered

29 allowable subheadings

Indexed with the subheadings administration & dosage, adverse effects, analysis, antagonists & inhibitors, biosynthesis, blood, cerebrospinal fluid, chemical synthesis, chemistry, classification, deficiency, drug effects, economics, genetics, history, immunology, isolation & purification, metabolism, pharmacokinetics, pharmacology, physiology, poisoning, radiation effects, standards, supply & distribution, therapeutic use, toxicity, ultrastructure, urine.

MeSH Record

Indexing Annotation

general or unspecified; prefer specifics

MeSH Record

History Note

2002

MeSH Record

Previous Indexing

  • Glucosyltransferases (1965-1971)
  • Phosphorylases (1972-2001)

MeSH Hierarchy

Tree Number

AMA Style

References

  1. National Library of Medicine. Glycogen Phosphorylase. Medical Subject Headings (MeSH). 2026. Unique ID D024981. http://id.nlm.nih.gov/mesh/2026/D024981
  2. Glycogen Phosphorylase. In: Wikipedia. https://en.wikipedia.org/wiki/Glycogen_phosphorylase
  3. Glycogen Phosphorylase. In: Wikidata. https://www.wikidata.org/wiki/Q412061