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ENZYME entry: EC 4.2.2.13

Accepted Name
Exo-(1->4)-alpha-D-glucan lyase.
Alternative Name(s)
Alpha-1,4-glucan 1,5-anhydro-D-fructose eliminase.
Alpha-1,4-glucan exo-lyase.
Alpha-1,4-glucan lyase.
Exo-(1,4)-alpha-D-glucan lyase.
Exo-alpha-1,4-glucan lyase.
Reaction catalysed
Linear alpha-glucan <=> (n-1) 1,5-anhydro-D-fructose + D-glucose
Comment(s)
  • Catalyzes the sequential degradation of (1->4)-alpha-D-glucans from the non-reducing end with the release of 1,5-anhydro-D-fructose.
  • Thus, for an alpha-glucan containing n (1->4)-linked glucose units, the final products are 1 glucose plus (n-1) 1,5-anhydro-D-fructose.
  • Maltose, maltosaccharides and amylose are all completely degraded.
  • Does not degrade (1->6)-alpha-gucosidic bonds and thus the degradation of a branched glucan, such as amylopectin or glycogen, will result in the formation of 1,5-anhydro-D-fructose plus a limit dextrin.
  • Other enzymes involved in the anhydrofructose pathway are EC 4.2.1.110, EC 4.2.1.111 and EC 5.3.2.7.
Cross-references
BRENDA4.2.2.13
EC2PDB4.2.2.13
ExplorEnz4.2.2.13
PRIAM enzyme-specific profiles4.2.2.13
KEGG Ligand Database for Enzyme Nomenclature4.2.2.13
IUBMB Enzyme Nomenclature4.2.2.13
IntEnz4.2.2.13
MEDLINEFind literature relating to 4.2.2.13
MetaCyc4.2.2.13
Rhea expert-curated reactions4.2.2.13

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All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 4.2.2.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 4.2.-.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 4.-.-.-