4.2.2.13: exo-(1->4)-alpha-D-glucan lyase

This is an abbreviated version!
For detailed information about exo-(1->4)-alpha-D-glucan lyase, go to the full flat file.

Word Map on EC 4.2.2.13

Reaction

[(1->4)-alpha-D-glucosyl]n+1
=
1,5-Anhydro-D-fructose
+
[(1->4)-alpha-D-glucosyl]n

Synonyms

alpha-(1,4)-Glucan 1,5-anhydro-D-fructose eliminase, alpha-1,4-Glucan exo-lyase, alpha-1,4-Glucan lyase, Dehydratase, alpha-1,4-glucan, Exo-alpha-1,4-glucan lyase, exo-(1,4)-alpha-D-glucan lyase, (1,4)-alpha-D-glucan exo-4-lyase (1,5-anhydro-D-fructose-forming), GLase, Ag111, alpha-1,4-glucan lyase isozyme 1

ECTree

     4 Lyases
         4.2 Carbon-oxygen lyases
             4.2.2 Acting on polysaccharides
                4.2.2.13 exo-(1->4)-alpha-D-glucan lyase

Systematic Name

Systematic Name on EC 4.2.2.13 - exo-(1->4)-alpha-D-glucan lyase

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SYSTEMATIC NAME
IUBMB Comments
(1->4)-alpha-D-glucan exo-4-lyase (1,5-anhydro-D-fructose-forming)
The enzyme catalyses 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. It does not degrade (1->6)-alpha-glucosidic 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 (aldos-2-ulose dehydratase), EC 4.2.1.111 (1,5-anhydro-D-fructose dehydratase) and EC 5.3.2.7 (ascopyrone tautomerase).