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Information on EC - aldos-2-ulose dehydratase

for references in articles please use BRENDA:EC4.2.1.110
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EC Tree
     4 Lyases
         4.2 Carbon-oxygen lyases
             4.2.1 Hydro-lyases
       aldos-2-ulose dehydratase
IUBMB Comments
This enzyme catalyses two of the steps in the anhydrofructose pathway, which leads to the degradation of glycogen and starch via 1,5-anhydro-D-fructose [1,2]. Aldose-2-uloses such as 2-dehydroglucose can also act as substrates, but more slowly [1,2,4]. This is a bifunctional enzyme that acts as both a lyase and as an isomerase . Differs from EC, which can carry out only reaction (1a), is inhibited by its product and requires metal ions for activity .
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
1,5-anhydro-D-fructose dehydratase (microthecin-forming), aldos-2-ulose dehydratase, aldos-2-ulose dehydratase/isomerase, aldosulose-utilizing enzyme, AUDH, pyranosone dehydratase, more
1,5-anhydro-4-deoxy-D-glycero-hex-3-en-2-ulose = 2-hydroxy-2-(hydroxymethyl)-2H-pyran-3(6H)-one
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; second of two consecutive reactions
1,5-anhydro-D-fructose = 1,5-anhydro-4-deoxy-D-glycero-hex-3-en-2-ulose + H2O
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; first of two consecutive reactions
1,5-anhydro-D-fructose = 2-hydroxy-2-(hydroxymethyl)-2H-pyran-3(6H)-one + H2O
show the reaction diagram
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