Aldos-2-ulose Dehydratase

Aldos-2-ulose dehydratase (, ''pyranosone dehydratase'', ''AUDH'', ''1,5-anhydro-D-fructose dehydratase (microthecin-forming)'') is an enzyme with systematic name ''1,5-anhydro-D-fructose hydro-lyase (microthecin-forming)''. This enzyme catalyses the following chemical reaction

: 1,5-anhydro-D-fructose $\rightleftharpoons$ 2-hydroxy-2-(hydroxymethyl)-2''H''-pyran-3(6''H'')-one + H₂O (overall reaction)
: (1a) 1,5-anhydro-D-fructose $\rightleftharpoons$ 1,5-anhydro-4-deoxy-D-''glycero''-hex-3-en-2-ulose + H₂O
: (1b) 1,5-anhydro-4-deoxy-D-''glycero''-hex-3-en-2-ulose $\rightleftharpoons$ 2-hydroxy-2-(hydroxymethyl)-2''H''-pyran-3(6''H'')-one

This enzyme catalyses two of the steps in the anhydrofructose pathway.

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EC 4.2.1