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)-2H-pyran-3(6H)-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)-2H-pyran-3(6H)-one

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