Acireductone synthase (EC number 3.1.3.77, E1, E-1 enolase-phosphatase) is an enzyme with systematic name 5-(methylsulfanyl)-2,3-dioxopentyl-phosphate phosphohydrolase (isomerizing). It catalyses the following reaction:
5-(methylsulfanyl)-2,3-dioxopentyl phosphate + H<sub>2</sub>O = 1,2-dihydroxy-5-(methylsulfanyl)pent-1-en-3-one + phosphate (overall reaction)
:(1a) 5-(methylsulfanyl)-2,3-dioxopentyl phosphate = 2-hydroxy-5-(methylsulfanyl)-3-oxopent-1-enyl phosphate (probably spontaneous)
:(1b) 2-hydroxy-5-(methylsulfanyl)-3-oxopent-1-enyl phosphate + H<sub>2</sub>O = 1,2-dihydroxy-5-(methylsulfanyl)pent-1-en-3-one + phosphate
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