fumarate hydratase activity (S)-malate hydro-lyase activity KEGG_REACTION:R01082 RHEA:12460 L-malate hydro-lyase activity Catalysis of the reaction: (S)-malate = fumarate + H2O. EC:4.2.1.2 Reactome:R-HSA-70982 MetaCyc:FUMHYDR-RXN fumarase activity GO:0004333 (S)-malate hydro-lyase (fumarate-forming) hydro-lyase activity