ID 4.1.2.47 DE (S)-hydroxynitrile lyase. AN (S)-cyanohydrin producing hydroxynitrile lyase. AN (S)-oxynitrilase. AN hydroxynitrile lyase. AN oxynitrilase. CA (1) a monosubstituted aliphatic (S)-hydroxynitrile = an aldehyde + CA hydrogen cyanide. CA (2) a disubstituted aliphatic (S)-hydroxynitrile = a ketone + hydrogen CA cyanide. CA (3) an aromatic (S)-hydroxynitrile = an aromatic aldehyde + hydrogen CA cyanide. CC -!- Hydroxynitrile lyases catalyzes the the cleavage of hydroxynitriles CC into cyanide and the corresponding aldehyde or ketone. CC -!- In nature the liberation of cyanide serves as a defense mechanism CC against herbivores and microbial attack in plants. CC -!- In vitro the enzymes from Manihot esculenta and Hevea brasiliensis CC accept a broad range of aliphatic and aromatic carbonyl compounds as CC substrates and catalyze the formation of (S)-hydroxynitriles. CC -!- Formerly EC 4.1.2.37 and EC 4.1.2.39. DR P52704, HNL_HEVBR ; P52705, HNL_MANES ; //