ID 4.1.2.46 DE aliphatic (R)-hydroxynitrile lyase. AN (R)-hydroxynitrile lyase. AN (R)-oxynitrilase. CA (2R)-2-hydroxy-2-methylbutanenitrile = butan-2-one + hydrogen cyanide. CC -!- The enzyme catalyzes the stereoselective synthesis of aliphatic (R)- CC cyanohydrins. CC -!- No activity toward mandelonitrile and 4-hydroxymandelonitrile. CC -!- Natural substrates for the (R)-oxynitrilase from Linum usitatissimum CC are acetone and butan-2-one, which are the building blocks of the CC cyanogen glycosides in Linum, linamarin and lotaustralin, CC or linustatin and neolinustatin, respectively. CC -!- Formerly EC 4.1.2.37 and EC 4.1.2.39. DR P93243, AHNL_LINUS ; //