The enzyme Glucosaminate ammonia-lyase (EC 4.3.1.9) catalyzes the chemical reaction2-amino-2-deoxy-D-gluconate = 2-dehydro-3-deoxy-D-gluconate + NH3 (overall reaction) (1a) 2-amino-2-deoxy-Dgluconate = (2Z,4S,5R)-2-amino-4,5,6-trihydroxyhex-2-enoate + H2O (1b) (2Z,4S,5R)-2-amino-4,5,6-trihydroxyhex-2-enoate = (4S,5R)-4,5,6-trihydroxy-2-iminohexanoate (spontaneous) (1c) (4S,5R)-4,5,6-trihydroxy-2-iminohexanoate + H2O = 2-dehydro-3-deoxyD-gluconate + NH3 (spontaneous)