The enzyme Glucosaminate ammonia-lyase (EC 4.3.1.9) catalyzes the chemical reaction

2-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)

This enzyme belongs to the family of lyases, specifically ammonia lyases, which cleave carbon-nitrogen bonds. The systematic name of this enzyme class is 2-amino-2-deoxy-D-gluconate ammonia-lyase (isomerizing; 2-dehydro-3-deoxy-D-gluconate-forming). Other names in common use include glucosaminic dehydrase, D-glucosaminate dehydratase, D-glucosaminic acid dehydrase, aminodeoxygluconate dehydratase, 2-amino-2-deoxy-D-gluconate hydro-lyase (deaminating), aminodeoxygluconate ammonia-lyase, 2-amino-2-deoxy-D-gluconate ammonia-lyase, and D-glucosaminate ammonia-lyase. This enzyme participates in the pentose phosphate pathway. It employs one cofactor, pyridoxal phosphate.

• Imanaga Y (1958). "Metabolism of D-glucosamine. III. Enzymic degradation of D-glucosaminic acid". J. Biochem. 45. Tokyo: 647–650. doi:10.1093/oxfordjournals.jbchem.a126909.
• Merrick JM; Roseman S (1966). "D-Glucosaminic acid dehydrase". Carbohydrate Metabolism. Methods in Enzymology. Vol. 9. pp. 657–660. doi:10.1016/0076-6879(66)09133-X. ISBN 978-0-12-181809-8.
• Iwamoto R, Imanaga Y, Soda K (Jan 1982). "D-Glucosaminate dehydratase from Agrobacterium radiobacter Physicochemical and enzymological properties". J. Biochem. 91 (1). Tokyo: 283–9. doi:10.1093/oxfordjournals.jbchem.a133686. PMID 7068563.
• Iwamoto R, Taniki H, Koishi J, Nakura S (1995). "D-glucosaminate aldolase activity of D-glucosaminate dehydratase from Pseudomonas fluorescens and its requirement for Mn²⁺ ion". Biosci. Biotechnol. Biochem. 59 (3): 408–11. doi:10.1271/bbb.59.408. PMID 7766176.

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