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SugarP_isomerase: Sugar Phosphate Isomerase family; includes type A ribose 5-phosphate isomerase (RPI_A), glucosamine-6-phosphate (GlcN6P) deaminase, and 6-phosphogluconolactonase (6PGL). RPI catalyzes the reversible conversion of ribose-5-phosphate to ribulose 5-phosphate, the first step of the non-oxidative branch of the pentose phosphate pathway. GlcN6P deaminase catalyzes the reversible conversion of GlcN6P to D-fructose-6-phosphate (Fru6P) and ammonium, the last step of the metabolic pathway of N-acetyl-D-glucosamine-6-phosphate. 6PGL converts 6-phosphoglucono-1,5-lactone to 6-phosphogluconate, the second step of the oxidative phase of the pentose phosphate pathway.
Jiyao W et al.(2023). "The conserved domain database in 2023.",