ENTRY       EC 2.7.7.28
NAME        Nucleoside-triphosphate--hexose-1-phosphate
            $ nucleotidyltransferase
            NDPhexose pyrophosphorylase
CLASS       Transferases
            Transferring phosphorus-containing groups
            Nucleotidyltransferases
SYSNAME     NTP:hexose-1-phosphate nucleotidyltransferase
REACTION    Nucleoside triphosphate + Hexose 1-phosphate = Pyrophosphate +
            NDPhexose
SUBSTRATE   Nucleoside triphosphate
            Hexose 1-phosphate
            GTP
            D-Glucose 1-phosphate
            D-Mannose 1-phosphate
PRODUCT     Pyrophosphate
            NDPhexose
            GDPglucose
            GDPmannose
COMMENT     In decreasing order of activity, guanosine, inosine and adenosine
            diphosphate hexoses are substrates in the reverse reaction with
            either glucose or mannose as the sugar.
DBLINKS     University of Geneva ENZYME DATA BANK: 2.7.7.28
            WIT (What Is There) Metabolic Reconstruction: 2.7.7.28
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