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Reaction 1
- -D-galactose converted to D-galactose 1-phosphate
- -galactokinase(enzyme)
- -irreversible reaction
- -ATP required
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Reaction 2
- -start with D-galactose 1-phosphate and UDP glucose(uradine diphosphate covalently bonded to glucose)
- -irreversible reaction
- -uridylyltransferase is enzyme, transfers UDP to galactose sugar and phosphate from galactose to glucose
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Reaction 3
- -starts with UDP-D-galactose
- -uses enzyme 4-epimerase
- -reversible reaction
- -product is UDP-D-glucose
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Reaction 4
- -starts with UDP-D-glucose and inorganic pyrophosphate
- -uses enzyme UDP-glucose pyrophosphorylase
- -products are UTP (uradil triphosphate) and D-glucose 1-phosphate
- -reversible reaction
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Reaction 5
- -starts with D-glucose 1-phosphate
- -enzyme phosphoglucomutase
- -reversible reaction
- -product is glucose 6-phosphate
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