sn-glycerol-3-phosphate 1-galactosyltransferase () is an enzyme that catalyzes the chemical reaction

The two substrates of this enzyme characterised from Ochromonas malhamensis are sn glycerol 3-phosphate and UDP-galactose. Its products are 1-α-D-galactosyl-sn-glycerol 3-phosphate and uridine diphosphate (UDP).

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-galactose:sn-glycerol-3-phosphate 1-alpha-D-galactosyltransferase. Other names in common use include isofloridoside-phosphate synthase, UDP-Gal:sn-glycero-3-phosphoric acid 1-alpha-galactosyl-transferase, UDPgalactose:sn-glycerol-3-phosphate alpha-D-galactosyltransferase, uridine diphosphogalactose-glycerol phosphate galactosyltransferase, and glycerol 3-phosphate 1alpha-galactosyltransferase.

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