Reaction catalyzed by galactolipid galactosyltransferase (2.4.1.184)
+
=
+
1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol
+
1,2-diacyl-3-O-(beta-D-galactosyl)-sn-glycerol
=
1,2-diacyl-3-O-[alpha-D-galactosyl-(1->6)-beta-D-galactosyl]-sn-glycerol
+
1,2-diacyl-sn-glycerol