label: galactolipid galactosyltransferase activity
label_lc: galactolipid galactosyltransferase activity
description: "Catalysis of the reaction: 2 mono-beta-D-galactosyldiacylglycerol = alpha-D-galactosyl-beta-D-galactosyldiacylglycerol + 1,2-diacylglycerol."