This family represents a conserved region of approximately 180 residues within plant and bacterial monogalactosyldiacylglycerol (MGDG) synthase (EC:2.4.1.46). In Arabidopsis, there are two types of MGDG synthase which differ in their N-terminal portion: type A and type B [1].

1: Two types of MGDG synthase genes, found widely in both 16:3 and 18:3 plants, differentially mediate galactolipid syntheses in photosynthetic and nonphotosynthetic tissues in Arabidopsis thaliana. Awai K, Marechal E, Block MA, Brun D, Masuda T, Shimada H, Takamiya K, Ohta H, Joyard J; Proc Natl Acad Sci U S A 2001;98:10960-10965. PMID:11553816