Polysaccharide biosynthesis
This family of proteins plays a role in xylan biosynthesis in plant cell walls. IRX15/IRX15-L precise role in xylan biosynthesis is unknown. Glucuronoxylan methyltransferase (GXMT) catalyzes 4-O-methylation of the glucuronic acid substituents of this polysaccharide. AtGXMT1 specifically transfers the methyl group from S-adenosyl-l-methionine to O-4 of alpha-d-glucopyranosyluronic acid residues that are linked to O-2 of the xylan backbone. The function of members of this family in animals and fungi is not known.
Jiyao W et al.(2023). "The conserved domain database in 2023.",