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Information on EC - 3-galactosyl-N-acetylglucosaminide 4-alpha-L-fucosyltransferase

for references in articles please use BRENDA:EC2.4.1.65
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IUBMB Comments
This enzyme is the product of the Lewis blood group gene. Normally acts on a glycoconjugate where R (see reaction) is a glycoprotein or glycolipid. Although it is a 4-fucosyltransferase, it has a persistent 3-fucosyltransferase activity towards the glucose residue in free lactose. This enzyme fucosylates on O-4 of an N-acetylglucosamine that carries a galactosyl group on O-3, unlike EC, 4-galactosyl-N-acetylglucosaminide 3-alpha-L-fucosyltransferase, which fucosylates on O-3 of an N-acetylglucosamine that carries a galactosyl group on O-4. Enzymes catalysing the 4-alpha-fucosylation of the GlcNAc in beta-D-Gal-(1->3)-beta-GlcNAc sequences (with some activity also as 3-alpha-fucosyltransferases) are present in plants, where the function in vivo is the modification of N-glycans. In addition, the fucTa gene of Helicobacter strain UA948 encodes a fucosyltransferase with both 3-alpha- and 4-alpha-fucosyltransferase activities.
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Word Map
The enzyme appears in viruses and cellular organisms
fuc-t, fuc-tiii, alpha-1,3-fucosyltransferase, fucosyltransferase iv, fuct-iii, fuct-vi, fuct v, fuct iii, fucosyltransferase vi, ft-iv, more
GDP-beta-L-fucose + beta-D-galactosyl-(1->3)-N-acetyl-beta-D-glucosaminyl-R = GDP + beta-D-galactosyl-(1->3)-[alpha-L-fucosyl-(1->4)]-N-acetyl-beta-D-glucosaminyl-R
show the reaction diagram