3-O-alpha-D-mannopyranosyl-alpha-D-mannopyranose xylosylphosphotransferase (, XPT1) is an enzyme with systematic name UDP-D-xylose:3-O-alpha-D-mannopyranosyl-alpha-D-mannopyranose xylosylphosphotransferase. This enzyme catalyses the following chemical reaction
UDP-xylose + 3-O-alpha-D-mannopyranosyl-alpha-D-mannopyranose UMP + 3-O-(6-O-alpha-D-xylosylphospho-alpha-D-mannopyranosyl)-alpha-D-mannopyranose
Mn2+ required for activity.
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