An enzyme that catalyzes the transfer of glycosyl groups to an acceptor. The acceptor molecules are frequently carbohydrate molecules, or inorganic phosphates. A special subsect of glycosyltransferases can also catalyze hydrolysis. Subclasses include Hexosyltransferases, Pentosyltransferases and Sialyltransferases. 2005

Enzymes that catalyze the transfer of glycosyl groups to an acceptor. Most often another carbohydrate molecule acts as an acceptor, but inorganic phosphate can also act as an acceptor, such as in the case of PHOSPHORYLASES. Some of the enzymes in this group also catalyze hydrolysis, which can be regarded as transfer of a glycosyl group from the donor to water. Subclasses include the HEXOSYLTRANSFERASES; PENTOSYLTRANSFERASES; SIALYLTRANSFERASES; and those transferring other glycosyl groups. EC 2.4.