Glucosyltransferases are enzymes that catalyze the transfer of glucose residues from activated donor molecules, such as UDP-glucose, to specific acceptor molecules. This process is a type of glycosylation, which is crucial for the synthesis of various polysaccharides and glycoconjugates. These enzymes play a pivotal role in numerous biological processes, including cell wall formation, protein glycosylation, and signaling pathways.