UDP-Glc:tetrahydrobiopterin alpha-glucosyltransferase and similar proteins
This family is most closely related to the GT4 family of glycosyltransferases. aviGT4 in Streptomyces viridochromogenes has been shown to be involved in biosynthesis of oligosaccharide antibiotic avilamycin A. Inactivation of aviGT4 resulted in a mutant that accumulated a novel avilamycin derivative lacking the terminal eurekanate residue.