9.B.142 The Integral membrane Glycosyltransferase family 39 (GT39) Family
Thousands of homologues of the GT39 family are found in bacteria, archaea and eukaryotes. These integral membrane proteins function in glycosyl transfer, but some such enzymes have been shown to transport their substrates across the membrane in which they reside. See TC families 4.D.1 and 4.D.2. These proteins may be distantly related to those in family 9.B.144.