Beta-galactoside alpha-2,6-sialyltransferase 1 is an enzyme that in humans is encoded by the ST6GAL1 gene. This gene encodes a member of glycosyltransferase family 29. The encoded protein is a type II membrane protein that catalyzes the transfer of sialic acid from CMP-sialic acid to galactose-containing substrates. The protein, which is normally found in the Golgi but can be proteolytically processed to a soluble form, is involved in the generation of the cell-surface carbohydrate determinants and differentiation antigens HB-6, CD75, and CD76. This gene has been incorrectly referred to as CD75. Three transcript variants encoding two different isoforms have been described. [provided by RefSeq].
Function: Transfers sialic acid from the donor of substrate CMP-sialic acid to galactose containing acceptor substrates.