Transfers sialic acid from the donor of substrate CMP-sialic acid to galactose containing acceptor substrates. Has alpha-2,6-sialyltransferase activity toward oligosaccharides that have the Gal-beta-1,4-GlcNAc sequence at the non-reducing end of their carbohydrate groups, but it has weak or no activities toward glycoproteins and glycolipids.
Golgi apparatus, Golgi stack membrane ; Single-pass type II membrane protein .
Weakly expressed in some tissues, such as small intestine, colon and fetal brain.
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