Does anyone know of a sialylated N-linked di-antennary oilgosaccharide
that contains both a2,6 and a2,3 linked sialic acid?
I realise that di-antennarys are usually a2,6 sialylated and, despite
the fact that N-a2,3 sialyltransferase is quite capable of sialylating
di-antennarys in vitro, FEBS letters 363, 280-284 1995, naturally
a2,3 sialylation has so far been confined to tri and tetra-antennary
structures, but is this is a strict rule or a majority situation?
martin at axford.demon.co.uk