Distal Branching of i-Type Polylactosamine Backbones

The first branching reaction of polylactosamine backbones was described by Pfiller et al. [36] who found an appropriate pi,6-GlcNAc transferase activity in hog gastric mucosal microsomes. This activity catalyzed the reaction shown in eq. (1). 

A glycolipid from hog gastric mucosa contains a large, branched polylactosamine backbone [41] that is strikingly similar to the tetradecameric polylactosamine backbone of Seppo et al. [39]. 

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