In the cis- to medial Golgis, conversion of high-mannose to complex type N-glycans side chains of Spike occurs. The N-acetylglucosaminyltransferase called GlcNAc-TI (MGAT1) adds a GlcNAc residue in the core of some high-mannose chains (Ritchie et al, 2010; Nal et al, 2005, Song et al, 2004).
Ritchie, G, Harvey, DJ, Feldmann, F, Stroeher, U, Feldmann, H, Royle, L, Dwek, RA, Rudd, PM
acetylglucosaminyltransferase activity of MGAT1 [endoplasmic reticulum-Golgi intermediate compartment membrane]
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