Abstract
ER resident glycoproteins, including ectopically expressed recombinant glycoproteins, carry so-called high-mannose type N-glycans, which can be at different stages of processing. The presence of heterogeneous high-mannose type glycans on ER-retained therapeutic proteins is undesirable for specific therapeutic applications. Previously, we described an Arabidopsis alg3-2 glycosylation mutant in which aberrant Man5GlcNAc2
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