Surprisingly, in the ΔXT/FT mutant, which lacks plant-specific core modifications, smaller amounts of bisecting glycoforms were synthesized as compared to wild-type plants [46].
A further reason for the lacking plant species effect was probably the rather small patch size of plant individuals given under field conditions.
We used N. benthamiana ΔXTFT as a host in a first set of experiments aimed at generating rhEPOELD with human-like N-glycosylation, i.e. lacking plant specific core α1,3-fucose and β1,2-xylose residues.
The transformation procedure was optimised for high level expression (up to 10 μg/ml) and successfully performed even with a transgenic glyco-engineered strain lacking plant-specific immunogenic sugar residues in N-glycans.
N. benthamiana ΔXTFT plants lacking plant-specific α1,3-fucosylation and β1,2-xylosylation were grown at 24°C with a 16-h light:8-h dark photoperiod.
Another major breakthrough towards the humanization of the plant N-glycosylation pathway was the generation of mutants lacking plant-specific β1,2-xylose and core α1,3-fucose.
A crucial achievement in using plants as an expression platform was the generation of mutants that lack plant-specific N-glycosylation, i.e. β1,2-xylosylation and core α1,3-fucosylation.
To this end, we overexpressed human GnTIII, IV and V and modified versions thereof in the glycoengineered Nicotiana benthamiana, lacking plant-specific sugar residues (▵XT/FT; Strasser et al. 2008).
However, the initial Textpresso cellular component category was derived solely from the C. elegans literature and thus lacked plant-specific terms such as chloroplast or thylakoid and included some terms that were not relevant to the Arabidopsis literature.
Often when ammonia lacks, this plant switches to nitrite assimilation, and then nitrate.
