N-glycans of the microalga Chlorella vulgaris are of the oligomannosidic type but highly methylated

R. Mócsai, R. Figl, C. Troschl, R. Strasser, E. Svehla, M. Windwarder, A. Thader, F. Altmann, Scientific Reports 9 (2019).

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Abstract
Microalgae of the genus Chlorella vulgaris are candidates for the production of lipids for biofuel production. Besides that, Chlorella vulgaris is marketed as protein and vitamin rich food additive. Its potential as a novel expression system for recombinant proteins inspired us to study its asparagine-linked oligosaccharides (N-glycans) by mass spectrometry, chromatography and gas chromatography. Oligomannosidic N-glycans with up to nine mannoses were the structures found in culture collection strains as well as several commercial products. These glycans co-eluted with plant N-glycans in the highly shape selective porous graphitic carbon chromatography. Thus, Chlorella vulgaris generates oligomannosidic N-glycans of the structural type known from land plants and animals. In fact, Man5 (Man5GlcNAc2) served as substrate for GlcNAc-transferase I and a trace of an endogenous structure with terminal GlcNAc was seen. The unusual more linear Man5 structure recently found on glycoproteins of Chlamydomonas reinhardtii occurred - if at all - in traces only. Notably, a majority of the oligomannosidic glycans was multiply O-methylated with 3-O-methyl and 3,6-di-O-methyl mannoses at the non-reducing termini. This modification has so far been neither found on plant nor vertebrate N-glycans. It’s possible immunogenicity raises concerns as to the use of C. vulgaris for production of pharmaceutical glycoproteins.
Publishing Year
Date Published
2019-01-23
Journal Title
Scientific Reports
Volume
9
Issue
1
Article Number
331
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Mócsai R, Figl R, Troschl C, et al. N-glycans of the microalga Chlorella vulgaris are of the oligomannosidic type but highly methylated. Scientific Reports. 2019;9(1). doi:10.1038/s41598-018-36884-1
Mócsai, R., Figl, R., Troschl, C., Strasser, R., Svehla, E., Windwarder, M., … Altmann, F. (2019). N-glycans of the microalga Chlorella vulgaris are of the oligomannosidic type but highly methylated. Scientific Reports, 9(1). https://doi.org/10.1038/s41598-018-36884-1
Mócsai, Réka, Rudolf Figl, Clemens Troschl, Richard Strasser, Elisabeth Svehla, Markus Windwarder, Andreas Thader, and Friedrich Altmann. “N-Glycans of the Microalga Chlorella Vulgaris Are of the Oligomannosidic Type but Highly Methylated.” Scientific Reports 9, no. 1 (2019). https://doi.org/10.1038/s41598-018-36884-1.
R. Mócsai et al., “N-glycans of the microalga Chlorella vulgaris are of the oligomannosidic type but highly methylated,” Scientific Reports, vol. 9, no. 1, 2019.
Mócsai R, Figl R, Troschl C, Strasser R, Svehla E, Windwarder M, Thader A, Altmann F. 2019. N-glycans of the microalga Chlorella vulgaris are of the oligomannosidic type but highly methylated. Scientific Reports. 9(1).
Mócsai, Réka, et al. “N-Glycans of the Microalga Chlorella Vulgaris Are of the Oligomannosidic Type but Highly Methylated.” Scientific Reports, vol. 9, no. 1, 331, Nature Publishing Group, 2019, doi:10.1038/s41598-018-36884-1.
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