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. 2023 Dec 4;34(2):cwad097. doi: 10.1093/glycob/cwad097

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© The Author(s) 2023. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 4 — Site-specific N-linked glycosylation occupancy and structural heterogeneity of SARS-CoV-2 spike proteins of Wu-1, gamma and NTD mutants. Site-specific N-glycosylation occupancy at sites (A) N17, (B) N20 and (C) N188. D) Principal component analysis (PCA) of glycoform abundances excluding N188. Site-specific glycoform analysis at sites (E) N17 and N20 with the (F) log₂ fold change relative to Wu-1 (blue increased abundance, red decreased abundance, P < 0.05). For N17 in (E) the unmodified intensity for T20N, L18F/T20N, L18F/T20N/R190S and gamma were inferred from the occupancy analysis. (G) Site-specific glycoform analysis at site N188. HexNAc, N-acetylhexosamine; hex, hexose; Fuc, fucose; NeuAc, N-acetylneuraminic acid.