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. 2021 Dec 2;12:795741. doi: 10.3389/fimmu.2021.795741

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Copyright © 2021 Lin, Chen, Chen, Lee and Wu

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic representation of SARS COV2 spike glycoprotein. (A) Positions of the original N-linked glycan (red) and the engineered N-linked glycan (green) amino-acid sequences shown as branches. Domains of the full-length S protein: N-terminal domain (NTD), receptor binding domain (RBD), furin cleavage site (S1/S2), fusion peptide (FP), heptad repeat 1(HR1), heptad repeat 2 (HR2), transmembrane domain (TM), and cytoplasmic tail (CT); (B) The seven engineered N-linked glycan sites of (#1) F135N/N137T, (#2) R158N/Y160T, (#3) N354/K356T, (#4) N370/A372T, (#5) G413N, (#6) D428N, and (#7) H519N/P521T are shown in the intact trimeric S structure.