A group from UC San Diego, etc. has shown that a complex type N-glycan at N343 position controls open and close configurations of SARS-cOv-2 RBD with using a molecular dynamics simulations. It will be clear from the figures below.
https://www.biorxiv.org/content/10.1101/2021.02.15.431212v1
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Pioneer in Glycan Profiling Technology Environmentally Regenerative Agriculture