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- W3040003375 abstract "Summary The HIV-1 envelope glycoprotein (Env) trimer is decorated with N -linked glycans, which are attached to asparagine residues in the amino acid sequon NxT/S by oligosaccharyltransferases (OST). Artificial glycan “holes” exist when a PNGS is under-occupied on recombinant Env-based vaccines, but not on their viral counterpart. Native-like SOSIP trimers, including clinical candidates, have these artificial holes in the glycan shield that induce strain-specific neutralizing antibodies (NAbs) or non-NAbs. To increase PNGS occupancy, eliminate artificial glycan holes, and mimic the glycosylation of native BG505 Env, we replaced all 12 NxS sequons on the BG505 SOSIP trimer with NxT, thereby increasing the affinity of the sequons for OST. All PNGS, except N133 and N160, were nearly fully occupied on the modified trimer. Occupancy of the N133 site could be increased by changing N133 to NxS, while occupancy of the N160 site could be restored by reverting the nearby N156 sequon to NxS. Hence, OST affinity can influence glycan occupancy when two PNGS are in close proximity. Increasing glycan occupancy should reduce off-target immune responses to artificial glycan holes on vaccine antigens." @default.
- W3040003375 created "2020-07-10" @default.
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- W3040003375 date "2020-07-02" @default.
- W3040003375 modified "2023-10-18" @default.
- W3040003375 title "Enhancing glycan occupancy of soluble HIV-1 envelope trimers to mimic the native viral spike" @default.
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- W3040003375 doi "https://doi.org/10.1101/2020.07.02.184135" @default.
- W3040003375 hasPublicationYear "2020" @default.
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