N-deglycosylation targeting chimera (DGlyTAC): a strategy for immune checkpoint proteins inactivation by specifically removing N-glycan
Abstract Among the leading methods for triggering therapeutic anti-cancer immunity is the inhibition of immune checkpoint pathways. N-glycosylation is found to be essential for the function of various immune checkpoint proteins, playing a critical role in their stability and interaction with immune...
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Publishing Group
2025-04-01
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| Series: | Signal Transduction and Targeted Therapy |
| Online Access: | https://doi.org/10.1038/s41392-025-02219-6 |
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| Summary: | Abstract Among the leading methods for triggering therapeutic anti-cancer immunity is the inhibition of immune checkpoint pathways. N-glycosylation is found to be essential for the function of various immune checkpoint proteins, playing a critical role in their stability and interaction with immune cells. Removing the N-glycans of these proteins seems to be an alternative therapy, but there is a lack of a de-N-glycosylation technique for target protein specificity, which limits its clinical application. Here, we developed a novel technique for specifically removing N-glycans from a target protein on the cell surface, named deglycosylation targeting chimera (DGlyTAC), which employs a fusing protein consisting of Peptide-N-glycosidase F (PNGF) and target-specific nanobody/affibody (Nb/Af). The DGlyTAC technique was developed to target a range of glycosylated surface proteins, especially these immune checkpoints—CD24, CD47, and PD-L1, which minimally affected the overall N-glycosylation landscape and the N-glycosylation of other representative membrane proteins, ensuring high specificity and minimal off-target effects. Importantly, DGlyTAC technique was successfully applied to lead inactivation of these immune checkpoints, especially PD-L1, and showed more potential in cancer immunotherapy than inhibitors. Finally, PD-L1 targeted DGlyTAC showed therapeutic effects on several tumors in vivo, even better than PD-L1 antibody. Overall, we created a novel target-specific N-glysocylation erasing technique that establishes a modular strategy for directing membrane proteins inactivation, with broad implications on tumor immune therapeutics. |
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| ISSN: | 2059-3635 |