LYTACs that engage the asialoglycoprotein receptor for targeted protein degradation
Nature Chemical Biology, 2021•nature.com
Selective protein degradation platforms have afforded new development opportunities for
therapeutics and tools for biological inquiry. The first lysosome-targeting chimeras (LYTACs)
targeted extracellular and membrane proteins for degradation by bridging a target protein to
the cation-independent mannose-6-phosphate receptor (CI-M6PR). Here, we developed
LYTACs that engage the asialoglycoprotein receptor (ASGPR), a liver-specific lysosome-
targeting receptor, to degrade extracellular proteins in a cell-type-specific manner. We …
therapeutics and tools for biological inquiry. The first lysosome-targeting chimeras (LYTACs)
targeted extracellular and membrane proteins for degradation by bridging a target protein to
the cation-independent mannose-6-phosphate receptor (CI-M6PR). Here, we developed
LYTACs that engage the asialoglycoprotein receptor (ASGPR), a liver-specific lysosome-
targeting receptor, to degrade extracellular proteins in a cell-type-specific manner. We …
Abstract
Selective protein degradation platforms have afforded new development opportunities for therapeutics and tools for biological inquiry. The first lysosome-targeting chimeras (LYTACs) targeted extracellular and membrane proteins for degradation by bridging a target protein to the cation-independent mannose-6-phosphate receptor (CI-M6PR). Here, we developed LYTACs that engage the asialoglycoprotein receptor (ASGPR), a liver-specific lysosome-targeting receptor, to degrade extracellular proteins in a cell-type-specific manner. We conjugated binders to a triantenerrary N-acetylgalactosamine (tri-GalNAc) motif that engages ASGPR to drive the downregulation of proteins. Degradation of epidermal growth factor receptor (EGFR) by GalNAc-LYTAC attenuated EGFR signaling compared to inhibition with an antibody. Furthermore, we demonstrated that a LYTAC consisting of a 3.4-kDa peptide binder linked to a tri-GalNAc ligand degrades integrins and reduces cancer cell proliferation. Degradation with a single tri-GalNAc ligand prompted site-specific conjugation on antibody scaffolds, which improved the pharmacokinetic profile of GalNAc-LYTACs in vivo. GalNAc-LYTACs thus represent an avenue for cell-type-restricted protein degradation.
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