LYTACs that engage the asialoglycoprotein receptor for targeted protein degradation

G Ahn, SM Banik, CL Miller, NM Riley… - Nature Chemical …, 2021 - nature.com
Nature Chemical Biology, 2021nature.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 …
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.
nature.com
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