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Redirecting the neo-substrate specificity of Cereblon-targeting PROTACs to Helios

ABSTRACT: Immunomodulatory imide drugs (IMiDs), such as thalidomide and its analogues, are some of the most commonly utilized E3 ligase ligands for the development of proteolysis targeting chimeras (PROTACs). While the canonical neo-substrates of IMiDs (i.e., Ikaros and Aiolos) are often considered to be unwanted off-targets of PROTACs, maintaining the degradation of these neo-substrates also provides the opportunity to synergistically degrade multiple proteins with a single compound. Here, we report the development of ALV-07-082-03, a CDK4/CDK6/Helios triple degrader that consists of palbociclib, an FDA-approved CDK4/6 inhibitor, conjugated to DKY709, a novel IMiD-based Helios degrader. Pharmacological co-degradation of CDK4/6 and Helios resulted in potent suppression of downstream signaling and proliferation in cancer cells, as well as enhanced de-repression of IL-2 secretion. Thus, not only do we demonstrate the possibility of rationally re-directing the neo-substrate specificity of PROTACs by incorporating alternative molecular glue molecules as E3 ligase ligands, but our findings also suggest that co-targeting CDK4/6 and Helios may have synergistic effects.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Cell Suspension Culture

SUBMITTER: Eric Fischer

LAB HEAD: Eric Fischer

PROVIDER: PXD036170 | Pride | 2022-09-07

REPOSITORIES: Pride

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