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SNIPERs are bifunctional degraders that use inhibitor of apoptosis proteins as the E3 ubiquitin ligase. Each specific and nongenetic IAP-dependent protein eraser (SNIPER) joins a target ligand through a linker to a ligand for an inhibitor of apoptosis protein (IAP). The bound IAP, such as cellular IAP 1 (cIAP1) or X-linked IAP (XIAP), ubiquitinates the target for proteasomal degradation. A 2010 study used methyl bestatin hybrids to degrade cellular retinoic acid-binding proteins (CRABPs), and SNIPER(CRABP)-11 follows that design. In 2017, Abelson kinase (ABL) inhibitors were joined to IAP ligands to degrade the oncogenic fusion protein breakpoint cluster region-ABL (BCR-ABL). SNIPER(ABL)-062 and SNIPER(ABL)-039 belong to this series, whereas SNIPER(BRD)-1 degrades bromodomain-containing protein 4 (BRD4).
SNIPER(ABL)-062, in which an ABL inhibitor is linked to a ligand of cIAP1 via a linker containing a variable polyethylene glycol (PEG) unit, shows a potent activity to degrade the BCR-ABL protein.
HG-7-85-01-NH2 is a synthetic ligand designed for use in SNIPER (specific and potent target protein degradation) applications. This compound features the HG-7-85-01 moiety, which inhibits ABL, and is linked to an IAP ligand to facilitate targeted protein degradation. It holds potential for advancing research in targeted therapies and cellular protein regulation.
