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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).
Synonyms: SNIPER(BRD4)1; SNIPER(BRD4)
SNIPER(BRD4)-1 is a specific and nongenetic inhibitor of apoptosis protein (IAP)-dependent protein eraser (SNIPER) which acts as a protein degradation inducer of bromodomain-containing protein 4 (BRD4).
SNIPER(ABL)-039, conjugating Dasatinib (ABL inhibitor) to LCL161 derivative (IAP ligand) with a linker, induces the reduction of BCR-ABL protein with a DC50 of 10 nM. IC50s are 0.54 nM, 10 nM, 12 nM, and 50 nM for ABL, cIAP1, cIAP2, XIAP, respectively.
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SNIPER(ABL)-033, conjugating HG-7-85-01 (ABL inhibitor) to LCL161 derivative (IAP ligand) with a linker, induces the reduction of BCR-ABL protein with a DC50 of 0.3 μM.
SNIPER(ABL)-024, conjugating GNF5 (ABL inhibitor) to LCL161 derivative (IAP ligand) with a linker, induces the reduction of BCR-ABL protein with a DC50 of 5μM.
SNIPER(ABL)-058, conjugating Imatinib (ABL inhibitor) to LCL161 derivative (IAP ligand) with a linker, induces the reduction of BCR-ABL protein with a DC50 of 10 μM.
BzNH-BS is a bifunctional reagent designed to target the cellular inhibitor of apoptosis protein 1 (cIAP1) through its ligand methyl-bestatin (MeBS) and a benzoyl-amide. This compound operates as a SNIPER (Specific and Non-genetic IAP-dependent protein Eraser) to promote the ubiquitination and subsequent degradation of cIAP1. BzNH-BS is useful in studying apoptosis regulation and can be applied in cancer research to explore IAP-related pathways and therapeutic interventions.
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