Synthesis of SNIPERs against BCR-ABL with kinase inhibitors and a method to evaluate their growth inhibitory activity derived from BCR-ABL degradation

Methods Enzymol. 2023:681:41-60. doi: 10.1016/bs.mie.2022.09.001. Epub 2022 Nov 18.


Specific and nongenetic IAP-dependent Protein Erasers (SNIPERs) are a kind of PROTACs recruiting IAP ubiquitin ligases to induce degradation of target proteins. We have developed a series of SNIPERs against BCR-ABL oncogenic kinases by employing kinase inhibitors as target ligands. Some of these SNIPERs show potent activities to degrade BCR-ABL protein and inhibit CML cell growth. However, since SNIPERs also inhibit kinase activity, it takes some ingenuity to show that degradation of BCR-ABL plays a significant role on growth inhibitory activity. Here we describe protocols for synthesizing SNIPERs against BCR-ABL oncogenic kinase that contain kinase inhibitors as target ligands, and methods for evaluating the growth inhibitory activity against cancer cells, especially focusing on a method to discriminate the significance of protein degradation from that of kinase inhibition.

Keywords: BCR-ABL; Kinase inhibitors; PROTACs; SNIPERs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Fusion Proteins, bcr-abl* / metabolism
  • Inhibitor of Apoptosis Proteins* / metabolism
  • Ligands
  • Phosphorylation
  • Protein Kinase Inhibitors / pharmacology
  • Proteolysis


  • Ligands
  • Fusion Proteins, bcr-abl
  • Inhibitor of Apoptosis Proteins
  • Protein Kinase Inhibitors