Stabilizing the Pro-Apoptotic BimBH3 Helix (BimSAHB) Does Not Necessarily Enhance Affinity or Biological Activity
Abstract
An attractive approach for developing therapeutic peptides is to enhance binding to their targets by stabilizing their α-helical conformation, for example, stabilized BimBH3 peptides (BimSAHB) designed to induce apoptosis. Unexpectedly, we found that such modified peptides have reduced affinity for their targets, the pro-survival Bcl-2 proteins. We attribute this loss in affinity to disruption of a network of stabilizing intramolecular interactions present in the bound state of the native peptide. Altering this network may compromise binding affinity, as in the case of the BimBH3 stapled peptide studied here. Moreover, cells exposed to these peptides do not readily undergo apoptosis, strongly indicating that BimSAHB is not inherently cell permeable.
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- Authors
- Okamoto, T., Zobel, K., Fedorova, A., Quan, C., Yang, H., Fairbrother, W. J., Huang, D. C. S., Smith, B. J., Deshayes, K., & Czabotar, P. E.
- Affiliations
- The University of Melbourne (AU)
- Genentech (US)
- Corresponding author
- Smith, Brian J.
- Deshayes, Kurt
- Czabotar, Peter E.
- ORCID
- Venue
- ACS Chemical Biology
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-12-10
- Volume
- 8
- Issue
- 2
- Pages
- 297-302
- ISSN
- 1554-8929 (ISSN-L)
- 1554-8937
- OpenAlex
- W2007141443
- Cited by
- 136
- References
- 27
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 6 · 2023: 4 · 2022: 4 · 2021: 9 · 2020: 8 · 2019: 12 · 2018: 4 · 2017: 9 · 2016: 19 · 2015: 19 · 2014: 22 · 2013: 14
- FWCI
- 7.20
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ACS Chemical Biology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Physical Sciences › Materials Science › Biomaterials › Supramolecular Self-Assembly in Materials
- Keywords
- peptide stabilization, alpha-helical conformation, Bcl-2 family proteins, binding affinity, intramolecular interactions, stapled peptides, apoptosis induction, membrane permeability, peptide therapeutics
- MeSH terms
- Animals, Humans, Models, Molecular, Peptide Fragments, Proto-Oncogene Proteins, Apoptosis, Protein Structure, Secondary, Mice
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