The MCL-1 BH3 helix is an exclusive MCL-1 inhibitor and apoptosis sensitizer
Open accessAbstract
The development of selective inhibitors for discrete anti-apoptotic BCL-2 family proteins implicated in pathologic cell survival remains a formidable but pressing challenge. Such precisely tailored compounds would serve as molecular probes and targeted therapies to study and treat human diseases driven by specific anti-apoptotic blockades. In particular, MCL-1 has emerged as a major resistance factor in human cancer. By screening a library of stabilized alpha-helix of BCL-2 domains (SAHBs), we determined that the MCL-1 BH3 helix is itself a potent and exclusive MCL-1 inhibitor. X-ray crystallography and mutagenesis studies defined key binding and specificity determinants, including the capacity to harness the hydrocarbon staple to optimize affinity while preserving selectivity. MCL-1 SAHB directly targets MCL-1, neutralizes its inhibitory interaction with pro-apoptotic BAK and sensitizes cancer cells to caspase-dependent apoptosis. By leveraging nature's solution to ligand selectivity, we generated an MCL-1-specific agent that defines the structural and functional features of targeted MCL-1 inhibition.
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- Authors
- Stewart, M. L., Fire, E., Keating, A. E., & Walensky, L. D.
- Affiliations
- Boston Children's Hospital (US)
- Massachusetts Institute of Technology (US)
- Corresponding author
- Walensky, Loren D
- Venue
- Nature Chemical Biology
- Published
- 2010-06-20
- Volume
- 6
- Issue
- 8
- Pages
- 595-601
- ISSN
- 1552-4450 (ISSN-L)
- 1552-4469
- PMC
- PMC3033224
- OpenAlex
- W1551855406
- Cited by
- 418
- References
- 45
- Citations by year
- 2026: 5 · 2025: 22 · 2024: 15 · 2023: 21 · 2022: 10 · 2021: 19 · 2020: 23 · 2019: 24 · 2018: 22 · 2017: 24 · 2016: 33 · 2015: 34 · 2014: 42 · 2013: 35 · 2012: 45
- FWCI
- 16.41
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature Chemical Biology (publishedVersion)
- Worldwide Protein Data Bank (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-sa)
- PMC
- Funders
- U.S. Department of Energy (AC02‐06CH11357, 06CH11357, RR-15301, DE-AC02-)
- National Institutes of Health (1f31ca144566-01, DE-AC02–06CH11357, 5r01gm084181-04, 5P01CA92625, RR15301)
- National Cancer Institute (F31 CA144566, 1F31CA144566, P01CA092625, 5P01CA92625)
- National Institute of General Medical Sciences (R01-GM084181, 5R01GM084181)
- National Center for Research Resources (RR 15301, P41RR015301)
- Basic Energy Sciences (DE-AC02, AC02‐06CH11357, 06CH11357, RR-15301)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Keywords
- Mcl-1, stapled peptides, Bcl-2 family proteins, Mcl-1 inhibitors, apoptosis sensitization, Bak, binding specificity, chemoresistance, caspase-dependent apoptosis, anti-apoptotic proteins
- MeSH terms
- Amino Acid Sequence, Cell Survival, Cross-Linking Reagents, Enzyme Activation, Humans, Mitochondria, Models, Molecular, Molecular Sequence Data, Peptides, Protein Binding, Apoptosis, Protein Structure, Secondary, Crystallography, X-Ray, Jurkat Cells, Proto-Oncogene Proteins c-bcl-2, Cytochromes c, Immunoprecipitation, bcl-2 Homologous Antagonist-Killer Protein, Caspase 3, Caspase 7, Myeloid Cell Leukemia Sequence 1 Protein
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