Bax-inhibiting peptides derived from Ku70 and cell-penetrating pentapeptides
Abstract
We found that Ku70, a known DNA repair factor, has a novel function to bind and inhibit Bax (Bcl-2-associated X protein), a key mediator of apoptosis. Pentapeptides derived from the Bax-binding domain of Ku70 were cell-permeable and protected cells from Bax-mediated apoptosis. These pentapeptides were called BIPs (Bax-inhibiting peptides). BIPs may become a useful therapeutic tool to reduce cellular damage. We also generated BIP mutant pentapeptides that do not inhibit Bax, but retain their cell-penetrating activity. Since both BIPs and BIP mutants are cell-permeable, these peptides were designated CPP5s (cell-penetrating pentapeptides). Among the CPP5s discovered, VPTLK (BIP) and KLPVM (BIP mutant) were confirmed to possess protein transduction activity by examination of the delivery of GFP (green fluorescent protein) into cells by these peptides. The mechanism of cell penetration by CPP5s is not known. CPP5s enter the cell at 0 and 4 degrees C. In preliminary studies, various inhibitors of endocytosis and pinocytosis did not show any significant suppression of CPP5 cell entry. CPP5s have very low toxicity in vitro and in vivo and so may be useful tools in order to develop non-toxic drug-delivery technologies.
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Ku70 binds Bax and inhibits its activity.
“Furthermore, Ku70 is able to bind Bax and inhibit its activity [75].”
From Integration of DNA damage and repair with murine double-minute 2 (Mdm2) in tumorigenesis (2012) · cites this paper as [75]
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- Authors
- Gomez, J. A., Gama, V., Yoshida, T., Sun, W., Hayes, P., Leskov, K., Boothman, D., & Matsuyama, S.
- Affiliations
- Pharmacology Department, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, U.S.A.
- Case Western Reserve University (US)
- Tohoku University (JP)
- Sankyo Pharmaceutical Co. Ltd, Tokyo, Japan
- Medical College of Wisconsin (US)
- The University of Texas Southwestern Medical Center (US)
- Case Comprehensive Cancer Center (US)
- Corresponding author
- Gama, V.
- Matsuyama, S.
- Venue
- Biochemical Society Transactions
- Publisher
- Portland Press Ltd.
- Published
- 2007-07-20
- Volume
- 35
- Issue
- 4
- Pages
- 797-801
- ISSN
- 0300-5127 (ISSN-L)
- 1470-8752
- OpenAlex
- W2105472817
- Cited by
- 97
- References
- 40
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 6 · 2023: 1 · 2022: 4 · 2021: 4 · 2020: 2 · 2019: 9 · 2018: 8 · 2017: 3 · 2016: 2 · 2015: 6 · 2014: 7 · 2013: 4 · 2012: 8
- FWCI
- 0.72
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Biochemical Society Transactions (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Cancer Institute (1R01CA1027921, P20 CA10373, R01CA102792, P30CA142543)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
- Keywords
- Ku70, Bax, apoptosis, protein transduction, cell-penetrating peptides, DNA repair, drug delivery
- MeSH terms
- Ku Autoantigen, Animals, DNA-Binding Proteins, Humans, Oligopeptides, Drug Delivery Systems, Protein Transport, Protein Sorting Signals, Antigens, Nuclear, bcl-2-Associated X Protein
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