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Covalent Modification at Cys151 Dissociates the Electrophile Sensor Keap1 from the Ubiquitin Ligase CUL3
Open accessAbstract
The regulation of cellular stress responses to electrophiles and oxidants is mediated by the transcription factor NF-E2-related factor 2 (Nrf2), which, in turn, is regulated by CUL-E3 (CUL3) ligase-mediated ubiquitylation. The Kelch-like ECH-associated protein 1 (Keap1) serves as an adapter between CUL3 and Nrf2. We used the model electrophile N-iodoacetyl- N-biotinylhexylenediamine (IAB) to define the relationship among the adduction of Keap1 cysteine residues, structure, and function. Exposure of Keap1 to IAB in vitro was accompanied by progressive loss of protein secondary structure, as monitored by CD spectroscopy and a loss of the ability to associate with recombinant CUL3. Dissociation of Keap1 from CUL3 in vitro was dependent upon C151 in Keap1. A quantitative mass spectrometry-based kinetic analysis of adduction in HEK293 cells expressing FLAG-Keap1 revealed that Cys151 was one of the most reactive residues in vivo and that it was required for IAB-mediated dissociation of the Keap1-CUL3 interaction. These results demonstrate that Cys151 adduction confers a critical alkylation sensor function upon Keap1, making Keap1 unique among BTB CUL3 adapter proteins.
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Metadata
- Authors
- Rachakonda, G., Xiong, Y., Sekhar, K. R., Stamer, S. L., Liebler, D. C., & Freeman, M. L.
- Venue
- Chemical Research in Toxicology
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-02-06
- Volume
- 21
- Issue
- 3
- Pages
- 705-710
- ISSN
- 0893-228X (ISSN-L)
- 1520-5010
- OpenAlex
- W1968883331
- Cited by
- 207
- References
- 8
- FWCI
- 5.71
- Type
- journal article
- Language
- en
- Open access
- hybrid
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