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Updated: Jun 26, 2025
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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
Published on: March 14, 2019
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Cadmium binding by the F-box domain induces p97-mediated SCF complex disassembly to activate stress response programs
Linda Lauinger1, Anna Andronicos2, Karin Flick2
1Department of Biological Chemistry, University of California, Irvine, Irvine, CA, 92697, USA. llauinge@uci.edu.
Nature Communications
|May 8, 2024
Summary
The F-box domain acts as an environmental sensor, detecting cadmium stress. This cadmium binding inactivates the SCFMet30 ubiquitin ligase, protecting cells from heavy metal toxicity.
Area of Science:
- Biochemistry
- Molecular Biology
- Cellular Biology
Background:
- The F-box domain is a key component of Skp1/Cullin1/F-box protein (SCF) ubiquitin ligase complexes.
- Its known function is to mediate protein-protein interactions with Skp1.
Purpose of the Study:
- To investigate the potential role of the F-box domain as an environmental sensor.
- To determine if the F-box domain of Met30 can sense and respond to cadmium stress.
Main Methods:
- Biochemical assays to measure cadmium binding to the Met30 F-box domain.
- Analysis of SCFMet30 complex assembly and disassembly under cadmium stress.
- Investigation of Met30 autoubiquitylation and its role in complex inactivation.
Main Results:
- The Met30 F-box domain binds cadmium with a KD of 8 µM, mediated by conserved cysteine residues.
- Cadmium binding induces a conformational change leading to Met30 autoubiquitylation.
- Autoubiquitylation triggers SCFMet30 disassembly via Cdc48/p97/VCP recruitment, inactivating the ligase.
Conclusions:
- F-box domains can function as environmental sensors, not just Skp1 interaction modules.
- The Met30 F-box domain acts as a direct cadmium sensor, regulating SCFMet30 activity.
- This regulatory mechanism provides cellular protection against cadmium-induced stress.
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