Related Experiment Video
Updated: Jun 7, 2026

Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
Published on: March 18, 2012
Flavin redox switching of protein functions
Donald F Becker1, Weidong Zhu, Michael A Moxley
1Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0664, USA. dbecker3@unl.edu
Flavin cofactors act as redox switches in proteins, controlling biological processes like signaling and adaptation. These switches, especially in PAS domains, translate redox changes into functional protein outputs.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Flavin cofactors provide enzymes with catalytic diversity and act as redox sensors.
- Flavin redox states regulate crucial cellular functions including transcriptional regulation, signaling, and adaptation.
- Per-Arnt-Sim (PAS) domain proteins frequently utilize flavin redox switches, functioning as photosensors and responders to redox conditions.
Purpose of the Study:
- To explore the mechanisms by which flavin redox states control protein function.
- To investigate the role of flavin switches in Per-Arnt-Sim (PAS) domain proteins and other protein families.
- To identify common themes in flavin-mediated regulation of protein structure and function.
Main Methods:
- Biochemical analyses of flavoproteins.
- Structural studies of PAS domain flavoproteins.
- Comparative analysis of diverse flavin-switch proteins.
Main Results:
- PAS domain flavoproteins translate flavin redox changes into functional outputs, such as protein binding.
- Emerging studies reveal flavin redox state control over protein-membrane interactions in non-PAS proteins.
- Shared mechanistic principles govern flavin-mediated regulation across different protein types.
Conclusions:
- Flavin cofactors are versatile regulators of protein function through their redox states.
- Understanding flavin switches provides insights into signaling, adaptation, and cellular processes.
- Flavin-mediated mechanisms offer conserved strategies for controlling protein activity and interactions.
More Related Videos
Related Concept Videos
Redox Reactions
Redox Reactions
Oxidation of Phenols to Quinones
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
Protein Dynamics in Living Cells
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Transcriptional Regulation: Riboswitches
Covalently Linked Protein Regulators
These groups modify specific amino acids in a protein.

![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)