Related Experiment Video

Updated: Aug 19, 2026

Measurements of Physiological Stress Responses in C. Elegans
10:36

Measurements of Physiological Stress Responses in C. Elegans

Published on: May 21, 2020

Molecular mechanisms activating the Nrf2-Keap1 pathway of antioxidant gene regulation

Makoto Kobayashi1, Masayuki Yamamoto

  • 1ERATO-JST, Center for TARA and Institute of Basic Medical Sciences, University of Tsukuba, Tsukuba 305-8577, Japan. kobayash@tara.tsukuba.ac.jp

Antioxidants & Redox Signaling
|February 12, 2005
PubMed

Insights

The Nrf2-Keap1 system regulates cellular defense by controlling the degradation of Nrf2, a key factor in antioxidant and detoxification responses. This mechanism is conserved across vertebrates, highlighting its evolutionary importance.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • NF-E2-related factor 2 (Nrf2) regulates antioxidant and detoxifying genes.
  • Nrf2 plays a crucial role in cytoprotection, including anticarcinogenicity and neuroprotection.
  • The Nrf2-Keap1 interaction is central to Nrf2 regulation.

Purpose of the Study:

  • To review recent advancements in understanding the Nrf2-Keap1 system.
  • To elucidate the molecular mechanisms governing Nrf2 regulation.
  • To highlight the conserved role of Nrf2 in vertebrate cellular defense.

Main Methods:

  • Literature review of studies on Nrf2 and Keap1.
  • Analysis of Nrf2 activation and degradation pathways.
  • Examination of the Nrf2-Keap1 complex structure and function.

Main Results:

  • Nrf2 is degraded via the ubiquitin-proteasome pathway when bound to Keap1 in the cytoplasm.
  • Cytoplasmic dissociation of Nrf2 from Keap1 leads to nuclear translocation and gene activation.
  • Keap1 functions as a substrate-specific adaptor for Cul3-based E3 ubiquitin ligase, mediating Nrf2 ubiquitination.

Conclusions:

  • The Nrf2-Keap1 system is a critical regulator of cellular defense mechanisms.
  • Understanding Nrf2 regulation provides insights into cytoprotective strategies.
  • The conserved nature of the Nrf2-Keap1 system underscores its fundamental biological importance.

Related Concept Videos

NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...