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Related Experiment Video

Updated: May 25, 2026

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Published on: March 5, 2019

PALB2 interacts with KEAP1 to promote NRF2 nuclear accumulation and function.

Jianglin Ma¹, Hong Cai, Tongde Wu

¹Department of Radiation Oncology, The Cancer Institute of New Jersey, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, USA.

Molecular and Cellular Biology

|February 15, 2012

Summary

The study reveals that PALB2 interacts with KEAP1, regulating the antioxidant factor NRF2. This interaction impacts cellular oxidative stress, linking DNA repair to cancer and Fanconi anemia (FA).

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Last Updated: May 25, 2026

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Published on: March 5, 2019

Area of Science:

Molecular Biology
Cancer Research
Genetics

Background:

PALB2 (partner and localizer of BRCA2) is crucial for DNA repair, particularly homologous recombination.
Mutations in PALB2 are associated with breast and pancreatic cancers, as well as Fanconi anemia (FA).
BRCA1 and BRCA2 proteins are key players in DNA repair and tumor suppression, with PALB2 linking them.

Purpose of the Study:

To investigate the novel interaction between PALB2 and KEAP1 (Kelch-like ECH-associated protein 1).
To elucidate the role of PALB2 in regulating the nuclear factor erythroid 2-related factor 2 (NRF2) pathway.
To understand how PALB2 influences cellular redox homeostasis and its implications in cancer and FA.

Main Methods:

Protein-protein interaction assays to confirm PALB2-KEAP1 binding.
Western blotting to assess NRF2 protein levels and nuclear localization.
Measurement of reactive oxygen species (ROS) levels.
Analysis of NRF2 nuclear export dynamics.

Main Results:

PALB2 directly binds to KEAP1, a sensor for oxidative stress.
PALB2 competes with NRF2 for binding to KEAP1, promoting NRF2 accumulation in the nucleus.
PALB2 reduces cellular reactive oxygen species (ROS) levels.
PALB2 influences the rate of NRF2 nuclear export.

Conclusions:

PALB2 acts as a regulator of cellular redox homeostasis by modulating the NRF2 pathway.
This discovery establishes a new connection between oxidative stress, DNA repair mechanisms, and the pathogenesis of cancer and Fanconi anemia.
The findings highlight PALB2's multifaceted role beyond its known function in DNA repair.