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Updated: Jul 13, 2026

Expression and Purification of Nuclease-Free Oxygen Scavenger Protocatechuate 3,4-Dioxygenase
Published on: November 8, 2019
Oxygen-dependent ATF-4 stability is mediated by the PHD3 oxygen sensor.
Jens Köditz1, Jutta Nesper, Marieke Wottawa
1Department of Heart and Circulatory Physiology, Center of Physiology and Pathophysiology, Georg-August University Göttingen, Göttingen, Germany.
Activating transcription factor-4 (ATF-4) protein levels are regulated by oxygen through prolyl-4-hydroxylase domain 3 (PHD3). This oxygen-sensing mechanism influences cell fate and adaptive responses.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Activating transcription factor-4 (ATF-4) is crucial for cell fate and is induced by endoplasmic reticulum stress.
- ATF-4 plays a role in cellular responses to anoxic conditions.
Purpose of the Study:
- To investigate the interaction between ATF-4 and oxygen-sensing pathways.
- To identify the mechanisms regulating ATF-4 protein stability under varying oxygen levels.
Main Methods:
- Co-immunoprecipitation to identify protein interactions.
- Western blotting to assess protein levels.
- Site-directed mutagenesis and siRNA to study protein domains and gene function.
Main Results:
- The zipper II domain of ATF-4 interacts with prolyl-4-hydroxylase domain 3 (PHD3).
- Inhibitors of PHD, hypoxia, and proteasomal inhibition increase ATF-4 protein levels.
- A novel oxygen-dependent degradation (ODD) domain in ATF-4 regulates its stability via PHD3-mediated prolyl hydroxylation.
Conclusions:
- PHD-dependent oxygen-sensing regulates both hypoxia-inducible factor (HIF) and ATF-4 pathways.
- This mechanism impacts cellular adaptive responses and cell fate decisions.
- PHD3 is identified as a key regulator of ATF-4 stability in an oxygen-dependent manner.
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