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Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
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The ErpA/NfuA complex builds an oxidation-resistant Fe-S cluster delivery pathway
Béatrice Py1,2,3, Catherine Gerez4,5,6, Allison Huguenot7,2,3
1From the Institut de Microbiologie de la Méditerranée, 13009 Marseille, France, py@imm.cnrs.fr.
The Journal of Biological Chemistry
|April 8, 2018
Summary
Iron-sulfur (Fe-S) cluster carriers NfuA and ErpA are crucial for protein targeting under oxidative stress. NfuA enhances ErpA
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Iron-sulfur (Fe-S) clusters are vital cofactors involved in numerous cellular processes, including metabolism, DNA repair, gene expression, and bioenergetics.
- The delivery and targeting of Fe-S clusters to client proteins are essential for cellular function, especially under conditions of oxidative stress.
Purpose of the Study:
- To investigate the roles of four Fe-S cluster carriers (NfuA, SufA, ErpA, and IscA) in Fe-S cluster targeting under oxidative stress.
- To determine the stability of Fe-S clusters bound to different carriers and identify interactions between carriers and client proteins.
Main Methods:
- In vitro and in vivo experiments were conducted to assess Fe-S cluster carrier function.
- Protein half-life measurements, genetic analyses, and surface plasmon resonance (SPR) were employed to study Fe-S cluster stability and protein interactions.
Main Results:
- Fe-S clusters exhibited varying stabilities depending on the carrier, with NfuA-bound clusters being the most stable (100 min).
- NfuA significantly enhanced the stability of ErpA-bound Fe-S clusters (to 90 min).
- NfuA and ErpA directly interacted with client proteins and with each other, while IscA and SufA did not directly interact with client proteins.
Conclusions:
- A model for the Fe-S delivery network is proposed, where ErpA acts as the primary direct Fe-S cluster donor to client proteins.
- NfuA likely supports ErpA function under severe oxidative stress conditions.
- The findings provide insights into Fe-S cluster trafficking mechanisms and their regulation, with implications for understanding cellular responses to stress and potential comparisons with eukaryotic systems.
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