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Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro

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The SufBCD Fe-S scaffold complex interacts with SufA for Fe-S cluster transfer.

Harsimranjit K Chahal¹, Yuyuan Dai, Avneesh Saini

¹Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, South Carolina 29208, USA.

|October 9, 2009

Summary

Iron-sulfur (Fe-S) clusters are vital for cellular processes. This study reveals the SufBCD complex acts as a scaffold for Fe-S cluster assembly in E. coli, transferring them to the SufA shuttle protein.

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Area of Science:

Biochemistry
Molecular Biology
Microbiology

Background:

Iron-sulfur (Fe-S) clusters are essential cofactors in numerous biological pathways, including nitrogen fixation and respiration.
In vivo Fe-S cluster assembly requires complex, multiprotein biosynthetic pathways due to the toxicity of iron and sulfide.
The SufABCDSE pathway in Escherichia coli is a stress-responsive system for Fe-S cluster assembly under conditions of iron starvation and oxidative stress.

Purpose of the Study:

To elucidate the specific roles of the SufBCD complex and SufA protein in the Suf Fe-S cluster biosynthesis pathway.
To investigate the mechanism of nascent Fe-S cluster formation and transfer within the Suf pathway.

Main Methods:

Protein-protein interaction assays were employed to study complex formation.
In vitro Fe-S cluster assembly assays were conducted to analyze the biochemical processes.
Characterization of the SufABCDSE pathway in Escherichia coli.

Main Results:

SufA was shown to interact with the SufBCD complex.
Fe-S clusters are assembled de novo on the SufBCD complex.
SufA accepts Fe-S clusters from the SufBCD complex, functioning as an Fe-S shuttle.

Conclusions:

The SufBCD complex serves as a novel scaffold for the assembly of nascent Fe-S clusters.
The SufBCD complex transfers newly formed Fe-S clusters to the SufA protein for subsequent delivery.
This study provides the first biochemical evidence for the scaffold function of SufBCD in Fe-S cluster biosynthesis.