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Redox-dependent structural changes in archaeal and bacterial Rieske-type [2Fe-2S] clusters.
Nathaniel J Cosper1, D Matthew Eby, Asako Kounosu
1Center for Metalloenzyme Studies, University of Georgia, Athens 30602, USA. ncosper@uga.edu
Protein Science : a Publication of the Protein Society
|November 21, 2002
Summary
Rieske proteins use iron-sulfur clusters for electron transfer. Reduction causes a slight iron-histidine bond lengthening, optimizing protein interactions for efficient oxygenase reactions.
Area of Science:
- Biochemistry
- Structural Biology
- Bioinorganic Chemistry
Background:
- Rieske-type [2Fe-2S] clusters are crucial for biological electron transfer.
- These clusters typically supply electrons to active sites rather than directly catalyzing reactions.
Purpose of the Study:
- To investigate the structural changes in Rieske-type clusters upon reduction.
- To understand how these changes facilitate electron transfer and regulate oxygenase activity.
Main Methods:
- X-ray absorption spectroscopy (XAS) was employed to study the electronic and structural properties.
- The study focused on archaeal Rieske ferredoxin and bacterial anthranilate dioxygenases.
Main Results:
- XAS data revealed an average increase of at least 0.1 Å in iron-histidine bond length upon reduction.
- This structural change was observed in both archaeal and bacterial Rieske clusters.
Conclusions:
- Redox-dependent structural changes in Rieske clusters fine-tune protein interactions.
- These modifications facilitate rapid electron transfer, regulating oxygenase reaction pathways.