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Cluster and fold stability of E. coli ISC-type ferredoxin
Robert Yan1, Salvatore Adinolfi, Clara Iannuzzi
1Division of Molecular Structure, National Institute for Medical Research of the Medical Research Council, London, United Kingdom.
E. coli ferredoxin stability and dynamics were studied. The iron-sulfur cluster is crucial for protein function, acting as a switch between active and inactive states, and is sensitive to oxygen.
Area of Science:
- Biochemistry
- Protein Structure and Dynamics
Background:
- Iron-sulfur clusters are vital prosthetic groups enabling redox potential in metabolic pathways.
- Protein-bound iron-sulfur clusters are assembled by a specialized machinery including ferredoxins.
Purpose of the Study:
- To investigate the stability and dynamic properties of E. coli ferredoxin.
- To elucidate the role of ferredoxin in iron-sulfur cluster assembly.
Main Methods:
- Spectroscopic techniques
- Nuclear Magnetic Resonance (NMR) relaxation experiments
Main Results:
- Cluster-loaded E. coli ferredoxin is monomeric, well-structured with a flexible C-terminus.
- The protein is highly oxygen-sensitive, losing its cluster and unfolding irreversibly under aerobic conditions.
- Reducing conditions and high ionic strength stabilize the protein against cluster loss.
- NMR data indicate a rigid, globular domain upon cluster incorporation.
Conclusions:
- The iron-sulfur cluster acts as a molecular switch, determining the functional state of E. coli ferredoxin.
- Protein stability and dynamics are intrinsically linked to the presence and integrity of the iron-sulfur cluster.
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