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An Aerobic in Vitro Cell Lysate-based Method for Fe-S Cluster Reconstitution in Recombinant Rv1460 Protein from
1Department of Life Sciences, Shiv Nadar IoE (Deemed to be University), NH-91, Gautam Buddha Nagar, Greater Noida, Uttar Pradesh, 201314, India.
Applied Biochemistry and Biotechnology
|June 15, 2026
Summary
Researchers developed a new aerobic method for incorporating iron-sulfur (Fe-S) clusters into recombinant proteins. This cell lysate-based approach simplifies Fe-S cluster synthesis, avoiding strict anaerobic conditions and enabling cost-effective protein production.
Area of Science:
- Biochemistry
- Protein Engineering
- Molecular Biology
Background:
- Iron-sulfur (Fe-S) clusters are vital cofactors for numerous proteins.
- Recombinant Fe-S protein production is challenging due to the need for strict anaerobic conditions for cluster incorporation.
- Existing methods are often complex, costly, and require specialized equipment.
Purpose of the Study:
- To develop a modified, aerobic in vitro method for Fe-S cluster reconstitution in recombinant proteins.
- To utilize a cell lysate-based approach, leveraging endogenous host factors for Fe-S cluster synthesis.
- To demonstrate the method's efficacy using Rv1460, a 4Fe-4S binding protein from Mycobacterium tuberculosis.
Main Methods:
- A cell lysate-based approach was employed, adding iron and sulfur sources post-sonication.
- Fe-S cluster incorporation occurred in the presence of endogenous host cell chaperones and factors.
- Purification was achieved via affinity chromatography under aerobic conditions.
Main Results:
- Successful Fe-S cluster incorporation was confirmed using various spectroscopic and thermal analyses (UV-Visible, MALDI-TOF, CD, DSC, FTIR, Thermogravimetry).
- The reconstituted Rv1460 protein maintained DNA-binding activity for at least 6 hours.
- The protein retained long-term functionality after storage at -80°C.
Conclusions:
- The developed aerobic, cell lysate-based strategy simplifies Fe-S cluster incorporation, eliminating the need for anaerobic chambers.
- This cost-effective method yields functionally active Fe-S proteins under near-physiological conditions.
- The approach holds potential for purifying and characterizing other Fe-S containing proteins across various organisms.
