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Lanmodulin's EF 2-3 Domain: Insights from Infrared Spectroscopy and Simulations
Eman A Alasadi1, Wonseok Choi2, Xiaobing Chen1
1Department of Chemistry, University of Texas at Austin, 105 E 24th St. A5300, Austin, Texas 78712, United States.
ACS Chemical Biology
|April 15, 2024
Summary
Lanmodulins bind lanthanide ions with high affinity. This study reveals the EF 2-3 domain
Area of Science:
- Biochemistry
- Structural Biology
- Spectroscopy
Background:
- Lanmodulins are proteins with high affinity for lanthanide ions.
- Lanthanides are crucial for technological applications.
- Understanding metal-protein interactions is key for metal recovery.
Purpose of the Study:
- To investigate the thermodynamic and structural aspects of lanthanide binding to the EF 2-3 domain of lanmodulin.
- To characterize the binding capabilities of this specific protein domain.
Main Methods:
- Circular Dichroism (CD) spectroscopy
- Isothermal Titration Calorimetry (ITC)
- Two-dimensional Infrared (2D IR) spectroscopy
- Molecular Dynamics (MD) simulations
- Europium (Eu3+) luminescence measurements
Main Results:
- Lanthanide binding to EF 2-3 occurred with dissociation constants (Kd) in the 20-30 μM range for La3+, Eu3+, and Tb3+.
- CD spectroscopy indicated a significant conformational change in only one binding site upon lanthanide addition.
- 2D IR spectroscopy revealed both mono- and bidentate binding configurations.
- MD simulations and luminescence data suggested competition between water-lanthanide and carboxylate-lanthanide interactions.
Conclusions:
- The EF 2-3 domain exhibits moderate lanthanide binding affinity.
- Protein architecture, specifically the core helical bundle, influences binding affinity and communication between sites.
- These findings contribute to understanding lanmodulin's role in lanthanide ion recovery.
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