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Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Published on: December 16, 2013

Conformation-Dependent Hydrogen-Bonding Interactions in a Switchable Artificial Metalloprotein.

Saman Fatima¹, Behzad Mehrafrooz², David G Boggs³

¹Department of Chemistry, Center for Biophysics and Quantitative Biology, Materials Research Laboratory, and the Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, 600 S. Mathews Ave., Urbana, Illinois 61801, United States.

|August 1, 2024

Summary

Researchers engineered switchable artificial metalloproteins (swArMs) to control enzyme function. Specific mutations enhance hydrogen-bonding networks, enabling precise regulation of the metallocofactor microenvironment for biosensing applications.

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Area of Science:

Biochemistry and Biophysics
Protein Engineering
Bioinorganic Chemistry

Background:

Hydrogen-bonding (H-bonding) interactions are crucial for metalloprotein active site regulation.
Understanding how protein conformational changes affect H-bond networks near the metallocofactor is challenging.
Artificial metalloproteins offer a platform to study these complex regulatory mechanisms.

Purpose of the Study:

To develop conformationally switchable artificial metalloproteins (swArMs) with enhanced control over the metallocofactor microenvironment.
To investigate how specific mutations can modulate H-bond interactions in response to allosteric binding.
To create a responsive biological probe for biosensing.

Main Methods:

Design and engineering of conformationally switchable artificial metalloproteins (swArMs).
Structure-informed molecular dynamics simulations to predict beneficial point mutations.
Infrared spectroscopy to analyze changes in the metallocofactor microenvironment.
Allosteric Gln-binding to trigger conformational changes.

Main Results:

Identified three key residues that enhance conformational control over the metallocofactor microenvironment.
Demonstrated that specific mutations preferentially strengthen H-bond interactions in the Gln-bound holo-conformation.
Successfully engineered swArMs exhibiting enhanced Gln-responsive conformational changes.

Conclusions:

Developed a novel strategy to enhance allosteric regulation of metalloprotein active sites.
The engineered swArMs serve as valuable models for biologically relevant structural regulation.
These swArMs represent promising tools for future biosensing applications due to their responsiveness.