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Author Spotlight: A Computational Approach to Decipher Amino Acid Preferences in Multispecific Protein-Protein Interactions
Published on: January 26, 2024
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Designed leucine-rich repeat proteins bind two muramyl dipeptide ligands.
Christina S Kim1, Anne M Brown2, Tijana Z Grove1
1Department of Chemistry, Virginia Tech, Blacksburg, Virginia, USA.
Protein Science : a Publication of the Protein Society
|January 29, 2021
Summary
We designed novel consensus leucine-rich repeat proteins (CLRR4-8) that bind bacterial muramyl dipeptide (MDP) with high affinity. These proteins show potential for developing advanced pathogen biosensors.
Area of Science:
- Protein Engineering
- Immunology
- Biochemistry
Background:
- Designed protein receptors offer potential for diagnostics and therapeutics.
- Nucleotide-binding oligomerization domain (NOD)-like receptors are key in innate immunity.
- Muramyl dipeptide (MDP) is a critical component of bacterial cell walls.
Purpose of the Study:
- To design novel consensus leucine-rich repeat proteins (CLRR4-8).
- To investigate the binding affinity and capacity of these CLRRs for MDP.
- To explore the potential of CLRRs as scaffolds for pathogen biosensors.
Main Methods:
- Protein design based on NOD-like receptor LRR domains.
- Fluorescence quenching experiments to measure binding affinity (Kd app, Kd1, Kd2).
- Molecular docking studies to analyze MDP binding modes.
Main Results:
- Five CLRRs (CLRR4-8) were successfully designed.
- CLRRs exhibited micromolar affinity for MDP, with Kd app values from 1.0 to 57 μM.
- Biphasic binding curves indicated high-capacity binding, with Kd1 values from 0.04 to 4.5 μM and Kd2 from 3.1 to 227 μM, suggesting dual MDP binding.
Conclusions:
- Designed CLRRs demonstrate high-capacity binding of MDP, exceeding previously reported single-binding.
- The small, soluble, and stable CLRR scaffolds are promising for future pathogen biosensor development.
- This work advances protein engineering for innate immune system components and biosensing applications.
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