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Updated: Jul 16, 2026

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
Published on: January 26, 2024
A model of interdomain mobility in a multidomain protein
Yaroslav E Ryabov1, David Fushman
1Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland, College Park, Maryland 20742, USA.
We developed a new NMR model to study protein domain mobility. This model characterizes the structural and dynamic properties of Lys48-linked diubiquitin, revealing domain reorientation crucial for biological function.
Area of Science:
- Biophysics
- Structural Biology
- Biochemistry
Background:
- Protein domain mobility is vital for biological function.
- NMR studies require accounting for interdomain motions alongside other dynamics.
- Lys48-linked diubiquitin's function is influenced by domain interactions.
Purpose of the Study:
- To propose and validate a novel model for interdomain mobility in multidomain proteins.
- To characterize the structural and motional properties of Lys48-linked diubiquitin using NMR.
- To investigate the mechanism controlling conformational state equilibrium in diubiquitin.
Main Methods:
- Development of a new model incorporating domain reorientation as conformational exchange and anisotropic tumbling.
- Analysis of 15N-relaxation data for Lys48-linked diubiquitin at varying pH.
- Comparison of the proposed model with the extended model-free approach.
Main Results:
- The proposed model adequately fits experimental NMR data for diubiquitin.
- Identified domain reorientation on a 9-30 ns timescale with sufficient amplitude for ligand access.
- Protonation of His68 suggested as a key factor in controlling the equilibrium between diubiquitin conformational states.
Conclusions:
- The novel model effectively characterizes multidomain protein dynamics and structural properties.
- Diubiquitin exhibits conformational flexibility essential for biological interactions.
- The study provides insights into the pH-dependent regulation of diubiquitin conformation and function.
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