Molecular Motions and Interactions in Aqueous Solutions of Thymosin-β , Stabilin C-Terminal Domain (CTD) and Their 1:1 Complex Studied by H NMR Spectroscopy.

TitleMolecular Motions and Interactions in Aqueous Solutions of Thymosin-β , Stabilin C-Terminal Domain (CTD) and Their 1:1 Complex Studied by H NMR Spectroscopy.
Publication TypeJournal Article
Year of Publication2018
AuthorsBokor, M., Á. Tantos, A. Meszaros, B. Jenei, R. Haminda, P. Tompa, and K. Tompa
JournalChemphyschem
Volume19
Issue7
Pagination848-856
Date Published2018 Apr 05
ISSN1439-7641
KeywordsCell Adhesion Molecules, Neuronal, Humans, Motion, Peptide Fragments, Protein Structure, Quaternary, Proton Magnetic Resonance Spectroscopy, Thermodynamics, Thymosin, Water
Abstract

Wide-line H NMR measurements were extended and all results were reinterpreted in a new thermodynamics-based approach to study aqueous solutions of thymosin-β (Tβ ), stabilin C-terminal domain (CTD) and their 1:1 complex. The energy distributions of the potential barriers, which control motion of protein-bound water molecules, were determined. Heterogeneous and homogeneous regions were found at the protein-water interface. The measure of heterogeneity gives a quantitative value for the portion of disordered parts in the protein. Ordered structural elements were found extending up to 20 % of the whole proteins. About 40 % of the binding sites of free Tβ become involved in bonds holding the complex together. The complex has the most heterogeneous solvent accessible surface (SAS) in terms of protein-water interactions. The complex is more disordered than Tβ or stabilin CTD. The greater SAS area of the complex is interpreted as a clear sign of its open structure.

DOI10.1002/cphc.201701187
Alternate JournalChemphyschem
PubMed ID29274195
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