Volume 55, Issue 23 pp. 6638-6641
Communication

Weak and Transient Protein Interactions Determined by Solid-State NMR

Dr. Hugh R. W. Dannatt

Dr. Hugh R. W. Dannatt

Centre de RMN à Très Hauts Champs—, Université de Lyon, Institut de Sciences Analytiques (CNRS/ ENS-Lyon/ UCB Lyon 1), 69100 Villeurbanne, France

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Michele Felletti

Michele Felletti

Centre de RMN à Très Hauts Champs—, Université de Lyon, Institut de Sciences Analytiques (CNRS/ ENS-Lyon/ UCB Lyon 1), 69100 Villeurbanne, France

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Dr. Stefan Jehle

Dr. Stefan Jehle

Centre de RMN à Très Hauts Champs—, Université de Lyon, Institut de Sciences Analytiques (CNRS/ ENS-Lyon/ UCB Lyon 1), 69100 Villeurbanne, France

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Yao Wang

Yao Wang

Centre for Medical and Molecular Bioscience, School of Chemistry, University of Wollongong, Wollongong, New South Wales, 2522 Australia

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Prof. Lyndon Emsley

Prof. Lyndon Emsley

Centre de RMN à Très Hauts Champs—, Université de Lyon, Institut de Sciences Analytiques (CNRS/ ENS-Lyon/ UCB Lyon 1), 69100 Villeurbanne, France

Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Prof. Nicholas E. Dixon

Prof. Nicholas E. Dixon

Centre for Medical and Molecular Bioscience, School of Chemistry, University of Wollongong, Wollongong, New South Wales, 2522 Australia

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Dr. Anne Lesage

Dr. Anne Lesage

Centre de RMN à Très Hauts Champs—, Université de Lyon, Institut de Sciences Analytiques (CNRS/ ENS-Lyon/ UCB Lyon 1), 69100 Villeurbanne, France

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Dr. Guido Pintacuda

Corresponding Author

Dr. Guido Pintacuda

Centre de RMN à Très Hauts Champs—, Université de Lyon, Institut de Sciences Analytiques (CNRS/ ENS-Lyon/ UCB Lyon 1), 69100 Villeurbanne, France

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First published: 21 April 2016
Citations: 28

Graphical Abstract

In a spin: A solid-state NMR approach based on high magnetic fields, fast magic-angle spinning, and deuteration was used to provide chemical-shift and relaxation mapping for characterizing the transient association between two regions in a 80 kDa protein assembly, the homotetrameric ssDNA-binding protein (SSB). Comparison of the wildtype (wt) and the truncated mutant SSBΔCt led to direct verification of a mechanism of regulation of E. coli DNA metabolism.

Abstract

Despite their roles in controlling many cellular processes, weak and transient interactions between large structured macromolecules and disordered protein segments cannot currently be characterized at atomic resolution by X-ray crystallography or solution NMR. Solid-state NMR does not suffer from the molecular size limitations affecting solution NMR, and it can be applied to molecules in different aggregation states, including non-crystalline precipitates and sediments. A solid-state NMR approach based on high magnetic fields, fast magic-angle sample spinning, and deuteration provides chemical-shift and relaxation mapping that enabled the characterization of the structure and dynamics of the transient association between two regions in an 80 kDa protein assembly. This led to direct verification of a mechanism of regulation of E. coli DNA metabolism.

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