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NMR Studies of Lysozyme Surface Accessibility by Using Different Paramagnetic Relaxation Probes

Bernini, Andrea and Spiga, Ottavia and Venditti, Vincenzo and Prischi, Filippo and Bracci, Luisa and Tong, Angela Pui-Ling and Wong, Wing-Tak and Niccolai, Neri (2006) 'NMR Studies of Lysozyme Surface Accessibility by Using Different Paramagnetic Relaxation Probes.' Journal of the American Chemical Society, 128 (29). pp. 9290-9291. ISSN 0002-7863

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Paramagnetic probes, whose approach to proteins can be monitored by nuclear magnetic resonance (NMR) studies, have been found to be of primary relevance for investigating protein surfaces' accessibility. Here, a Gd(III) neutral complex which contains two metal ions, [Gd2(L7)(H2O)2], is suggested as a paramagnetic probe particularly suited for systematic NMR investigation of protein surface accessibility, due to an expected high relaxivity and to the lack of electric charge which could favor specific interactions. Hen egg white lysozyme has been used as a model system to verify the absence of preferential approaches of this paramagnetic probe to specific protein moieties by comparing paramagnetic perturbation profiles of1H-13C HSQC signals obtained in the presence of TEMPOL and [Gd2(L7)(H2O)2]. From the similarity of the measured paramagnetic perturbation profiles induced by the two different probes, specific interactions of [Gd2(L7)(H2O)2]with the enzyme could be ruled out. The large size of the latter probe is suggested to be responsible for the strong paramagnetic perturbations observed for CαH groups which are located in convex surface-exposed regions. The combined use of the two probes reveals fine details of the dynamics controlling their approach toward the protein surface. Copyright © 2006 American Chemical Society.

Item Type: Article
Uncontrolled Keywords: Gadolinium; Organometallic Compounds; Muramidase; Electron Spin Resonance Spectroscopy; Molecular Structure; Models, Molecular
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 04 Feb 2016 12:50
Last Modified: 15 Jan 2022 00:30

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