Histidine Side-chain Dynamics and Protonation Monitored by 13C CPMG NMR Relaxation Dispersion

Overview

Journal J Biomol NMR

Publisher Springer

Specialties Molecular Biology
Nuclear Medicine

Date 2009 Jun 18

PMID 19533375

Citations 6

Authors

Mathias A S Hass

Ali Yilmaz

Hans E M Christensen

Jens J Led

Affiliations

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Abstract

The use of 13C NMR relaxation dispersion experiments to monitor micro-millisecond fluctuations in the protonation states of histidine residues in proteins is investigated. To illustrate the approach, measurements on three specifically 13C labeled histidine residues in plastocyanin (PCu) from Anabaena variabilis (A.v.) are presented. Significant Carr-Purcell-Meiboom-Gill (CPMG) relaxation dispersion is observed for 13C(epsilon1) nuclei in the histidine imidazole rings of A.v. PCu. The chemical shift changes obtained from the CPMG dispersion data are in good agreement with those obtained from the chemical shift titration experiments, and the CPMG derived exchange rates agree with those obtained previously from 15N backbone relaxation measurements. Compared to measurements of backbone nuclei, 13C(epsilon1) dispersion provides a more direct method to monitor interchanging protonation states or other kinds of conformational changes of histidine side chains or their environment. Advantages and shortcomings of using the 13C(epsilon1) dispersion experiments in combination with chemical shift titration experiments to obtain information on exchange dynamics of the histidine side chains are discussed.

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