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Multimodal Response to Copper Binding in Superoxide Dismutase Dynamics. | LitMetric

Multimodal Response to Copper Binding in Superoxide Dismutase Dynamics.

J Am Chem Soc

Centre de RMN à Très Hauts Champs, FRE 2034 (CNRS/Université Claude Bernard Lyon 1/Ecole Normale Supérieure de Lyon), University of Lyon, 69100 Villeurbanne, France.

Published: November 2020

AI Article Synopsis

Article Abstract

Copper/zinc superoxide dismutase (SOD) is a homodimeric metalloenzyme that has been extensively studied as a benchmark for structure-function relationships in proteins, in particular because of its implication in the familial form of the neurodegenerative disease amyotrophic lateral sclerosis. Here, we investigate microcrystalline preparations of two differently metalated forms of SOD, namely, the fully mature functional Cu,Zn state and the E,Zn-SOD state in which the Cu site is empty. By using solid-state NMR with fast magic-angle spinning (MAS) at high magnetic fields (H Larmor frequency of 800-1000 MHz), we quantify motions spanning a dynamic range from ns to ms. We determine that metal ion uptake does not act as a rigidification element but as a switch redistributing motional processes on different time scales, with coupling of the dynamics of histidine side chains and those of remote key backbone elements of the protein.

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Source
http://dx.doi.org/10.1021/jacs.0c09242DOI Listing

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