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Biophysical Journal
Article . 2020 . Peer-reviewed
License: CC BY NC ND
Data sources: Crossref
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Biophysical Journal
Article
License: CC BY NC ND
Data sources: UnpayWall
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PubMed Central
Other literature type . 2020
License: CC BY NC ND
Data sources: PubMed Central
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Chemical Exchange at the Trinuclear Copper Center of Small Laccase from Streptomyces coelicolor

Authors: Dasgupta, Rubin; Gupta, Karthick B.S.S.; Nami, Faezeh; de Groot, Huub J.M.; Canters, Gerard W.; Groenen, Edgar J.J.; Ubbink, Marcellus;

Chemical Exchange at the Trinuclear Copper Center of Small Laccase from Streptomyces coelicolor

Abstract

The trinuclear copper center (TNC) of laccase reduces oxygen to water with very little overpotential. The arrangement of the coppers and ligands in the TNC is known to be from many crystal structures, yet information about possible dynamics of the ligands is absent. Here, we report dynamics at the TNC of small laccase from Streptomyces coelicolor using paramagnetic NMR and electron paramagnetic resonance spectroscopy. Fermi contact-shifted resonances tentatively assigned to histidine Hδ1 display a two-state chemical exchange with exchange rates in the order of 100 s-1. In the electron paramagnetic resonance spectra, at least two forms are observed with different gz-values. It is proposed that the exchange processes reflect the rotational motion of histidine imidazole rings that coordinate the coppers in the TNC.

Related Organizations
Keywords

Magnetic Resonance Spectroscopy, Biophysical Letter, Laccase, Electron Spin Resonance Spectroscopy, Streptomyces coelicolor, Copper

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
18
Top 10%
Average
Top 10%
Green
hybrid