The Transient Complex of Cytochrome C and Cytochrome C Peroxidase: Insights into the Encounter Complex from Multifrequency EPR and NMR Spectroscopy

Overview

Journal Chemphyschem

Specialty Chemistry

Date 2020 Apr 18

PMID 32301564

Citations 2

Authors

Martin van Son

Jesika T Schilder

Antonella Di Savino

Anneloes Blok

Marcellus Ubbink

Martina Huber

Affiliations

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Abstract

We present a novel approach to study transient protein-protein complexes with standard, 9 GHz, and high-field, 95 GHz, electron paramagnetic resonance (EPR) and paramagnetic NMR at ambient temperatures and in solution. We apply it to the complex of yeast mitochondrial iso-1-cytochrome c (Cc) with cytochrome c peroxidase (CcP) with the spin label [1-oxyl-2,2,5,5-tetramethyl-Δ3-pyrroline-3-methyl)-methanethiosulfonate] attached at position 81 of Cc (SL-Cc). A dissociation constant K of 20±4×10 M (EPR and NMR) and an equal amount of stereo-specific and encounter complex (NMR) are found. The EPR spectrum of the fully bound complex reveals that the encounter complex has a significant population (60 %) that shares important features, such as the Cc-interaction surface, with the stereo-specific complex.

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The Transient Complex of Cytochrome c and Cytochrome c Peroxidase: Insights into the Encounter Complex from Multifrequency EPR and NMR Spectroscopy.

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