Cross-validation of Distance Measurements in Proteins by PELDOR/DEER and Single-molecule FRET

Overview

Journal Nat Commun

Specialty Biology

Date 2022 Jul 29

PMID 35906222

Authors

Martin F Peter

Christian Gebhardt

Rebecca Machtel

Gabriel G Moya Munoz

Janin Glaenzer

Alessandra Narducci

Gavin H Thomas

Thorben Cordes

Gregor Hagelueken

Affiliations

Soon will be listed here.

Abstract

Pulsed electron-electron double resonance spectroscopy (PELDOR/DEER) and single-molecule Förster resonance energy transfer spectroscopy (smFRET) are frequently used to determine conformational changes, structural heterogeneity, and inter probe distances in biological macromolecules. They provide qualitative information that facilitates mechanistic understanding of biochemical processes and quantitative data for structural modelling. To provide a comprehensive comparison of the accuracy of PELDOR/DEER and smFRET, we use a library of double cysteine variants of four proteins that undergo large-scale conformational changes upon ligand binding. With either method, we use established standard experimental protocols and data analysis routines to determine inter-probe distances in the presence and absence of ligands. The results are compared to distance predictions from structural models. Despite an overall satisfying and similar distance accuracy, some inconsistencies are identified, which we attribute to the use of cryoprotectants for PELDOR/DEER and label-protein interactions for smFRET. This large-scale cross-validation of PELDOR/DEER and smFRET highlights the strengths, weaknesses, and synergies of these two important and complementary tools in integrative structural biology.

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