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Distance measurements in the borderline region of applicability of CW EPR and DEER: A model study on a homologous series of spin-labelled peptides

journal contribution
posted on 2023-06-07, 23:09 authored by J E Banham, C M Baker, S Ceola, Iain Day, G H Grant, E J J Groenen, C T Rodgers, G Jeschke, C R Timmel
Inter-spin distances between 1 nm and 4.5 nm are measured by continuous wave (CW) and pulsed electron paramagnetic resonance (EPR) methods for a series of nitroxide-spin-labelled peptides. The upper distance limit for measuring dipolar coupling by the broad- ening of the CW spectrum and the lower distance limit for the present optimally-adjusted double electron electron resonance (DEER) set-up are determined and found to be both around 1.61.9 nm. The methods for determining distances and corresponding distributions from CW spectral line broadening are reviewed and further developed. Also, the work shows that a correction factor is required for the analysis of inter-spin distances below approximately 2 nm for DEER measurements and this is calculated using the density matrix formalism.

History

Publication status

  • Published

Journal

Journal of Magnetic Resonance

ISSN

1090-7807

Publisher

Elsevier

Issue

2

Volume

191

Page range

202-218

Department affiliated with

  • Chemistry Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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