DEER and RIDME measurements of the nitroxide-spin labelled copper-bound amine oxidase homodimer from arthrobacter globiformis

In the study of biological structures, pulse dipolar spectroscopy (PDS) is used to elucidate spin–spin distances at nanometre-scale by measuring dipole–dipole interactions between paramagnetic centres. The PDS methods of Double Electron Electron Resonance (DEER) and Relaxation Induced Dipolar Modulation Enhancement (RIDME) are employed, and their results compared, for the measurement of the dipolar coupling between nitroxide spin labels and copper-II (Cu(II)) paramagnetic centres within the copper amine oxidase from Arthrobacter globiformis (AGAO). The distance distribution results obtained indicate that two distinct distances can be measured, with the longer of these at c.a. 5 nm. Conditions for optimising the RIDME experiment such that it may outperform DEER for these long distances are discussed. Modelling methods are used to show that the distances obtained after data analysis are consistent with the structure of AGAO.

Citation

Russell , H , Stewart , R , Prior , C , Oganesyan , V S , Gaule , T G & Lovett , J E 2021 , ' DEER and RIDME measurements of the nitroxide-spin labelled copper-bound amine oxidase homodimer from arthrobacter globiformis ' , Applied Magnetic Resonance , vol. First Online . https://doi.org/10.1007/s00723-021-01321-6

Publication

Applied Magnetic Resonance

Status

Peer reviewed

DOI

https://doi.org/10.1007/s00723-021-01321-6

ISSN

0937-9347

Type

Journal article

Rights

Copyright © The Author(s) 2021. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Description

Authors acknowledge financial support from EPSRC (studentship to HR EP/R513337/1, Grant support to VSO EP/P007554/1, Grant support to TGG EP/L015005/1), The Royal Society (URF to JEL URF150698), and The Wellcome Trust for a multi-user equipment grant (099149/Z/12/Z).