Unknown

Dataset Information

0

Extending electron paramagnetic resonance to nanoliter volume protein single crystals using a self-resonant microhelix.


ABSTRACT: Electron paramagnetic resonance (EPR) spectroscopy on protein single crystals is the ultimate method for determining the electronic structure of paramagnetic intermediates at the active site of an enzyme and relating the magnetic tensor to a molecular structure. However, crystals of dimensions typical for protein crystallography (0.05 to 0.3mm) provide insufficient signal intensity. In this work, we present a microwave self-resonant microhelix for nanoliter samples that can be implemented in a commercial X-band (9.5 GHz) EPR spectrometer. The self-resonant microhelix provides a measured signal-to-noise improvement up to a factor of 28 with respect to commercial EPR resonators. This work opens up the possibility to use advanced EPR techniques for studying protein single crystals of dimensions typical for x-ray crystallography. The technique is demonstrated by EPR experiments on single crystal [FeFe]-hydrogenase (Clostridium pasteurianum; CpI) with dimensions of 0.3 mm by 0.1 mm by 0.1 mm, yielding a proposed g-tensor orientation of the Hox state.

SUBMITTER: Sidabras JW 

PROVIDER: S-EPMC6777973 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

altmetric image

Publications

Extending electron paramagnetic resonance to nanoliter volume protein single crystals using a self-resonant microhelix.

Sidabras Jason W JW   Duan Jifu J   Winkler Martin M   Happe Thomas T   Hussein Rana R   Zouni Athina A   Suter Dieter D   Schnegg Alexander A   Lubitz Wolfgang W   Reijerse Edward J EJ  

Science advances 20191004 10


Electron paramagnetic resonance (EPR) spectroscopy on protein single crystals is the ultimate method for determining the electronic structure of paramagnetic intermediates at the active site of an enzyme and relating the magnetic tensor to a molecular structure. However, crystals of dimensions typical for protein crystallography (0.05 to 0.3mm) provide insufficient signal intensity. In this work, we present a microwave self-resonant microhelix for nanoliter samples that can be implemented in a c  ...[more]

Similar Datasets

| S-EPMC7608791 | biostudies-literature
| S-EPMC4096354 | biostudies-literature
| S-EPMC6648812 | biostudies-literature
| S-EPMC3839053 | biostudies-literature
| S-EPMC4144713 | biostudies-literature
| S-EPMC7278021 | biostudies-literature
| S-EPMC8154605 | biostudies-literature
| S-EPMC1989693 | biostudies-literature
| S-EPMC6750836 | biostudies-literature
| S-EPMC10560202 | biostudies-literature