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arXiv · 1902.01254

Gd(III)-Gd(III) RIDME for In-Cell EPR Distance Determination

Mykhailo Azarkh·Anna Bieber·Mian Qi·Jörg W. A. Fischer·Maxim Yulikov·Adelheid Godt·Malte Drescher
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Abstract

In-cell distance determination by EPR reveals essential structural information about biomacromolecules under native conditions. We demonstrate that the pulsed EPR technique RIDME (relaxation induced dipolar modulation enhancement) can be utilized for such distance determination. The performance of in-cell RIDME has been assessed at Q band using stiff molecular rulers labelled with Gd(III)-PyMTA tags and microinjected into X. laevis oocytes. The overtone coefficients are determined to be the same for protonated aqueous solutions and inside cells. As compared to in-cell DEER (double electron-electron resonance, also abbreviated as PELDOR), in-cell RIDME features approximately 5 times larger modulation depth and does not show artificial broadening in the distance distributions due to the effect of pseudo-secular terms.

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Mykhailo Azarkh, Anna Bieber, Mian Qi, Jörg W. A. Fischer, Maxim Yulikov, Adelheid Godt, Malte Drescher. 2019-02-04. Gd(III)-Gd(III) RIDME for In-Cell EPR Distance Determination. https://arxiv.org/abs/1902.01254

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