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XB-ART-54562
Angew Chem Int Ed Engl 2017 Jan 02;561:177-181. doi: 10.1002/anie.201609085.
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Versatile Trityl Spin Labels for Nanometer Distance Measurements on Biomolecules In Vitro and within Cells.

Jassoy JJ , Berndhäuser A , Duthie F , Kühn SP , Hagelueken G , Schiemann O .


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Structure determination of biomacromolecules under in-cell conditions is a relevant yet challenging task. Electron paramagnetic resonance (EPR) distance measurements in combination with site-directed spin labeling (SDSL) are a valuable tool in this endeavor but the usually used nitroxide spin labels are not well-suited for in-cell measurements. In contrast, triarylmethyl (trityl) radicals are highly persistent, exhibit a long relaxation time and a narrow spectral width. Here, the synthesis of a versatile collection of trityl spin labels and their application in in vitro and in-cell trityl-iron distance measurements on a cytochrome P450 protein are described. The trityl labels show similar labeling efficiencies and better signal-to-noise ratios (SNR) as compared to the popular methanethiosulfonate spin label (MTSSL) and enabled a successful in-cell measurement.

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Species referenced: Xenopus laevis
Genes referenced: cyp4b1