Abstract
Stable bioradical reporters can be generated by attaching a nitroxide spin label group covalently to biomolecules. The conventional electron spin resonance (ESR) spectra are sensitive to rotational motions of the spin label in the 10-11-10-8 s time regime (determined by the T2-relaxation time), and the saturation transfer ESR spectra are sensitive to molecular rotation on the 10-8-10-3 s timescale (determined by the T1-relaxation time). Applications of conventional spin label ESR include the study of lipid mobility in biological membranes, particularly of lipid-protein interactions, and of conformational changes in proteins. Applications of saturation transfer ESR (STESR) spectroscopy are confined almost exclusively to spin label studies, and include the determination of rotational diffusion rates (and hence the state of oligomeric association) of integral proteins in membranes, and of supramolecular assemblies of biomolecules.
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References
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© 1995 Birkhäuser Verlag
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Marsh, D. (1995). Recent developments in spin labeling. In: Ohya-Nishiguchi, H., Packer, L. (eds) Bioradicals Detected by ESR Spectroscopy. MCBU Molecular and Cell Biology Updates. Birkhäuser Basel. https://doi.org/10.1007/978-3-0348-9059-5_13
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DOI: https://doi.org/10.1007/978-3-0348-9059-5_13
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