The application of magnetic resonance methods in biophysics frequently depends on the labeling of the investigated probes with suitable isotopes. In this work, several flavoproteins (DNA photolyase, flavodoxin, recombinant LOV domains from the blue light receptor phototropin) were labeled with 13C, 15N, 17O, and/or 18O-isotopologues of the flavocoenzymes FMN and FAD. In addition, LOV domains were labeled completely or partially with 13C. 13C-NMR-spectra of the isotope-labeled LOV domains under blue light irradiation show emissive signals for FMN and for the tryptophan residues 491 and 557, which are due to polarization transfer in photochemically induced radical states. ENDOR investigations of all proteins specified above, done in co-operation with Dr. Stefan Weber, enabled for the first time the complete assignment of the hyperfine coupling constants for flavocoenzymes in complex with the investigated flavoproteins.
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The application of magnetic resonance methods in biophysics frequently depends on the labeling of the investigated probes with suitable isotopes. In this work, several flavoproteins (DNA photolyase, flavodoxin, recombinant LOV domains from the blue light receptor phototropin) were labeled with 13C, 15N, 17O, and/or 18O-isotopologues of the flavocoenzymes FMN and FAD. In addition, LOV domains were labeled completely or partially with 13C. 13C-NMR-spectra of the isotope-labeled LOV domains under b...
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