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Time-resolved fluorescence studies of flavodoxin. Fluorescence decay and fluorescence anisotropy decay of tryptophan in Desulfovibrio flavodoxins

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Abstract

The time-resolved fluorescence characteristics of tryptophan in flavodoxin isolated from the sulfate-reducing bacteria Desulfovibrio vulgaris and Desulfovibrio gigas have been examined. By comparing the results of protein preparations of normal and FMN-depleted flavodoxin, radiationless energy transfer from tryptophan to FMN has been demonstrated. Since the crystal structure of the D. vulgaris flavodoxin is known, transfer rate constants from the two excited states 1 L a and 1 L b can be calculated for both tryptophan residues (Trp 60 and Trp 140). Residue Trp 60, which is very close to the flavin, transfers energy very rapidly to FMN, whereas the rate of energy transfer from the remote Trp 140 to FMN is much smaller. Both tryptophan residues have the indole rings oriented in such a way that transfer will preferentially take place from the 1 L a excited state. The fluorescence decay of all protein preparations turned out to be complex, the parameter values being dependent on the emission wavelength. Several decay curves were analyzed globally using a model in which tryptophan is involved in some nanosecond relaxation process. A relaxation time of about 2 ns was found for both D. gigas apo- and holoflavodoxin. The fluorescence anisotropy decay of both Desulfovibrio FMN-depleted flavodoxins is exponential, whereas that of the two holoproteins is clearly non-exponential. The anisotropy decay was analyzed using the same model as that applied for fluorescence decay. The tryptophan residues turned out to be immobilized in the protein. A time constant of a few nanoseconds results from energy transfer from tryptophan to flavin, at least for D. gigas flavodoxin. The single tryptophan residue in D. gigas flavodoxin occupies a position in the polypeptide chain remote from the flavin prosthetic group. Because of the close resemblance of steady-state and time-resolved fluorescence properties of tryptophan in both flavodoxins, the center to center distance between tryptophan and FMN in D. gigas flavodoxin is probably very similar to the distance between Trp 140 and FMN in D. vulgaris flavodoxin (i.e. 20 Å).

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  1. Department of Biochemistry, Agricultural University, Dreijenlaan 3, 6703 HA, Wageningen, The Netherlands

    H. R. M. Leenders, J. Vervoort, A. van Hoek & A. J. W. G. Visser

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  1. H. R. M. Leenders
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  2. J. Vervoort
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  3. A. van Hoek
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  4. A. J. W. G. Visser
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Leenders, H.R.M., Vervoort, J., van Hoek, A. et al. Time-resolved fluorescence studies of flavodoxin. Fluorescence decay and fluorescence anisotropy decay of tryptophan in Desulfovibrio flavodoxins. Eur Biophys J 18, 43–55 (1990). https://doi.org/10.1007/BF00185419

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