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Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET

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Time-resolved tryptophan fluorescence in flavodoxins.

R Leenders¹, J Roslund, A J Visser

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

Journal of Fluorescence

|November 15, 2013

Summary

This summary is machine-generated.

Tryptophan fluorescence in bacterial flavodoxins reveals energy transfer from tryptophan to flavin. Studies also indicate the presence of apoprotein in all holoflavodoxin samples, impacting protein structure and function.

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Area of Science:

Biochemistry
Biophysics
Microbiology

Background:

Flavodoxins are crucial electron transport proteins in various bacteria.
Tryptophan fluorescence provides insights into protein structure and dynamics.
Understanding energy transfer mechanisms is key to flavodoxin function.

Purpose of the Study:

To investigate the time-resolved fluorescence of tryptophan in bacterial flavodoxins.
To determine the occurrence and characteristics of energy transfer from tryptophan to flavin.
To assess the presence of apoprotein in holoflavodoxin samples.

Main Methods:

Time-resolved fluorescence spectroscopy using pulsed synchrotron radiation.
Time-correlated single-photon counting detection.
Maximum entropy method for analyzing fluorescence decay lifetime distributions.

Main Results:

Radiationless energy transfer from tryptophan to flavin was confirmed in all investigated flavodoxins.
Apoprotein was detected in all holoflavodoxin samples studied.
Experimental and theoretical energy transfer rates showed fair agreement for two flavodoxins.

Conclusions:

Tryptophan-to-flavin energy transfer is a conserved feature in these bacterial flavodoxins.
The presence of apoprotein suggests potential heterogeneity or assembly intermediates in flavodoxin preparations.
Fluorescence spectroscopy is a valuable tool for characterizing flavodoxin structure and function.