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Resonance Raman spectroscopic study of the neutral flavin radical complex of DNA photolyase from Escherichia coli
Zitatschlüssel ISI:000170359700015
Autor Murgida, D H and Schleicher, E and Bacher, A and Richter, G and Hildebrandt, P
Seiten 551-556
Jahr 2001
ISSN 0377-0486
Adresse BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND
Journal J. Raman Spec.
Jahrgang 32
Nummer 6-7
Monat JUN-JUL
Verlag JOHN WILEY & SONS LTD
Zusammenfassung The neutral Ravin radical complex of DNA photolyase from Escherichia coli was studied by resonance Raman spectroscopy for the first time. The experiments were carried out with enzyme variants that lack the light-harvesting methenyltetrahydrofolate cofactor so that the resonance Raman spectra exclusively display the vibrational bands of the Ravin radical in the catalytic site. Spectral changes induced upon H-D exchange and upon substituting the natural flavin by its N-15-labelled isotopomer allow a tentative assignment of the prominent bands in the region between 1200 and 1650 cm(-1). It is shown that most of the bands observed with 568 run excitation originate from modes localized in the isoalloxazine ring. In conjunction with previous data on flavin radicals, the present results allow the identification of the marker bands that appear to be particularly sensitive towards changes in the electron density distribution of this ring and, hence, reflect the specific intermolecular interactions in the catalytic site. Copyright (C) 2001 John Wiley & Sons, Ltd.
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