Light-generated paramagnetic intermediates in BLUF domains

Weber, S., Schroeder, C., Kacprzak, S., Mathes, T., Kowalczyk, R. M. ORCID: https://orcid.org/0000-0002-3926-6530, Essen, L.-O., Hegemann, P., Schleicher, E. and Bittl, R. (2011) Light-generated paramagnetic intermediates in BLUF domains. Photochemistry and Photobiology, 87 (3). pp. 574-583. ISSN 1751-1097 doi: 10.1111/j.1751-1097.2010.00885.x

Abstract/Summary

Blue-light sensitive photoreceptory BLUF domains are flavoproteins, which regulate various, mostly stress-related processes in bacteria and eukaryotes. The photoreactivity of the flavin adenine dinucleotide (FAD) cofactor in three BLUF domains from Rhodobacter sphaeroides, Synechocystis sp. PCC 6803 and Escherichia coli have been studied at low temperature using timeresolved electron paramagnetic resonance. Photoinduced flavin triplet states and radical-pair species have been detected on a microsecond time scale. Differences in the electronic structures of the FAD cofactors as reflected by altered zero-field splitting parameters of the triplet states could be correlated with changes in the amino-acid composition of the various BLUF domains’ cofactor binding pockets. For the generation of the light-induced, spin-correlated radical-pair species in the BLUF domain from Synechocystis sp. PCC 6803, a tyrosine residue near the flavin’s isoalloxazine moiety plays a critical role.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/70315
Item Type	Article
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > NMR (CAF)
Publisher	American Society of Photobiology
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