Kottke, Tilman and Heberle, Joachim and Hehn, Dominic and Dick, Bernhard and Hegemann, Peter (2003) Phot-LOV1: Photocycle of a blue-light receptor domain from the green alga Chlamydomonas reinhardtii. BIOPHYSICAL JOURNAL, 84 (2). pp. 1192-1201. ISSN 0006-3495
Full text not available from this repository.Abstract
The "Phot" protein family comprises blue-light photoreceptors that consist of two flavin mononucleotide (FMN)binding LOV (light, oxygen, and voltage) domains and a serine/threonine kinase domain. We have investigated the LOV1 domain of Phot1 from Chlamydomonas reinhardtii by time-resolved absorption spectroscopy. Photoexcitation of the dark form, LOV1-447, causes transient bleaching and formation of two spectrally similar red-shifted intermediates that are both assigned to triplet states of the FMN. The triplet states decay with time constants of 800 ns and 4 mus with an efficiency of >90% into a blue-shifted intermediate, LOV1-390, that is attributed to a thiol adduct of cysteine 57 to FMN C(4a). LOV1-390 reverts to the dark form in hundreds of seconds, the time constant being dependent on pH and salt concentration. In the mutant C57S, where the thiol adduct cannot be formed, the triplet state displays an oxygen-dependent decay directly to the dark form. We present here a spectroscopic characterization of an algal sensory photoreceptor in general and of a LOV1 domain photocycle in particular. The results are discussed with respect to the behavior of the homologous LOV2 domain from oat.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PLANT PHOTORECEPTOR DOMAIN; FLAVIN MONONUCLEOTIDE; PHOTOCHEMICAL PROPERTIES; PHOTOTROPIN FAMILY; ARABIDOPSIS NPH1; BINDING DOMAINS; PHOT1; NPL1; FMN; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Lehrstuhl für Biochemie I Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Bernhard Dick |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Aug 2021 12:19 |
| Last Modified: | 24 Aug 2021 12:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/39293 |
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