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Dynamic Nuclear Polarization Provides New Insights into Chromophore Structure in Phytochrome Photoreceptors.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2016 Dec 23; Vol. 55 (52), pp. 16017-16020. Date of Electronic Publication: 2016 Nov 23. - Publication Year :
- 2016
-
Abstract
- Phytochromes are red/far-red photochromic photoreceptors acting as master regulators of development in higher plants, thereby controlling transcription of about 20 % of their genes. Light-induced isomerization of the bilin chromophore leads to large rearrangements in protein structure, whereby the role of protonation dynamics and charge distribution is of particular interest. To help unravel the inherent mechanisms, we present two-dimensional dynamic nuclear polarization (DNP) enhanced solid-state magic-angle spinning (MAS) NMR spectra of the functional sensory module of the cyanobacterial phytochrome Cph1. To this end, the pyrrole ring nitrogen signals were assigned unequivocally, enabling us to locate the positive charge of the phycocyanobilin (PCB) chromophore. To help analyze proton exchange pathways, the proximity of PCB ring nitrogen atoms and functionally relevant H <subscript>2</subscript> O molecules was also determined. Our study demonstrates the value of DNP in biological solid-state MAS NMR spectroscopy.<br /> (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 55
- Issue :
- 52
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 27879035
- Full Text :
- https://doi.org/10.1002/anie.201608119