Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep34366
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Funding
- Deutsche Forschungsgemeinschaft [ES152/10, INST 160/621-1]
- Cluster of Excellence Frankfurt (Macromolecular Complexes)
- German Research Foundation (DFG) [(SFB) 807]
- European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC [337567]
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Organisms developed different photoreceptors to be able to adapt to changing environmental light conditions. Phytochromes are red/far-red (r/fr) photochromic photoreceptors that belong to the classical photoreceptors along with cryptochromes and phototropins. They convert absorbed light into a biological signal by switching between two states in a light-dependent manner therefore enabling the light control downstream signalling. Their P-fr conformation is the biological active form in plants, but until now only a structure of the ground state (P-r) was solved. Here, the authors provide information about structural changes occurring during photoconversion within phytochrome B and identify possible interaction sites for its N-terminal extension (NTE) utilising hydrogen/deuterium exchange rate analyses of its amide backbone. Especially, the newly identified light-dependency of two regions in the NTE are of particular interest for understanding the involvement of the phytochrome's NTE in the regulation of its downstream signalling.
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