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On the collective nature of phytochrome photoactivation

Song, Chen, Psakis, Georgios, Lang, Christina, Mailliet, Jo, Zaanen, Jan, Gaertner, Wolfgang, Hughes, Jon and Matysik, Joerg (2011) On the collective nature of phytochrome photoactivation. Biochemistry, 50 (51). pp. 10987-10989. ISSN 0006-2960

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The red/far-red-sensing biological photoreceptor phytochrome is a paradigmatic two-state signaling system. The two thermally stable states are interconverted via a photoreaction of the covalently bound tetrapyrrole chromophore. Applying recently developed solid-state nuclear magnetic resonance, we study both the chromophore and its protein pocket in the Pr (red-absorbing) and Pfr (far-red-absorbing) states. The observations show that the phototransformation combines local chemical reactions with a mesoscopic transition of order. Both the chromophore and its binding pocket are quasi-liquid and disordered in Pr, yet quasi-solid and ordered in Pfr. Possible biochemical implications are discussed.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
Schools: School of Applied Sciences
Depositing User: Georgios Psakis
Date Deposited: 05 Sep 2013 11:22
Last Modified: 05 Sep 2013 11:22


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