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Photoconversion and Nuclear Trafficking Cycles Determine Phytochrome As Response Profile to Far-Red Light
University of Freiburg.
University of Freiburg.
University of Tubingen.
University of Freiburg.
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2011 (English)In: Cell, ISSN 0092-8674, E-ISSN 1097-4172, Vol. 146, no 5, 813-825 p.Article in journal (Refereed) Published
Abstract [en]

Phytochrome A (phyA) is the only photoreceptor in plants, initiating responses in far-red light and, as such, essential for survival in canopy shade. Although the absorption and the ratio of active versus total phyA are maximal in red light, far-red light is the most efficient trigger of phyA-dependent responses. Using a joint experimental-theoretical approach, we unravel the mechanism underlying this shift of the phyA action peak from red to far-red light and show that it relies on specific molecular interactions rather than on intrinsic changes to phyAs spectral properties. According to our model, the dissociation rate of the phyA-FHY1/FHL nuclear import complex is a principle determinant of the phyA action peak. The findings suggest how higher plants acquired the ability to sense far-red light from an ancestral photoreceptor tuned to respond to red light.

Place, publisher, year, edition, pages
Elsevier (Cell Press) , 2011. Vol. 146, no 5, 813-825 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-71103DOI: 10.1016/j.cell.2011.07.023ISI: 000294477500020OAI: diva2:444804
Available from: 2011-09-30 Created: 2011-09-30 Last updated: 2012-03-25

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Timmer, Jens
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