کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2036135 1072246 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photoconversion and Nuclear Trafficking Cycles Determine Phytochrome A's Response Profile to Far-Red Light
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی، ژنتیک و زیست شناسی مولکولی (عمومی)
پیش نمایش صفحه اول مقاله
Photoconversion and Nuclear Trafficking Cycles Determine Phytochrome A's Response Profile to Far-Red Light
چکیده انگلیسی

SummaryPhytochrome 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 phyA's 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.

Graphical AbstractFigure optionsDownload high-quality image (337 K)Download as PowerPoint slideHighlights
► Constitutively active phyA does not accumulate in the nucleus
► Cycling between the active and inactive state is essential for phyA signaling
► PhyA degradation is important for shifting responsiveness toward FR
► Response to FR requires coupling between two antagonistic photoconversion cycles

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: - Volume 146, Issue 5, 2 September 2011, Pages 813–825
نویسندگان
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