Phytochrome signalling is mediated through nucleoside diphosphate kinase 2

Giltsu Choi (), Hankuil Yi, Jaeho Lee, Yong-Kook Kwon, Moon Soo Soh, Byongchul Shin, Zigmund Luka, Tae-Ryong Hahn and Pill-Soon Song
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Giltsu Choi: Kumho Life and Environmental Science Laboratory
Hankuil Yi: Kumho Life and Environmental Science Laboratory
Jaeho Lee: Kyung Hee University
Yong-Kook Kwon: University of Nebraska
Moon Soo Soh: Kumho Life and Environmental Science Laboratory
Byongchul Shin: Kumho Life and Environmental Science Laboratory
Zigmund Luka: Kumho Life and Environmental Science Laboratory
Tae-Ryong Hahn: Kyung Hee University
Pill-Soon Song: Kumho Life and Environmental Science Laboratory

Nature, 1999, vol. 401, issue 6753, 610-613

Abstract: Abstract Because plants are sessile, they have developed intricate strategies to adapt to changing environmental variables, including light. Their growth and development, from germination to flowering, is critically influenced by light, particularly at red (660 nm) and far-red (730 nm) wavelengths1,2. Higher plants perceive red and far-red light by means of specific light sensors called phytochromes(A–E)3. However, very little is known about how light signals are transduced to elicit responses in plants. Here we report that nucleoside diphosphate kinase 2 (NDPK2) is an upstream component in the phytochrome signalling pathway in the plant Arabidopsis thaliana. In animal and human cells, NDPK acts as a tumour suppressor4. We show that recombinant NDPK2 in Arabidopsis preferentially binds to the red-light-activated form of phytochrome in vitro and that this interaction increases the activity of recombinant NDPK2. Furthermore, a mutant lacking NDPK2 showed a partial defect in responses to both red and far-red light, including cotyledon opening and greening. These results indicate that NDPK2 is a positive signalling component of the phytochrome-mediated light-signal-transduction pathway in Arabidopsis.

Date: 1999
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DOI: 10.1038/44176

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