Light signal transduction pathway from flavin chromophore to the J alpha helix of Arabidopsis phototropin1.
Light signal transduction pathway from flavin chromophore to the J alpha helix of Arabidopsis phototropin1.
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从黄素发色团到拟南芥趋光素1 J α 螺旋的光信号转导途径。
DOI:
10.1016/j.bpj.2008.12.3924
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发表时间:
2009
影响因子:
3.4
通讯作者:
H. Kandori
中科院分区:
文献类型:
--
作者:
Atsushi Yamamoto;T. Iwata;Yoshiaki Sato;D. Matsuoka;S. Tokutomi;H. Kandori
In the plant blue-light sensor phototropin, illumination of the chromophoric LOV domains causes activation of the serine/threonine kinase domain. Flavin mononucleotide (FMN) is a chromophore molecule in the two LOV domains (LOV1 and LOV2), but only LOV2 is responsible for kinase activation. Previous studies reported an important role of an additional helix connected to the C-terminal of LOV2 (Jαhelix) for the function of phototropin; however, it remains unclear how the Jαhelix affects light-induced structural changes in LOV2. In this study we compared light-induced protein structural changes of the LOV2 domain ofArabidopsisphot1 in the absence (LOV2-core) and presence (LOV2-Jα) of the Jαhelix by Fourier-transform infrared spectroscopy. Prominent peaks were observed only in the amide-I region (1650 (−)/1625 (+) cm−1) of LOV2-Jαat physiological temperatures (≥260 K), corresponding to structural perturbation of theα-helix. The peaks were diminished by point mutation of functionally important amino acids such as Phe-556 between FMN and theβ-sheet, Gln-575 being hydrogen-bonded with FMN, and Ile-608 on the Jαhelix. We thus conclude that a light signal is relayed from FMN through these amino acids and eventually changes the interaction between LOV2-core and the Jαhelix inArabidopsisphot1.
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影响因子:
3.1
作者:
Bednarz, T;Losi, A;Heberle, J
通讯作者:
Heberle, J
影响因子:
2.9
作者:
Halavaty, Andrei S.;Moffat, Keith
通讯作者:
Moffat, Keith
影响因子:
2.9
作者:
Crosson, S;Rajagopal, S;Moffat, K
通讯作者:
Moffat, K
影响因子:
2.9
作者:
Kennis, JTM;Crosson, S;van Grondelle, R
通讯作者:
van Grondelle, R