scholarly journals A photoproduct of DXCF cyanobacteriochromes without reversible Cys ligation is destabilized by rotating ring twist of the chromophore

2020 ◽  
Vol 19 (10) ◽  
pp. 1289-1299
Author(s):  
Keiji Fushimi ◽  
Takumi Matsunaga ◽  
Rei Narikawa
Keyword(s):  
Dark Reversion

Twisted DXCF CBCRs showed dark reversion but relaxed ones did not show detectable dark reversion. The reaction was observed not for the DXCF CBCRs having reversible ligation activity, but for the DXCF CBCRs lacking reversible ligation activity.

scholarly journals Phosphorylation of Phytochrome B Inhibits Light-Induced Signaling via Accelerated Dark Reversion in Arabidopsis

2013 ◽  
Vol 25 (2) ◽  
pp. 535-544 ◽  
Author(s):  
Mátyás Medzihradszky ◽  
János Bindics ◽  
Éva Ádám ◽  
András Viczián ◽  
Éva Klement ◽  
...  
Keyword(s):  
Phytochrome B ◽  
Dark Reversion

scholarly journals Photophysical diversity of two novel cyanobacteriochromes with phycocyanobilin chromophores: photochemistry and dark reversion kinetics

FEBS Journal ◽  
2011 ◽  
Vol 279 (1) ◽  
pp. 40-54 ◽  
Author(s):  
Yu Chen ◽  
Juan Zhang ◽  
Juan Luo ◽  
Jun-Ming Tu ◽  
Xiao-Li Zeng ◽  
...  
Keyword(s):  
Dark Reversion

Inverse dark reversion of phytochrome: An explanation

Planta ◽  
1974 ◽  
Vol 120 (3) ◽  
pp. 265-272 ◽  
Author(s):  
R. E. Kendrick ◽  
C. J. P. Spruit
Keyword(s):  
Dark Reversion

Significance of Dark Reversion of Phytochrome in Flowering of Short-Day Plants

Science ◽  
1962 ◽  
Vol 136 (3513) ◽  
pp. 324-324 ◽  
Author(s):  
H. A. Borthwick ◽  
H. M. Cathey
Keyword(s):  
Short Day ◽  
Dark Reversion

THE DEPENDENCE OF GERMINATION ON PHOTOPERIOD, LIGHT QUALITY, AND TEMPERATURE, IN CHENOPODIUM SPP.

1963 ◽  
Vol 41 (8) ◽  
pp. 1211-1233 ◽  
Author(s):  
Bruce G. Cumming
Keyword(s):  
Indirect Evidence ◽  
Spectral Energy ◽  
Floral Initiation ◽  
Optimum Conditions ◽  
Adaptive Value ◽  
Light Requirements ◽  
Dark Reversion ◽  
Green Vegetation ◽  
Energy Ratios ◽  
Optimum Response

In Chenopodium botrys, darkness was suboptimal for germination at all temperatures. At low to intermediate temperatures (10 to 20 °C) short photoperiods were optimal while longer ones were supraoptimal. At high temperatures (25° to 35 °C) extremely long photoperiods were optimal and all shorter ones were suboptimal. There was less germination in light of low than high red to far-red (R/FR) spectral energy ratios, particularly in long photoperiods. Decreasing the R/FR ratio for the terminal 30 minutes of daily photoperiods restricted germination considerably in short but not in extreme long photoperiods (18 and 20 hours). It is postulated that sub- and supra-optimal amounts of phytochrome-Pfr were produced, respectively, in the sub- and supra-optimal photoperiods, which resulted in less germination; further, that the temperature-induced responses may be due to a lower optimum requirement for Pfr at low than at higher temperatures and, or, a faster rate of dark reversion of Pfr to Pr may occur with increase in temperature. This provides a correlative scheme similar to that postulated for floral initiation of C. rubrum, whether optimum response is in short or long photoperiods.Ambiphotoperiodism, resembling the response previously shown in C. rubrum floral initiation, occurred in C. botrys germination. This may be indicative of endogenously controlled rhythms interacting with the phytochrome system.Several Chenopodium spp. germinated more in darkness than in long photoperiods of low R/FR ratio. Indirect evidence suggests that there may be formation of phytochrome-Pfr in darkness, sufficient to promote germination.On the basis of laboratory tests with Chenopodium spp. two ecologically significant phenomena are postulated. Firstly, there may be restriction of germination in areas shaded by green plants. There was more germination in light with R/FR ratios similar to that of sunlight (1.3) than sunlight transmitted through green vegetation (0.70 to 0.12). Secondly, stages of incomplete germination of seeds, in which there is rupture of the testa and loss of previous light requirements, may be of adaptive value, particularly under arid conditions. Seeds with incomplete germination remained viable for prolonged periods, whether kept moist or dried, but germinated very rapidly when transferred to optimum conditions.

scholarly journals Acceleration of Dark Reversion of Phytochrome in Vitro by Calcium and Magnesium

1975 ◽  
Vol 56 (1) ◽  
pp. 157-159 ◽  
Author(s):  
Moshé Negbi ◽  
David W. Hopkins ◽  
Winslow R. Briggs
Keyword(s):  
Dark Reversion ◽  
Calcium And Magnesium

scholarly journals Enhancing the Inhomogeneonus Photodynamics of Canonical Bacteriophytochrome

2021 ◽  
Author(s):  
Jakub Rydzewski ◽  
Katarzyna Walczewska-Szewc ◽  
Sylwia Czach ◽  
Marco Caricato ◽  
Sijin Ren ◽  
...  
Keyword(s):  
Energy Barrier ◽  
Deinococcus Radiodurans ◽  
Metastable States ◽  
Signal Transduction Pathways ◽  
Nanometer Scale ◽  
Thermal Transition ◽  
Enhanced Sampling ◽  
Temperature Dependent ◽  
Dark Reversion ◽  
First Time

The ability of phytochromes to act as photoswitches in plants and microorganisms depends on interactions between a bilin-like chromophore and a protein. The interconversion occurs between the spectrally distinct red (Pr) and far-red (Pfr) conformers. This conformational change is triggered by the photoisomerization of the chromophore D-ring pyrrole. In this study, as a representative example of a phytochrome-bilin system, we take biliverdin IXα (BV) bound to bacteriophytochrome (BphP) from Deinococcus radiodurans. In the absence of light, we use an enhanced sampling molecular dynamics (MD) method to overcome the photoisomerization energy barrier. We find that the calculated free energy (FE) barriers between essential metastable states agree with spectroscopic results. We show that the enhanced dynamics of the BV chromophore in BphP triggers nanometer-scale conformational movements that propagate by two experimentally determined signal transduction pathways. Most importantly, we describe how the metastable states enable a thermal transition known as the dark reversion between Pfr and Pr, through a previously unknown intermediate state of Pfr. Here, for the first time, the heterogeneity of temperature-dependent Pfr states is presented at the atomistic level. This work paves a way toward understanding the complete mechanism of the photoisomerization of a bilin-like chromophore in phytochromes.

A detailed analysis of phytochrome decay and dark reversion in mustard cotyledons

Planta ◽  
1971 ◽  
Vol 100 (4) ◽  
pp. 331-336 ◽  
Author(s):  
D. Marm� ◽  
B. Marchal ◽  
E. Sch�fer
Keyword(s):  
Detailed Analysis ◽  
Dark Reversion
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