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ShropshireJr., W.; Mohr, Heather

doi:10.1007/978-3-642-68918-5_1

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“…Phytochrome, the plant photoreceptor for light-mediated differentiation and development, carries a single 2,3-dihydrobilin chromophore covalently bound to a protein of molecular mass 124 kDa (Shropshire and Mohr, 1983;Lagarias, 1985;Kendrick and Kronenberg, 1986;Furuya, 1987) (Fig. 1 a).…”

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Infrared spectroscopy of phytochrome and model pigments

Siebert

Grimm

Rüdiger

et al. 1990

European Journal of Biochemistry

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Fourier-transform infrared difference spectra between the red-absorbing and far-red-absorbing forms of oat phytochrome have been measured in H 2 0 and 2H20. The difference spectra are compared with infrared spectra of model compounds, i.e. the (52,102,152)-and (52,102,15E)-isomers of 2,3,7,8,12,13,17,18-octaethyl-bilindion (Et8-bilindion), 2,3-dihydro-2,3,7,8,12,13,17,18-octaethyl-bilindion (H2Et8-bilindion), and protonated H,Et8-bilindion in various solvents. The spectra of the model compounds show that only for the protonated forms can clear differences between the two isomers be detected. Since considerable differences are present between the spectra of Et8-bilindion and H2Et8-bilindion, it is concluded that only the latter compound can serve as a model system of phytochrome. The 2 H z 0 effect on the difference spectrum of phytochrome supports the view that the chromophore in red-absorbing phytochrome is protonated and suggests, in addition, that it is also protonated in far-red-absorbing phytochrome. The spectra show that protonated carboxyl groups are influenced. The small amplitudes in the difference spectra exclude major changes of protein secondary structure.

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Infrared spectroscopy of phytochrome and model pigments

Siebert

Grimm

Rüdiger

et al. 1990

European Journal of Biochemistry

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“…By 1983, the term seemed somewhat accepted in the plant community; the term cryptochrome appeared on 71 pages in the Encyclopedia of Plant Physiology volume on photomorphogenesis. 9 We continued to use the term with self-assurance with the advent of a wonderful new student, Benjamin Horwitz, working in my laboratory on Trichoderma photoperception. Among his many advances was showing electrical current changes in the zone of the mycelia that was photoinduced 10 ; isolating a cryptochrome photoperception mutant 11 ; showing that the mutant cryptochrome was missing one of its three peaks 12 ; and that a single strong nanosecond laser flash of blue light would photoinduce fungal sporulation 13 maintaining dose/time reciprocity with much lower fluences over longer periods.…”

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The naming of the blue UV photoreceptor “cryptochrome”: From despised pun to ubiquitously found chromophore(s) controlling multiple functions

Gressel

2023

Photochem & Photobiology

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Advice to the Reader

Cited by 2 publications

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Infrared spectroscopy of phytochrome and model pigments

Infrared spectroscopy of phytochrome and model pigments

The naming of the blue UV photoreceptor “cryptochrome”: From despised pun to ubiquitously found chromophore(s) controlling multiple functions

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