Sensory Perception and Transduction in Aneural Organisms

Organisms, Transduction in Aneural; Colombetti, Giuliano; Lenci, Francesco; Song, Pill‐Soon

doi:10.1007/978-1-4613-2497-3

1985

DOI: 10.1007/978-1-4613-2497-3

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Sensory Perception and Transduction in Aneural Organisms

Transduction in Aneural Organisms¹,

Giuliano Colombetti²,

Francesco Lenci³

et al.

Abstract: A series presenting the results of activities sponsored by the NATO Science Committee, which aims at the dissemination of advanced scientific and technological knowledge, with a view to strengthening links between scientific communities.

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Cited by 4 publications

References 230 publications

(362 reference statements)

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Analysis of photoreceptor proteins of microorganisms by gradient gel electrophoresis and other biochemical separation methods

Häder

Lebert

1994

Electrophoresis

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Photoreceptor proteins for photoorientation in microorganisms are usually membrane bound and can be isolated by standard biochemical methods. Three examples are shown: the flagellates Euglena gracilis, Peridinum gatunense and the slime mold Dictyostelium discoideum. The photoreceptor of Euglena is attached to the basis of the flagellum and is composed of at least four chromoproteins which can be separated by gradient sodium dodecyl sulfate - polyacrylamide gel electrophoresis (SDS-PAGE) fast protein liquid chromatography (FPLC) and isoelectric focusing (IEF); it contains pterins and a flavin as chromophoric groups. The photoreceptor of Peridinium absorbs in the red wavelength band. Though not yet identified in detail, multiple receptors are probably involved, as indicated by fluorescence spectroscopy. Dictyostelium shows positive and negative phototaxis in its amoebal form and exclusively positive phototaxis in its pseudoplasmodial form. It is still open to discussion whether the two stages use separate photoreceptors. From amoebae two photoreceptor pigments have been isolated, showing an absorption which resembles the action spectrum, one membrane bound with a molecular mass of 45 kDa and one cytoplasmic fraction with a molecular mass of 27 kDa.

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Analysis of photoreceptor proteins of microorganisms by gradient gel electrophoresis and other biochemical separation methods

Häder

Lebert

1994

Electrophoresis

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Evidence for type II phytochrome-induced rapid signalling leading to cab :: luciferase gene expression in tobacco cotyledons

Furuya

2001

Planta

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We studied the activation of cab gene expression by phytochrome-induced intercellular signalling and report insights into the mechanism of induction and outspread of a plant internal signal. By micro-beam irradiation techniques and use of a photon-imaging charge-coupled device (CCD) camera system we monitored cab::luciferase reporter gene expression in cotyledons of transgenic tobacco (Nicotiana tabacum L. cv. Xanthi) plants. We found that (i) the photoreceptor triggering intercellular signalling and reporter-gene expression is type II but not type I phytochrome, (ii) phytochrome in its far-red-absorbing (Pfr) form is necessary for the induction but not for the outspread of the signalling, (iii) red/far-red reversibility is restricted to the red-irradiated cells, and (iv) the phytochrome-induced signal spreads rapidly throughout the cotyledon and reaches its target cells within minutes.

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Do phytochromes interact with diverse partners?

Furuya

Kim

2000

Trends in Plant Science

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Sensory Perception and Transduction in Aneural Organisms

Abstract: A series presenting the results of activities sponsored by the NATO Science Committee, which aims at the dissemination of advanced scientific and technological knowledge, with a view to strengthening links between scientific communities.

Cited by 4 publications

References 230 publications

Analysis of photoreceptor proteins of microorganisms by gradient gel electrophoresis and other biochemical separation methods

Analysis of photoreceptor proteins of microorganisms by gradient gel electrophoresis and other biochemical separation methods

Evidence for type II phytochrome-induced rapid signalling leading to cab :: luciferase gene expression in tobacco cotyledons

Do phytochromes interact with diverse partners?

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