Results 181 to 190 of about 14,467 (226)

Rhodopsin and phototransduction

Journal of Photochemistry and Photobiology B: Biology, 1999
Recent studies on rhodopsin structure and function are reviewed and the properties of vertebrate as well as invertebrate rhodopsin described. Open issues such as the 'red shift' of the absorbance spectra are emphasized in the light of the present model of the retinal-binding pocket. The processes that restore the rhodopsin content in photoreceptors are
I M Pepe
exaly   +3 more sources

Calcium and Phototransduction

2002
Visual phototransduction, the conversion of incoming light to an electrical signal, takes place in the outer segments of the rod and cone photoreceptor cells. Light reduces the concentration of cGMP, which, in darkness, keeps open cationic channels present in the plasma membrane of the outer segment. Ca2+ plays an important role in phototransduction by
Kei, Nakatani, Chunhe, Chen, King-Wai, Yau, Yiannis, Koutalos   +3 more
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Rhodopsin and Phototransduction

1993
Publisher Summary When light strikes a rod photoreceptor cell in the retina, rhodopsin molecules become photoexcited and a series of biochemical events rapidly follows. Photoexcited rhodopsin activates a G protein, transducin, which in turn activates a cyclic guanosine monophosphate (cGMP)-phosphodiesterase (PDE).
P A, Hargrave, J H, McDowell
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Phototransduction in transgenic mice

Current Opinion in Neurobiology, 1996
Transgenic mice provide a powerful tool for elucidating the molecular mechanisms of phototransduction. Mice expressing a phosphorylation-deficient rhodopsin and mice deficient in arrestin are being used to study shutoff of photoactivated rhodopsin. These in vivo mouse studies indicate that shutoff is partially mediated by rhodopsin phosphorylation ...
J, Lem, C L, Makino
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Phototransduction: crystal clear

Trends in Biochemical Sciences, 2003
Vertebrate visual phototransduction represents one of the best-characterized G-protein-coupled receptor-mediated signaling pathways. Structural analyses of rhodopsin, G protein, arrestin and several other phototransduction components have revealed common folds and motifs that are important for function.
Kevin D, Ridge, Najmoutin G, Abdulaev, Marcelo, Sousa, Krzysztof, Palczewski   +3 more
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G Proteins and Phototransduction

Annual Review of Physiology, 2002
▪ Abstract  Phototransduction is the process by which a photon of light captured by a molecule of visual pigment generates an electrical response in a photoreceptor cell. Vertebrate rod phototransduction is one of the best-studied G protein signaling pathways. In this pathway the photoreceptor-specific G protein, transducin, mediates between the visual
Vadim Y, Arshavsky, Trevor D, Lamb, Edward N, Pugh   +2 more
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PHYTOCHROME PHOTOTRANSDUCTION PATHWAYS

Annual Review of Genetics, 1994
INTRODUCTION ... .. .. .. .. .. .. .. .... 325 Phytochrome Control of Gene Expression Is Part of a Regulatory Network ... . . .. 326 THE GENETIC ANALYSIS OF PHOTOMORPHOGENESIS . . . . . . . . . . . . . . . . . . . . 328 Long-hypocotyl Mutants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A J, Millar, R B, McGrath, N H, Chua
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Phototransduction in invertebrates

Biological Cybernetics, 1987
A mathematical model predicting many facets of the PDA phenomenon is presented. The phototransduction process is divided into three interacting sublevels: pigment kinetics, transmitter dynamics and coupling of the signal to the membrane potential. The dynamics of each is studied, while showing their characteristics and limitations.
Öğmen, H., Gagné, S.
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Phototransduction in Vertebrate Rods

Annual Review of Neuroscience, 1985
Rods elaborate a special organelle for converting light into an electrical signal. Their outer segment contains a long stack of flattened sacs, or discs, covered by the plasmalemma. Embedded in the disc membrane are rhodopsin mole­ cules; within the plasmalemma are channels that allow the entry of Na ions during darkness.
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The molecular genetics of invertebrate phototransduction

Trends in Neurosciences, 1991
Phototransduction, the primary event in the processing of visual stimuli, is the conversion of light energy into a change in the ionic permeabilities of the photoreceptor cell membrane. In both vertebrates and invertebrates, this process is carried out through a specialized form of a G-protein-coupled receptor cascade.
R, Ranganathan, W A, Harris, C S, Zuker
openaire   +2 more sources