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Related Concept Videos

Cotranslational Protein Translocation01:20

Cotranslational Protein Translocation

Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
Channel Rhodopsins01:11

Channel Rhodopsins

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G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Protein Transport to the Thylakoids01:22

Protein Transport to the Thylakoids

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Activation and Inactivation of G Proteins

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Related Experiment Video

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Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina
09:05

Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina

Published on: May 6, 2015

Light threshold-controlled cone alpha-transducin translocation.

Junping Chen1, Mingyuan Wu, Steven A Sezate

  • 1Oklahoma Center for Neuroscience, The University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.

Investigative Ophthalmology & Visual Science
|June 27, 2007
PubMed
Summary

Cone alpha-transducin (cTalpha) can translocate in rod cells under light conditions, challenging previous assumptions. High-intensity light triggers cTalpha redistribution in cones, suggesting a protective mechanism against bright light.

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Area of Science:

  • Photoreceptor biology
  • Visual transduction mechanisms
  • Retinal adaptation

Background:

  • Light-induced translocation of rod alpha-transducin (rTalpha) is a known mechanism for light adaptation in rod cells.
  • Cone alpha-transducin (cTalpha) has not been previously shown to undergo light-dependent redistribution.

Purpose of the Study:

  • To investigate the potential reasons for the restricted localization of cTalpha to cone outer segments.
  • To examine the light-dependent translocation of cTalpha in rod and cone photoreceptor cells.

Main Methods:

  • Established a transient transgenic strategy in rats to express cTalpha in rod photoreceptor cells.
  • Utilized subretinal injection and electroporation of vector DNA encoding cTalpha and GFP.
  • Determined cTalpha localization using immunofluorescent techniques under varying light conditions.

Main Results:

  • Successfully achieved transient transfection of retinal cells with exogenous cTalpha.
  • Exogenously expressed cTalpha in rods localized similarly to endogenous rTalpha under light and dark conditions.
  • Demonstrated translocation of endogenous cTalpha in cone photoreceptor cells under high-intensity light (7000 lux).

Conclusions:

  • Successfully developed an in vivo transient retinal transfection model.
  • Showed that cTalpha is capable of translocation in rods, indicating no inherent restriction.
  • Identified a light threshold regulating cTalpha redistribution, potentially as a photoprotective response.