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Related Concept Videos

Channel Rhodopsins01:11

Channel Rhodopsins

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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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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,...
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The Retina01:32

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G-Protein Gated Ion Channels01:21

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Related Experiment Video

Updated: May 5, 2026

A Rhodopsin Transport Assay by High-Content Imaging Analysis
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Channelrhodopsins: a bioinformatics perspective.

Coral Del Val1, José Royuela-Flor2, Stefan Milenkovic2

  • 1Department of Computer Science and Artificial Intelligence, University of Granada, 18071 Granada, Spain.

Biochimica Et Biophysica Acta
|November 21, 2013
PubMed
Summary

Bioinformatics analysis of channelrhodopsins reveals conserved motifs and structural insights. These findings on protein dynamics and ion specificity could aid in developing channelrhodopsin variants for neurobiology applications.

Keywords:
BioinformaticsChannelrhodopsinMembrane proteinProtein structure and dynamics

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Area of Science:

  • Biophysics
  • Structural Biology
  • Neuroscience

Background:

  • Channelrhodopsins are light-gated ion channels crucial for optogenetics.
  • Understanding their structure-function relationship is key for targeted applications.

Purpose of the Study:

  • To elucidate the structural basis of channelrhodopsin dynamics and ion selectivity.
  • To identify conserved motifs for guiding protein engineering.

Main Methods:

  • Bioinformatic sequence alignment and conservation analysis.
  • Homology modeling to generate 3D structural models.
  • Analysis of conserved amino acid residues and hydrogen bonding patterns.

Main Results:

  • Identified conserved motifs within channelrhodopsin sequences.
  • Revealed the presence of Cys, Ser, and Thr groups in helices C and D.
  • Proposed that these groups form hydrogen-bonding clusters influencing protein dynamics and water interactions.

Conclusions:

  • Conserved structural features in channelrhodopsins are critical for their function.
  • Insights gained can inform the design of novel channelrhodopsin mutants for neurobiology.
  • Further research into these structural dynamics may unlock new optogenetic tools.