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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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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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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Updated: Jan 18, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Rhodopsin: The hydrogen atom of membrane biophysics.

Zachary T Bachler1, Evelyn W Cheng1, Maya N Arruda1

  • 1Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA.

Biophysical Journal
|January 16, 2026
PubMed
Summary
This summary is machine-generated.

Cells maintain membrane properties like curvature stress through lipid composition regulation to ensure proper protein function. Rhodopsin serves as a key model system for studying these adaptations.

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Area of Science:

  • Membrane biophysics
  • Lipidomics
  • Protein-lipid interactions

Background:

  • Cellular membranes maintain specific lipidomes via homeostatic regulation despite environmental changes.
  • Lipidomics advancements show altered membrane composition significantly impacts physiology and protein function.
  • Understanding which membrane features are critical for protein function is a key question in membrane biology.

Purpose of the Study:

  • To investigate how membrane properties like asymmetry, packing, and elasticity are modulated by lipid composition.
  • To identify the critical membrane feature cells maintain for proper protein function.
  • To explore the role of curvature stress in regulating protein activity across different lipid compositions.

Main Methods:

  • Focus on key membrane properties: asymmetry, packing, and elasticity.
  • Analysis of lipid composition's modulation of protein function.
  • Utilizing rhodopsin as a model system due to its abundance and spectroscopic properties.

Main Results:

  • Curvature stress is identified as a likely target of homeostatic regulation.
  • Changes in lipid composition systematically alter membrane physical properties, affecting protein activity.
  • Rhodopsin enables precise measurements of conformational equilibria, linking lipid composition to membrane curvature adaptation.

Conclusions:

  • Curvature stress, influenced by lipid packing and leaflet asymmetry, is crucial for adapting protein function to membrane composition.
  • Rhodopsin is an indispensable model system in membrane biophysics for dissecting lipid-protein interactions and membrane adaptation.
  • Maintaining specific membrane properties, particularly related to curvature, is essential for cellular function.