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Related Concept Videos

Channel Rhodopsins01:11

Channel Rhodopsins

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.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
The Retina01:32

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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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G-Protein Gated Ion Channels

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.
Sensory organs,...

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Related Experiment Video

Updated: Jun 19, 2026

A Rhodopsin Transport Assay by High-Content Imaging Analysis
12:11

A Rhodopsin Transport Assay by High-Content Imaging Analysis

Published on: January 16, 2019

ON RHODOPSIN IN SOLUTION.

G Wald1

  • 1Biological Laboratories of Harvard University, Cambridge.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Rhodopsin bleaching involves light and thermal processes, with pH significantly affecting dark reactions and product spectra. Its spectral properties align with human rod vision sensitivity.

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Area of Science:

  • Biochemistry
  • Vision Science
  • Photochemistry

Background:

  • Rhodopsin is the primary visual pigment in rod cells.
  • Understanding rhodopsin's properties is crucial for vision research.
  • Its bleaching process is fundamental to phototransduction.

Purpose of the Study:

  • To investigate the properties of rhodopsin in solution.
  • To characterize the kinetics and pH-dependence of rhodopsin bleaching.
  • To compare rhodopsin's spectral properties with human rod vision.

Main Methods:

  • Spectrophotometric analysis of rhodopsin from various species.
  • Investigation of bleaching kinetics under different pH conditions.
  • Examination of spectral changes during photic and thermal degradation.

Main Results:

  • Rhodopsin bleaching involves both photic and multiple thermal reactions.
  • Thermal reactions contribute significantly to spectral changes.
  • Product spectra are highly pH-labile, while pure rhodopsin spectra are stable.
  • Rhodopsin's spectrum closely matches human rod vision spectral sensitivity.

Conclusions:

  • Rhodopsin bleaching is a complex process influenced by pH.
  • The spectral characteristics of rhodopsin are conserved and relevant to human vision.
  • Further study of rhodopsin kinetics is important for understanding the visual cycle.