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Related Experiment Video

Updated: Jun 29, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

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Rhodopsin: structural basis of molecular physiology.

S T Menon¹, M Han, T P Sakmar

¹Howard Hughes Medical Institute, Laboratory of Molecular Biology and Biochemistry, The Rockefeller University, New York, New York 10021, USA.

Physiological Reviews

|October 3, 2001

Summary

The crystal structure of rhodopsin reveals unique protein-chromophore interactions and structural features. This provides insights into the visual system

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Area of Science:

Structural biology
Biochemistry
Neuroscience

Background:

The structure of rod cell visual pigment rhodopsin was recently solved at 2.8-A resolution.
A decade of structure-function studies on rhodopsin can now be critically evaluated.
The structural basis for unique vertebrate visual system properties can be explored.

Purpose of the Study:

To provide a critical evaluation of rhodopsin structure-function studies.
To explain the structural basis for unique physiological properties of the vertebrate visual system.
To support the helix movement model of receptor activation for G protein-coupled receptors (GPCRs).

Main Methods:

X-ray crystallography at 2.8-A resolution.
Analysis of chromophore-protein interactions.
Evaluation of mutagenesis and spectroscopic studies.

Main Results:

Rhodopsin's ligand-binding pocket is compact with unpredicted chromophore-protein interactions.
Transmembrane helices exhibit interruptions and kinks, stabilized by interhelical interactions.
Structural elements support the helix movement model for GPCR activation.

Conclusions:

The rhodopsin structure provides a basis for understanding visual system physiology.
The cytoplasmic domain structure suggests a one-to-one complex with transducin.
Future studies will elucidate GPCR-mediated signal transduction mechanisms.