Related Experiment Video
Updated: Jul 8, 2026

Reconstitution of the Bacterial Glutamate Receptor Channel by Encapsulation of a Cell-Free Expression System
Published on: March 8, 2024
Folding and assembly of proteorhodopsin
Adriana L Klyszejko1, Sarika Shastri, Stefania A Mari
1Biotechnology Center, University of Technology Dresden, Germany.
Proteorhodopsins (PRs), light-driven proton pumps vital for ocean microbes, fold similarly to archaeal rhodopsins. These PRs primarily form hexameric and pentameric assemblies with radial arrangements, suggesting functional roles.
Area of Science:
- Microbiology
- Biophysics
- Structural Biology
Background:
- Proteorhodopsins (PRs) are recently discovered light-driven proton pumps crucial for energy metabolism in marine microorganisms.
- Unlike well-characterized archaeal and eukaryotic rhodopsins, the structural assembly and folding of native PRs remain largely unexplored.
Purpose of the Study:
- To investigate the oligomeric assembly and membrane folding of native proteorhodopsins.
- To compare the folding patterns of PRs with known archaeal rhodopsins.
Main Methods:
- Single-molecule microscopy
- Single-molecule spectroscopy
Main Results:
- Proteorhodopsins exhibit unfolding patterns consistent with bacteriorhodopsin and halorhodopsin, indicating similar folding mechanisms to archaeal rhodopsins.
- Native PRs predominantly assemble into hexameric oligomers, with a smaller proportion forming pentamers.
- Within these oligomeric structures, PR molecules adopt radial arrangements.
Conclusions:
- Proteorhodopsins share folding similarities with archaeal rhodopsins.
- The observed hexameric and pentameric radial assemblies of PRs may be functionally significant for their role as proton pumps in marine microbes.
More Related Videos
09:19Strategic Screening and Characterization of the Visual GPCR-mini-G Protein Signaling Complex for Successful Crystallization
Published on: March 16, 2020
10:31Residue-Specific Exchange of Proline by Proline Analogs in Fluorescent Proteins: How "Molecular Surgery" of the Backbone Affects Folding and Stability
Published on: February 3, 2022
Related Concept Videos
Protein Folding
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding
Protein Folding
Molecular Chaperones and Protein Folding
The...
Channel Rhodopsins
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Protein Complex Assembly
Many viruses self-assemble into a fully functional unit using the infected host cell to...