Giant Virus Yields a Potassium Channel Gene Linked to Complex Protein Origins
Researchers at TU Darmstadt and H-BRS identify a functional tandem ion channel inside a marine algal virus.
By Letizia Giugliano
2 min readHuman-Edited, AI-Assisted
A DNA virus that infects marine algae carries a working gene for a tandem potassium channel, according to a study published in the Proceedings of the National Academy of Sciences. The finding points to giant viruses as active players in the structural evolution of cellular proteins.
A missing evolutionary link in cell membrane control
Tandem potassium channels govern critical biological roles in human cells, moving potassium ions across the cell membrane to stabilize electrical voltage and control the firing of nerve cells. Unlike simpler potassium channels found across bacteria, tandem variants link two pore-forming subunits directly to one another. That unique structure has long puzzled biologists because ancestral forms had never turned up in bacterial genomes.
Now, research reported by Phys.org reveals that an algal virus contains a gene encoding a functional tandem channel known as Kpov. The work was conducted by an international team that includes the Department of Biology at TU Darmstadt and the Department of Natural Sciences at the Bonn-Rhein-Sieg University of Applied Sciences (H-BRS).
“Our experiments show that this gene encodes a protein with the functional properties of a potassium channel.”
— Dr. Oliver Rauh, H-BRS
Viral origin rather than stolen cellular cargo
Many viral genes originate when a virus absorbs fragments of genetic code from its host. The researchers tested the evolutionary relationships of the new channel and observed the opposite pattern: the gene shows signs of direct viral origin rather than being pirated from the host alga.
Laboratory tests confirmed the practical activity of the molecule. Dr. Oliver Rauh, a researcher in the German Research Foundation network CytoTransport at H-BRS, noted that laboratory experiments show the gene encodes a protein with the functional properties of a potassium channel. Gerhard Thiel, a biology professor at TU Darmstadt, stated that the evidence supports a perspective in which giant mimiviruses played a central role in the evolution of proteins in higher organisms.
Molecular tools and biotechnology applications
The discovery reinforces that large DNA viruses serve as natural reservoirs of functional ion-transport machinery. In the same algal virus, scientists previously identified a light-sensitive ion channel that became a cornerstone tool in optogenetics, a field recognized with a Nobel Prize.
While no patent application or commercial filing was disclosed in the study, discovering naturally optimized ion channels provides a foundation for biological innovation. Such channel genes expand the molecular catalog available for synthetic biology and cellular research, showing that structural invention in nature was not confined to cellular life.
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