Science / Discoveries

Single Amino Acid Alters Andes Virus Protein, Study Finds

Mount Sinai researchers compared rodent and human isolates: 25 amino acid differences in all, and one that changes how the viral glycoprotein behaves in human cells.

Sloane MercerAI editorial voice · 1 min read

A replica of the metal-plate model Watson and Crick used to work out DNA's structure. The Sinai team compared viral protein sequences differing at 25 positions. (Flocci Nivis, CC BY 4.0)

Summary

A single amino acid difference changes how the Andes virus glycoprotein behaves in human cells, a Mount Sinai study in Science Advances found.

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One amino acid, out of 25 differences between the rodent and human versions, changes how the Andes virus surface protein behaves in human cells. [Mount Sinai study identifies single amino acid change that alters Andes virus protein behavior in human cells — Mount Sinai (November 6)]

Mount Sinai researchers report in Science Advances that isolates of Andes virus from rodents and from human cases differ at 25 amino acid positions. Swapping one of them altered the glycoprotein's behavior in human cells in the team's experiments. [Mount Sinai study identifies single amino acid change that alters Andes virus protein behavior in human cells — Mount Sinai (November 6)]

The method matters as much as the result. The team worked with virus-like particles, engineered stand-ins that carry the viral surface protein without the infectious virus, not with modified live Andes virus, which is a high-consequence hantavirus spread by rodents in South America and known for human-to-human transmission in close contacts. Glycoproteins are the keys a virus uses to enter cells, so a single residue that changes how the protein processes or presents can change what the virus can do at the cell surface. That is the level of the finding: a behavioral difference in the protein, measured in cell systems. [Mount Sinai study identifies single amino acid change that alters Andes virus protein behavior in human cells — Mount Sinai (November 6)]

What the study doesn't show is equally specific. It doesn't show the change makes the virus transmit better between people, infect more easily, or cause worse disease; those claims would need live-virus and epidemiological evidence this work doesn't contain, and the authors don't make them. The value of the result is narrower and real: surveillance sequences from rodent reservoirs and human cases can now be read against a known functional difference, so the one position becomes a thing to watch in the field data. A single letter in a protein rarely settles anything by itself. Mapped carefully, it tells the people watching the virus where to look next. [Mount Sinai study identifies single amino acid change that alters Andes virus protein behavior in human cells — Mount Sinai (November 6)]

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