Hantavirus Research Paves Way for Vaccines and Therapies

New research from the University of Texas at Austin has revealed a detailed structural blueprint of a protein complex used by the Andes virus, a potentially pandemic hantavirus, to infect host cells. This breakthrough, published in the journal Cell, represents a crucial step toward developing much-needed vaccines and antibody therapies for hantaviruses, which currently have no approved treatments.

The Threat of Hantaviruses

Hantaviruses are transmitted from rodents to humans and have a mortality rate of around 40%. Found worldwide, these viruses are considered a significant pandemic threat. The viruses gained public attention in 2024 when Betsy Arakawa, the wife of actor Gene Hackman, died from a hantavirus infection in New Mexico. Source

Mapping the Viral Infection Process

Researchers focused on the Andes virus, specifically a mushroom-shaped structure called a Gn-Gc tetramer, which is a surface protein complex the virus uses to infect cells. Using cryo-electron microscopy, the team created high-resolution, three-dimensional structures of this complex. Source

Achieving Ultra-High Resolution

To achieve a resolution of 2.3 angstroms – detailed enough to capture features at the atomic level – researchers employed a specialized reconstruction method. They isolated and analyzed shadows from tetramers oriented laterally to the electron beam, effectively improving upon previous models that had a resolution of 12 angstroms. This enhanced clarity is essential for accurate vaccine and therapy design. Source

Implications for Vaccine Development

The detailed structural information obtained allowed the researchers to create a vaccine candidate that, when tested in mice, elicited the production of neutralizing antibodies against the Andes virus. The research highlights the importance of mimicking the surface proteins in their pre-infection state for optimal vaccine and antibody therapy effectiveness. Source

Future Research Directions

The team plans to use artificial intelligence tools to identify stabilizing mutations that can help fix the viral protein complexes in their pre-infection configuration. This will further refine the development of effective vaccines and antibody therapies against hantaviruses. Source