Study Shows Why COVID-19 Infects Some Animals, But Not Others

A new 3D protein modeling suggests why some animals are more susceptible to coronavirus infection than others.

A new 3D protein modeling suggests why some animals are more susceptible to coronavirus infection than others. The research revealed the difference might be due to distinctive structural features of a protein found on the surface of animal cells.

João Rodrigues of Stanford University, California, and colleagues present these findings in the open-access journal PLOS Computational Biology.

Coronavirus
Coronaviruses infect animals, humans, and birds. Human coronaviruses, such as SARS, MERS, and 2019-nCoV cause respiratory distress and even death. The S protein is the infectious agent of the virus.

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Certain animals' ACE2 "locks" fit the viral "key" better, and that these animals, including humans, are susceptible to COVID-19 infection.

Previous research suggests that the current pandemic began when the virus that causes Covid-19, SARS-CoV-2, jumped from bats or pangolins to humans. Certain other animals, such as cattle and cats, appear to be susceptible to Covid-19, while others, such as pigs and chickens, are not. One zoo even reported infections in tigers. However, it was unclear why some animals are immune and others are not.

To address this question, Rodrigues and colleagues looked for clues in the first step of infection, when SARS-CoV-2's "spike" protein binds to an "ACE2" receptor protein on the surface of an animal cell. They used computers to simulate the proteins' 3D structures and investigate how the spike protein interacts with different animals' ACE2 receptors--similar to checking which locks fit a certain key.

Despite being approximations, the simulations pinpointed certain structural features unique to the ACE2 receptors of these susceptible species. The analysis suggest that other species are immune because their ACE2 receptors lack these features, leading to weaker interactions with spike proteins.

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These findings could aid development of antiviral strategies that use artificial "locks" to trap the virus and prevent it from interacting with human receptors. They could also help improve models to monitor animal hosts from which a virus could potentially jump to humans, ultimately preventing future outbreaks.

"Thanks to open-access data, preprints, and freely available academic software, we went from wondering if tigers could catch Covid-19 to having 3D models of protein structures offering a possible explanation as to why that is the case in just a few weeks," Rodrigues says.

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His team plans to continue refining the computational tools used in this study.

Source-Eurekalert