This research investigates the molecular mechanisms that allow coronaviruses to transition between bats and humans by comparing their protein-protein interaction maps. By analyzing SARS-CoV-2 alongside its bat-derived relative RaTG13, scientists identified a critical molecular switch at residue 72 of the Orf9b protein. In humans, this protein binds to Tom70 to bypass immune detection, whereas in bats, it targets MTARC2, which serves as a unique restriction factor that limits viral growth. The study further established a new bat lung cell line, revealing that a single mutation in the viral nucleocapsid is necessary for the virus to replicate effectively in these cells. Ultimately, these findings demonstrate how minor genetic variations allow viruses to overcome species barriers and adapt to different host immune environments. These insights are vital for predicting zoonotic spillover and improving future pandemic preparedness.

References:

• Batra J, Rutkowska M, Zhou Y, et al. Coronavirus protein interaction mapping in bat and human cells reveals network rewiring governing immune evasion and zoonotic potential[J]. Cell Host & Microbe, 2026.

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