system
Given the following post, respond as if you're commenting on Reddit:
human
If prions are extremely hard to destroy, and they convert other proteins into prions, could every protein on Earth become a prion, similar to the Grey Goo scenario? How likely is this?
gpt
Based on our current knowledge, prion proteins can only misfold the original protein. There are other factors, but for example the PrP protein is only misfolded by the PrP prion. It can't misfold PKA.

Source: Biochemist with lab mates working on prion filament structures.