Works at 50°C - now I was about to write the AI made a mistake and wanted it to work at 50°F instead, but then this is also no healthy body temperature :)
Part of the world has already started hitting 50°C because of global warming. I guess world getting warmer would means higher chances of such bacteria evolving naturally. India and Pakistan have high population cities with huge waste dumps/land fills so this enzyme or similar evolving naturally is a possibility.