I recommend reading this: https://www.amazon.co.uk/Melt/dp/B07PNKNBCT/ref=nodl_?dplnkId=c0cca0d6-2c11-4c97-ae51-d87ba14f02cd
A decent series of books based on this scenario, an enzyme which can ‘eat’ plastic. Sounds great until it escapes and eats every bit of plastic in its path.