The research team then conducted domain swapping experiments by creating a chimera library, which is a collection of mutant enzymes created from the two parent enzymes. (sciencedaily.com)
There's speculation that, with further mutations, the PETase mutant enzyme might even be used to degrade / eat the newer kinds of plastic known as Polyethylene furandicarboxylate or PEF. (bigthink.com)
Fersht and his colleagues replaced these stretches in IGPS with snippets of random compositions and varying lengths, creating a library of mutant enzymes. (sciencemag.org)