An online tool can help researchers synthesize millions of molecules

Enzymes are substances that cause chemical reactions. Certain types of enzymes, such as polyketide synthases and nonribosomal peptide synthetases, have the ability to shuffle their parts, allowing them to produce new chemicals. If scientists can understand how these enzymes shuffle their parts, they can understand how to use them to synthesize millions of molecules, such as pharmaceuticals and biofuels. However, engineering these enzymes is difficult because scientists don't fully understand how they work.