Some proteins are just "architectural scaffolding" that physically hold other enzymes in place to speed up chemical reactions.

In the creation of alkaloids, certain MDR proteins do not actually perform any chemistry themselves. Instead, they act as physical supports that organize other enzymes into a specific 3D shape. This arrangement allows reactive chemicals to be passed directly from one enzyme to the next without leaking away. It makes the entire biological factory much more efficient and allows for a wider variety of complex molecules to be built. This reveals a new level of cellular organization where doing nothing is actually the most important job.