Your key and lock analogy is simply incorrect. Those interactions can be modeled with classic electrochemistry and are super predictive - the specificity is driven by evolution, not quantum mechanics. I mean sure, every system is technically quantum mechanical but those effects are never explored afaik.
There are even educational demonstrations where people shake bags of 3D printed proteins with magnets (including competing proteins) and you end up with the expected structure.
There are even educational demonstrations where people shake bags of 3D printed proteins with magnets (including competing proteins) and you end up with the expected structure.