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The receptors have these floppy loops which are great for bending into the right conformation to recognise different things. It turns out that if they have a few aromatic residues they just happen to recognise carbon nanotubes. It’s unlikely this is something that evolved, and much more just some bad luck in recognising this particular shape.

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Wouldn't an aromatic loop have a high affinity for anything with some relatively large / low density (amenable to moving around) electron field?

Something that tickles me about this idea is that, if you think of proteins recognizing these small molecules as lock-and-key (I know that model is outmoded), this is the equivalent of a self-impressioning attack (like the Bic pen attack on cheap tubular locks).

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