My TL;DR take on this: thinking of proteins like rigid little single-purpose parts might fall short of the mark. Proteins are kind of wiggly, and nature can easily multi-purpose a given molecule.
Its also, the situation deforms the outcome. Plants deform and grow different in zero gravity, so its carbon nano-machinery, but machinery that uses the circumstances to shape itself. Like a liquid metal terminator, that becomes a bell when meating the casting mold.
Take allergies, here is a hyper active defense system that wants to fight for its life and looks for a challenge.
And it will find its fight and find its challenge, shaping itself accordingly, and if there is no opponent, it will take on the things close enough to it.
Which is why its such a folly to take a creature completely out of its natural environment, like taking away half of what defines the creature. And instead of accepting the mistake, some even dig in further, developing phobias against dirt, parasites and "nature contamination".
Backed up with lots of references. Good read.