Getting your proteins in a row: Self-assembled protein nanowires were designed by utilizing highly specific supramolecular interactions of cucurbit[8]uril (CB[8]) and a tripeptide FGG-tag attached on the N-termini of dimeric glutathione S-transferase (GST). With the aid of enzyme simulation, model protein GST was converted into a selenoenzyme glutathione peroxidase mimic, and the CB[8]-induced Se-FGG-GST(Y6C) nanowires demonstrated excellent antioxidative capacity.