(A) Eris scan identifies a stabilizing mutation (T315Y) and destabilizing mutation (R165Y) using μ-OR structural models (Left: inactive state, Right: active state). The mutated tyrosine residues were shown as spheres.
(B) T315Y can mediate hydrogen bond network (Y128-H319-T315Y) and aromatic interactions (T315Y-W318) in the design model, while R165Y disrupts polar interactions with D124 and T279 of μ-OR.