bkoep Staff Lv 1
Actually, interface H-bonds will ideally be buried at the interface. The problem is that massive, nonpolar interfaces are nonspecific—they will bind to any other decoys with a nonpolar surface.
Ideal interface H-bonds confer specificity because they are extremely difficult to satisfy. Decoy binding partners will not satisfy all the interface H-bonds and will not bind; only the designed target will satisfy these H-bonds when it binds the interface.
If you place your H-bond network on the "outer interface," it can probably be satisfied with surrounding water, regardless of the binding partner. This is not ideal, because other nonpolar decoys can still bind just as well as the target.