I'm not sure if it applies to proteins, but for smaller molecules there seemed to be some really interesting results a few years ago about using MOF's to adsorb

I'm not sure if it applies to proteins, but for smaller molecules there seemed to be some really interesting results a few years ago about using MOF's to adsorb analytes in a spatially repeating manner so x-ray diffraction techniques could be used without crystallization. Haven't followed closely enough to know if anything is panning out though.