I'm purifying a protein which is homotetrameric in nature and each subunit is catalytically active. However, I am a bit uncertain about the molecular weight which I should consider upon calculating the molarity of the given protein because what I believe is that each monomer gets formed independently and then form dimers to attain dimeric or tetrameric configuration.
I do have the concentration which I have obtained via nano-drop. However to obtain the molarity I am not sure to use molecular weight of a monomer (which is catalytically active) or a tetramer?