Spatial and free energy distribution patterns of amino acid residues in water soluble proteins.

We have calculated, for the 20 common amino acid residues: probability density functions that characterize the residues' tendency to occupy different locations in proteins; a propensity scale for the residues to be exposed or buried; mean force potentials that characterize the residues' free energy dependence on their degree of exposure; the average composition of water soluble proteins, and the composition of their core and surface. The nature of differences between different hydrophobicity-related scales is discussed.