Fig. 2From: Investigation and identification of functional post-translational modification sites associated with drug binding and protein-protein interactionsInvestigation of the five structural characteristics for PTM substrate sites. To characterize PTM substrate sites, the structural characteristics such as (a)Â spatial amino acid composition, (b)Â the orientation of side chains around PTM substrate sites, (c)Â secondary structure of flanking sequences, (d)Â division of acidity and alkaline residues, and (e)Â solvent-accessible surface area were investigatedBack to article page