Fig. 2

Protein and protein graph. Illustration of extracted protein structure graph (right) from the corresponding PDB description of a peptide segment (left) of the S. cerevisiae alpha-factor receptor. The graph is extracted by thresholding the distances between amino acids. The helical structure of the protein (left) gets captured in the corresponding protein graph (right) where, for example, amino acid 4 is linked with amino acid 7