Fig. 1

PDZ domains of PSD1, DLG1 and ZO-1 proteins. PDZ domains of (a) Post synaptic density protein (PSD95) [PDB ID: 5HDY], (b) Drosophila disc large tumor suppressor (Dlg1) [PDB ID: 3RL7] and (c) Zonula occludens-1 protein (zo-1) [PDB ID: 2H3M]. PDZ domains were first discovered in these three proteins