Emerging Themes in PDZ Domain Signaling: Structure, Function, and Inhibition

Area of Science:

• Molecular Biology
• Cell Biology
• Biochemistry

Background:

• Post-synaptic density-95, disks-large and zonula occludens-1 (PDZ) domains are conserved protein modules mediating crucial cellular functions.
• These domains interact with various ligands, including protein C-termini, internal peptides, lipids, and cholesterol.
• PDZ domains are vital for cellular trafficking, ion channel regulation, neuronal signaling, and cytoskeletal dynamics.

Purpose of the Study:

• To review the diverse roles and structural features of PDZ domains in cell signaling.
• To highlight the significance of PDZ domains in biological processes and disease states.
• To discuss the therapeutic potential of targeting PDZ domains with small molecular inhibitors.

Main Methods:

• Literature review of structural and biophysical data on PDZ domains.
• Analysis of PDZ domain interactions with various ligands.
• Examination of the role of PDZ domains in cellular processes and disease.

Main Results:

• PDZ domains possess a conserved structure (∼90 amino acids, two α-helices/six β-strands) enabling diverse ligand binding.
• These domains are critical for cell trafficking, neuronal function, and maintaining cell structure.
• PDZ domain binding can be regulated by phosphorylation and allosteric mechanisms.

Conclusions:

• PDZ domains are essential signaling modules with broad biological relevance.
• Dysfunction of PDZ domains contributes to various diseases, presenting therapeutic opportunities.
• Targeting PDZ domains with small molecules offers a promising therapeutic strategy.