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Updated: May 16, 2026

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
Published on: January 26, 2024
Design of a phosphorylatable PDZ domain with peptide-specific affinity changes
Colin A Smith1, Catherine A Shi2, Matthew K Chroust3
1Graduate Program in Biological and Medical Informatics, University of California San Francisco, 1700 4(th) Street, San Francisco, CA 94158, USA.
Abstract:
Phosphorylation is one of the most common posttranslational modifications controlling cellular protein activity. Here, we describe a combined computational and experimental strategy to design new phosphorylation sites into globular proteins to regulate their functions. We target a peptide recognition protein, the Erbin PDZ domain, to be phosphorylated by cAMP-dependent protein kinase. Comparing the five successful designs to the unsuccessful cases, we find a trade-off between protein stability and the ability to be modified by phosphorylation. In two designs, Erbin's peptide binding function is modified by phosphorylation, where the presence of the phosphate group destabilizes peptide binding. One of these showed an additional switch in specificity by introducing favorable interactions between a designed arginine in the peptide and phosphoserine on the PDZ domain. Because of the diversity of PDZ domains, this opens avenues for the design of related phosphoswitchable domains to create a repertoire of regulatable interaction parts for synthetic biology.
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