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Related Experiment Video

Updated: Nov 26, 2025

Author Spotlight: A Computational Approach to Decipher Amino Acid Preferences in Multispecific Protein-Protein Interactions

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Published on: January 26, 2024

Reprogramming the Specificity of a Protein Interface by Computational and Data-Driven Design.

Regina Hertle¹, Julian Nazet¹, Florian Semmelmann¹

¹Institute of Biophysics and Physical Biochemistry, Regensburg Center for Biochemistry, University of Regensburg, 93040 Regensburg, Germany.

Structure (London, England : 1993)

|December 9, 2020

Summary

Researchers reprogrammed protein interactions by altering glutamine amidotransferase subunits. This study identifies key residues for specific protein complex formation, offering insights into protein interface evolution.

Keywords:

aminodeoxychorismate synthase anthranilate synthase glutamine amidotransferases grafting interface add-on protein design protein specificity switch protein-protein interactions

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Area of Science:

Biochemistry
Structural Biology
Molecular Evolution

Background:

Protein complex formation is crucial for cellular function, yet challenging due to the vast number of proteins.
Glutamine amidotransferase complexes, like anthranilate synthase (AS) and aminodeoxychorismate synthase (ADCS), present a specific challenge due to homologous subunits.

Purpose of the Study:

To identify specific interface residues in the TrpG glutaminase subunit (from AS) that dictate its interaction with the TrpEx synthase subunit.
To understand how these residues prevent binding to the related PabB synthase subunit (from ADCS).
To reprogram protein-protein interaction specificity by modifying the PabA glutaminase subunit.

Main Methods:

Grafting TrpG-specific interface residues into the PabA glutaminase subunit using computational and data-driven approaches.
Assessing the binding affinity of engineered PabA variants to TrpEx and PabB.

Main Results:

Engineered PabA variants demonstrated enhanced binding affinity to the TrpEx synthase subunit compared to the native PabB.
Successful reprogramming of protein-protein interaction specificity was achieved.

Conclusions:

Specific interface residues play a critical role in determining the specificity of protein complex formation.
Protein engineering strategies can be employed to alter and control protein-protein interactions.
This work provides valuable insights into the evolutionary mechanisms driving the adaptation of protein interfaces.