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Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

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Rational Engineering of the Anthrax Toxin Nanopore Interface for Orthogonal Peptide Classification.

Jennifer M Colby1, Bryan A Krantz2

  • 1Molecular Toxicology Graduate Program, University of California, Berkeley, California 94720, United States.

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|June 22, 2026
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Summary
This summary is machine-generated.

Engineering the anthrax toxin protective antigen (PA) nanopore’s φ-clamp enhances molecular recognition. A mutated variant (F427A) achieves high accuracy for distinguishing peptides, improving biointerface specificity for analytical applications.

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Area of Science:

  • Nanotechnology
  • Biomaterials Science
  • Molecular Engineering

Background:

  • High-performance biointerfaces require precise nanoscale molecular recognition.
  • Wild-type (WT) nanopore channels often lack specificity for chemically similar analytes.

Purpose of the Study:

  • To engineer the anthrax toxin protective antigen (PA) nanopore for enhanced molecular recognition.
  • To create a tunable biointerface with orthogonal selectivity by modifying the φ-clamp active site.

Main Methods:

  • Rational engineering of the φ-clamp constriction in the PA nanopore (F427A mutation).
  • Utilizing WT and F427A variants in a multistage machine learning ensemble (XGBoost).

Main Results:

  • The F427A variant, despite impaired translocation, achieved ~93% accuracy in classifying peptides that confound WT pores.
  • The XGBoost ensemble leveraged complementary selectivity (WT for aromatics, F427A for polar residues) achieving an F1-score >0.91.
  • Demonstrated enhanced specificity of the biointerface for targeted analytical applications.

Conclusions:

  • Rational engineering of nanopore active sites can create tunable biointerfaces with orthogonal selectivity.
  • Attenuating native transport function enhances specificity for targeted analytical applications.
  • Proposes a design principle for multiplexed biomaterials.