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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...
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Protein Engineering by Yeast Surface Display
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Protein sensing with engineered protein nanopores.

Mohammad M Mohammad1, Liviu Movileanu

  • 1Department of Physics, Syracuse University, Syracuse, NY, USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 25, 2012
PubMed
Summary

Researchers engineered alpha-hemolysin (αHL) protein nanopores for controlled single-protein analysis. Attractive electrostatic traps enable precise stochastic sensing of folded proteins, advancing single-molecule science.

Area of Science:

  • Biophysics
  • Nanotechnology
  • Protein Science

Background:

  • Nanopores offer a powerful platform for single-molecule analysis of proteins.
  • The alpha-hemolysin (αHL) protein pore is robust and versatile for biophysical studies.
  • Existing methods explore protein folding, interactions, and enzymatic activity.

Purpose of the Study:

  • To detail a protocol for preparing engineered αHL protein nanopores.
  • To demonstrate nanopore-probe techniques for controlling single proteins.
  • To investigate the use of electrostatic traps for single-molecule sensing.

Main Methods:

  • Preparation of alpha-hemolysin (αHL) protein nanopores.
  • Utilizing nanopore-probe techniques for protein translocation control.

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  • Implementing attractive electrostatic traps for molecular manipulation.

    • Main Results:

    • A detailed protocol for αHL nanopore preparation is provided.
    • Engineered αHL pores enable controlled single-protein manipulation.
    • Electrostatic traps are effective for stochastic sensing of folded proteins.

    Conclusions:

    • Engineered αHL nanopores facilitate precise control over single proteins.
    • Attractive electrostatic traps enhance single-molecule stochastic sensing capabilities.
    • This work advances nanopore-based single-molecule analysis techniques.