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Extreme mechanical stability in protein complexes.

Lukas F Milles1, Hermann E Gaub1

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Extracellular bacterial adhesins show extreme mechanical stability, withstanding over 2000pN. This review explores their mechanics, function, and molecular mechanisms, highlighting new avenues in protein mechanics research.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Microbiology

Background:

  • Recent discoveries reveal non-covalent protein complexes and folds with exceptional mechanical stabilities.
  • Extracellular adhesin proteins in gram-positive bacteria display significant rupture forces, crucial for bacterial adhesion and survival.

Purpose of the Study:

  • To review and assess the mechanics of protein systems with extreme mechanical stabilities.
  • To discuss biological functions and molecular mechanisms, particularly the role of interaction lifetimes under mechanical load.
  • To explore the implications of these findings for the field of protein mechanics.

Main Methods:

  • Review of existing literature on protein mechanics and bacterial adhesins.
  • Assessment of data from single-molecule force spectroscopy experiments, particularly atomic force microscopy (AFM).

Main Results:

  • Gram-positive bacterial adhesins exhibit rupture forces ranging from 800pN to over 2000pN.
  • Mechanical load can increase protein interaction lifetimes, contributing to stability.
  • Extreme protein strengths open new possibilities for studying protein mechanics.

Conclusions:

  • Bacterial adhesins represent a frontier in understanding extreme protein mechanics.
  • Further research is needed to fully elucidate the biological functions and molecular underpinnings of these stable protein structures.
  • Atomic force microscopy-based single-molecule force spectroscopy is a key technique for probing these systems.