Mechanical design of proteins studied by single-molecule force spectroscopy and protein engineering.

Journal Academic Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, U.S. Gov't, P.H.S., Review

Mechanical unfolding and refolding may regulate the molecular elasticity of modular proteins with mechanical functions. The development of the atomic force microscopy (AFM) has recently enabled the dynamic measurement of these processes at the single-molecule level. Protein engineering techniques allow the construction of homomeric polyproteins for the precise analysis of the mechanical unfolding of single domains. alpha-Helical domains are mechanically compliant, whereas beta-sandwich domains, particularly those that resist unfolding with backbone hydrogen bonds between strands perpendicular to the applied force, are more stable and appear frequently in proteins subject to mechanical forces. The mechanical stability of a domain seems to be determined by its hydrogen bonding pattern and is correlated with its kinetic stability rather than its thermodynamic stability. Force spectroscopy using AFM promises to elucidate the dynamic mechanical properties of a wide variety of proteins at the single molecule level and provide an important complement to other structural and dynamic techniques (e.g., X-ray crystallography, NMR spectroscopy, patch-clamp).

Duke Authors

Cited Authors

  • Carrion-Vazquez, M; Oberhauser, AF; Fisher, TE; Marszalek, PE; Li, H; Fernandez, JM

Published Date

  • 2000

Published In

Volume / Issue

  • 74 / 1-2

Start / End Page

  • 63 - 91

PubMed ID

  • 11106807

International Standard Serial Number (ISSN)

  • 0079-6107

Language

  • eng

Citation Source

  • PubMed