Cysteine engineering of polyproteins for single-molecule force spectroscopy

Hendrik Dietz*, Morten Bertz, Michael Schlierf, Felix Berkemeier, Thomas Bornschlögl, Jan Philipp Junker, Matthias Rief

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


Single-molecule methods such as force spectroscopy give experimental access to the mechanical properties of protein molecules. So far, owing to the limitations of recombinant construction of polyproteins, experimental access has been limited to mostly the N-to-C terminal direction of force application. This protocol gives a fast and simple alternative to current recombinant strategies for preparing polyproteins. We describe in detail the method to construct polyproteins with precisely controlled linkage topologies, based on the pairwise introduction of cysteines into protein structure and subsequent polymerization in solution. Stretching such constructed polyproteins in an atomic force microscope allows mechanical force application to a single protein structure via two precisely controlled amino acid positions in the functional three-dimensional protein structure. The capability for site-directed force application can provide valuable information about both protein structure and directional protein mechanics. This protocol should be applicable to almost any protein that can be point mutated. Given correct setup of all necessary reagents, this protocol can be accomplished in fewer than 10 d.

Original languageEnglish
Pages (from-to)80-84
Number of pages5
JournalNature protocols
Issue number1
Publication statusPublished - 2006 Jun
Externally publishedYes

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology


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