Skip to main content
eScholarship
Open Access Publications from the University of California

Structure-based redesign of the dimerization interface reduces the toxicity of zinc-finger nucleases

  • Author(s): Szczepek, Michal
  • Brondani, Vincent
  • Büchel, Janine
  • Serrano, Luis
  • Segal, David J
  • Cathomen, Toni
  • et al.
Abstract

Artificial endonucleases consisting of a Fokl cleavage domain tethered to engineered zinc-finger DNA-binding proteins have proven useful for stimulating homologous recombination in a variety of cell types. Because the catalytic domain of zinc-finger nucleases (ZFNs) must dimerize to become active, two subunits are typically assembled as heterodimers at the cleavage site. The use of ZFNs is often associated with significant cytotoxicity, presumably due to cleavage at off- target sites. Here we describe a structure- based approach to reducing off- target cleavage. Using in silico protein modeling and energy calculations, we increased the specificity of target site cleavage by preventing homodimerization and lowering the dimerization energy. Cell-based recombination assays confirmed that the modified ZFNs were as active as the original ZFNs but elicit significantly less genotoxicity. The improved safety profile may facilitate therapeutic application of the ZFN technology.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View