Design of polydactyl zinc-finger proteins for unique addressing within complex genomes

AUTOR(ES)

Liu, Qiang

FONTE

The National Academy of Sciences of the USA

RESUMO

Zinc-finger proteins of the Cys2-His2 type represent a class of malleable DNA-binding proteins that may be selected to bind diverse sequences. Typically, zinc-finger proteins containing three zinc-finger domains, like the murine transcription factor Zif268 and the human transcription factor Sp1, bind nine contiguous base pairs. To create a class of proteins that would be generally applicable to target unique sites within complex genomes, we have utilized structure-based modeling to design a polypeptide linker that fuses two three-finger proteins. Two six-fingered proteins were created and demonstrated to bind 18 contiguous bp of DNA in a sequence-specific fashion. Expression of these proteins as fusions to activation or repression domains allows transcription to be specifically up- or down-modulated within human cells. Polydactyl zinc-finger proteins should be broadly applicable as genome-specific transcriptional switches in gene therapy strategies and the development of novel transgenic plants and animals.

Documentos Relacionados

• KRAB-containing zinc-finger repressor proteins
• A unique bipartite cysteine-histidine motif defines a subfamily of potential zinc-finger proteins.
• Use of a zinc-finger consensus sequence framework and specificity rules to design specific DNA binding proteins.
• A novel four zinc-finger protein targeted against p190BcrAbl fusion oncogene cDNA: utilisation of zinc-finger recognition codes
• Targeted mutagenesis using zinc-finger nucleases in Arabidopsis