Nucleic Acids Research, 1992, Vol. 20, No. 16 4137-4144
© 1992
MOLECULAR BIOLOGY |
Zinc finger-DNA recognition: analysis of base specificity by site-directed mutagenesis
Laboratoire de G
nétique CNRS D 1302, Ecole Normal Supérieure, 46, rue d'Ulm, F–75230 Paris Cedex 05, France
1European Laboratory of Molecular Biology Postfach 102209, Meyerhofstrasse 1, D–6900 Heidelberg, Germany
*To whom correspondence should be addressed
Received June 26, 1992. Accepted July 21, 1992.
Zinc fingers of the Cys2/His2 class are conserved 28 – 30 amino acid motifs that constitute an important and widespread family of eukaryotic DNA-binding domains. It is therefore of great interest to understand the rules that govern specific recognition of DNA by zinc fingers. The DNA-binding domain of the transcription factor Krox–20 consists of three zinc fingers, each of them making its primary contacts with a three-base pair subsite. We have performed a data base-guided site-directed mutagenesis analysis of Krox–20: nine derivatives were generated, in which one to three amino acid changes had been introduced within finger 2, at positions which were likely to affect the specificity of DNA recognition. The affinities of the different proteins for a panel of potential DNA binding sites were estimated by gel retardation assay. Six of the derivatives bound specific targets with affinities comparable to that of wild type Krox–20 for its consensus binding site. However, the specificity of recognition was dramatically modified at the expected bases, in a manner that could be explained by examining the newly Introduced amino acids within the context of the overall finger/triplet interaction. These data provide new insights into the details of zinc finger- DNA interactions and, combined with the modular nature of zinc fingers, illustrate both the potential and the difficulties of utilising these motifs for designing DNA-binding proteins with novel specificities.
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