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. 1995 Jan 25;23(2):277–284. doi: 10.1093/nar/23.2.277

High affinity binding sites for the Wilms' tumour suppressor protein WT1.

T B Hamilton 1, K C Barilla 1, P J Romaniuk 1
PMCID: PMC306666  PMID: 7862533

Abstract

The Wilms' tumour suppressor protein (WT1) is a putative transcriptional regulatory protein with four zinc fingers, the last three of which have extensive sequence homology to the early growth response-1 (EGR-1) protein. Although a peptide encoding the zinc finger domain of WT1[-KTS] can bind to a consensus 9 bp EGR-1 binding site, current knowledge about the mechanisms of zinc finger-DNA interactions would predict a more extended recognition site for WT1. Using a WT1[-KTS] zinc finger peptide (WT1-ZFP) and the template oligonucleotide GCG-TGG-GCG-NNNNN in a binding site selection assay, we have determined that the highest affinity binding sites for WT1[-KTS] consist of a 12 bp sequence GCG-TGG-GCG-(T/G)(G/A/T)(T/G). The binding of WT1-ZFP to a number of the selected sequences was measured by a quantitative nitrocellulose filter binding assay, and the results demonstrated that these sequences have a 4-fold higher affinity for the protein than the nonselected sequence GCG-TGG-GCG-CCC. The full length WT1 protein regulates transcription of reporter genes linked to these high affinity sequences. A peptide lacking the first zinc finger of WT1[-KTS], but containing the three zinc fingers homologous to EGR-1 failed to select any specific sequences downstream of the GCG-TGG-GCG consensus sequence in the binding site selection assay. DNA sequences in the fetal promoter of the insulin-like growth factor II gene that confer WT1 responsiveness in a transient transfection assay bind to the WT1-ZFP with affinities that vary according to the number of consensus bases each sequence possesses in the finger 1 subsite.

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Selected References

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