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Mol. Cell. Biol., 03 1995, 1489-1498, Vol 15, No. 3
Copyright © 1995, American Society for Microbiology

Sequence and structural requirements for high-affinity DNA binding by the WT1 gene product

H Nakagama, G Heinrich, J Pelletier and DE Housman
Center for Cancer Research, Massachusetts Institute of Technology, Cambridge 02139.

The Wilms' tumor suppressor gene, WT1, encodes a zinc finger polypeptide which plays a key role regulating cell growth and differentiation in the urogenital system. Using the whole-genome PCR approach, we searched murine genomic DNA for high-affinity WT1 binding sites and identified a 10-bp motif 5'GCGTGGGAGT3' which we term WTE). The WTE motif is similar to the consensus binding sequence 5'GCG(G/T)GGGCG3' recognized by EGR-1 and is also suggested to function as a binding site for WT1, setting up a competitive regulatory loop. To evaluate the underlying biochemical basis for such competition, we compared the binding affinities of WT1 and EGR1 for both sequences. WT1 shows a 20- to 30-fold-higher affinity for the WTE sequence compared with that of the EGR-1 binding motif. Mutational analysis of the WTE motif revealed a significant contribution to binding affinity by the adenine nucleotide at the eighth position (5'GCGTGGGAGT3') as well as by the 3'-most thymine (5'GCGTGGGAGT3'), whereas mutations in either flanking nucleotides or other nucleotides in the core sequence did not significantly affect the specific binding affinity. Mutations within WT1 zinc fingers II to IV abolished the sequence-specific binding of WT1 to WTE, whereas alterations within the first WT1 zinc finger reduced the binding affinity approximately 10-fold but did not abolish sequence recognition. We have thus identified a WT1 target, which, although similar in sequence to the EGR-1 motif, shows a 20- to 30-fold- higher affinity for WT1. These results suggest that physiological action of WT1 is mediated by binding sites of significantly higher affinity than the 9-bp EGR-1 binding motif. The role of the thymine base in contributing to binding affinity is discussed in the context of recent structural analysis.


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