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. 1995 Nov 25;23(22):4698–4706. doi: 10.1093/nar/23.22.4698

The ETS-domain transcription factors Elk-1 and SAP-1 exhibit differential DNA binding specificities.

P Shore 1, A D Sharrocks 1
PMCID: PMC307446  PMID: 8524663

Abstract

The ETS DNA-binding domain is conserved amongst many eukaryotic transcription factors. ETS-domains bind differentially to specific DNA sites containing a central GGA trinucleotide motif. The nucleotides flanking this motif define the binding specificity of individual proteins. In this study we have investigated binding specificity of the ETS-domains from two members of the ternary complex factor (TCF) subfamily, Elk-1 and SAP-1. The ETS DNA-binding domains of Elk-1 (Elk-93) and SAP-1 (SAP-92) select similar sites from random pools of double stranded oligonucleotides based on the consensus sequence ACCGGAAGTR. However, SAP-92 shows a more relaxed binding site selectivity and binds efficiently to a greater spectrum of sites than does Elk-93. This more relaxed DNA binding site selectivity is most pronounced in nucleotides located on the 3' side of the GGA motif. This differential DNA-binding specificity is also exhibited by longer TCF derivatives and, indeed by the full-length proteins. Our results suggest that the range of potential in vivo target sites for SAP-1 is likely to be greater than for Elk-1. We discuss our results in relation to other similar studies carried out with more divergent ETS-domains.

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Selected References

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