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Mol. Cell. Biol., May 1996, 2238-2247, Vol 16, No. 5
CD Trainor, JG Omichinski, TL Vandergon, AM Gronenborn, GM Clore and G Felsenfeld
GATA-1, a transcription factor essential for the development of the
erythroid lineage, contains two adjacent highly conserved zinc finger
motifs. The carboxy-terminal finger is necessary and sufficient for
specific binding to the consensus GATA recognition sequence: mutant
proteins containing only the amino-terminal finger do not bind. Here we
identify a DNA sequence (GATApal) for which the GATA-1 amino-terminal
finger makes a critical contribution to the strength of binding. The site
occurs in the GATA-1 gene promoters of chickens, mice, and humans but
occurs very infrequently in other vertebrate genes known to be regulated by
GATA proteins. GATApal is a palindromic site composed of one complete
[(A/T)GATA(A/G)] and one partial (GAT) canonical motif. Deletion of the
partial motif changes the site to a normal GATA site and also reduces by as
much as eightfold the activity of the GATA-1 promoter in an erythroid
precursor cell. We propose that GATApal is important for positive
regulation of GATA-1 expression in erythroid cells.
Copyright © 1996, American Society for Microbiology
A palindromic regulatory site within vertebrate GATA-1 promoters requires both zinc fingers of the GATA-1 DNA-binding domain for high- affinity interaction
Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892, USA.
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