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Mol Cell Biol. 1993 November; 13(11): 7163-7169
Ets proteins: new factors that regulate immunoglobulin heavy-chain gene expression.
R R Rivera,
M H Stuiver,
R Steenbergen and
C Murre
Department of Biology, University of California, San Diego, La Jolla 92122.
ABSTRACT
We used a DNA-protein interaction screening method to isolate a cDNA, Erg-3, whose product binds to a site, designated pi, present in the immunoglobulin (Ig) heavy-chain gene enhancer. Erg-3 is an alternatively spliced product of the erg gene and contains an Ets DNA-binding domain. Fli-1 and PU.1, related Ets proteins, also bind to the same site. In addition, PU.1 binds to a second site, designated microB, in the Ig heavy-chain enhancer. We demonstrate that the pi binding site is crucial for Ig heavy-chain gene enhancer function. In addition, we show that Erg-3 and Fli.1, but not PU.1, can activate a reporter construct containing a multimer of protein-binding sites, synergistically with helix-loop-helix protein E12. We discuss how combinatorial interactions between members of the helix-loop-helix and Ets families may account for the tissue specificity of these proteins.
Mol Cell Biol. 1993 November; 13(11): 7163-7169
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