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Mol Cell Biol. 1992 May; 12(5): 2432-2443

Expression cloning of a novel zinc finger protein that binds to the c-fos serum response element.

Cold Spring Harbor Laboratory, New York 11724.

ABSTRACT

Induction of c-fos transcription by serum growth factors requires the serum response element (SRE). The SRE is a multifunctional element which responds to several positively and negatively acting signals. To identify cellular proteins that might mediate functions of the SRE, we screened a human cDNA expression library with an SRE probe. We report the isolation and characterization of SRE-ZBP, a previously unidentified SRE-binding protein. SRE-ZBP is a member of the C2H2 zinc finger family of proteins exemplified by TFIIIA and the Drosophila Krüppel protein. The seven tandemly repeated zinc finger motifs in SRE-ZBP are sufficient for high-affinity binding to the SRE. We show that SRE-ZBP is a nuclear protein and identify a candidate cellular protein encoded by the SRE-ZBP gene. Because we cannot detect any DNA-binding activity attributable to the endogenous protein, we propose that SRE-ZBP activity may be subject to posttranslational regulation. Like c-fos mRNA, SRE-ZBP mRNA is serum inducible in HeLa cells, but with slower kinetics. The role of SRE-ZBP in the regulation of c-fos transcription remains unestablished, but this protein binds to a region of the SRE where mutations lead to derepression.

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