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. 1995 Feb;15(2):1086–1093. doi: 10.1128/mcb.15.2.1086

A ternary complex factor-dependent mechanism mediates induction of egr-1 through selective serum response elements following antigen receptor cross-linking in B lymphocytes.

S B McMahon 1, J G Monroe 1
PMCID: PMC232012  PMID: 7823924

Abstract

Induction of the primary response gene egr-1 occurs rapidly following antigen receptor cross-linking in B lymphocytes. Antisense studies have demonstrated that this induction is necessary for their subsequent activation to this signal. The present study examines the molecular mechanism whereby the receptor-generated signals interact with the egr-1 promoter to elicit transcription. Deletion mapping and point mutations have indicated that two of the five serum response elements (SREs) in the egr-1 promoter can mediate induction. Of the two critical SREs, both are capable of mediating maximal induction even in the absence of the other SRE. Our results also indicate that adjacent Ets motifs are necessary for induction. Like the c-fos SRE, the egr-1 SRE/Ets sites are occupied by a multiprotein (ternary) complex containing a homodimer of serum response factor and an unidentified member of the Ets family of transcription factors. The identification of a ternary complex-dependent mechanism of egr-1 induction, along with selective utilization of SREs in B lymphocytes, suggests that a complicated array of signaling cascades interacts with unique combinations of regulatory elements in the egr-1 promoter in different cell types.

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Selected References

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