Identification of the functional domains of the transcriptional regulator CRE-BP1.

We present evidence that CRE-BP1 binding to the cyclic AMP (cAMP) response element (CRE) is a transcriptional activator. Transcriptional activation was assayed by cotransfection into CV-1 cells of a CRE-BP1 expression plasmid together with a reporter plasmid in which the thymidine kinase promoter and four tandem repeats of CRE were linked to the chloramphenicol acetyltransferase (CAT) gene. Cotransfection with the CRE-BP1 expression plasmid caused an 8-fold stimulation of CAT activity, while cotransfection with the plasmids to express CRE-BP1 and c-Jun induced a 32-fold stimulation of CAT activity, suggesting that a heterodimer of CRE-BP1 with c-Jun is a stronger trans-activator than a homodimer of CRE-BP1. By using a series of deletion and point mutants of CRE-BP1 in this cotransfection assay, two functional domains of CRE-BP1 were identified: the putative metal finger structure in the amino-terminal region and the leucine zipper motif linked to a cluster of basic amino acids in the carboxyl-terminal region. The former was a transcriptional activation domain in the absence of c-Jun. The latter was a DNA-binding domain, and was essential in both the presence and absence of c-Jun.

• Publication year

  1991

• Venue

  Journal of Biological Chemistry

• Publication date

  1991-09-25

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0021-9258(18)55253-4PMID 1833393
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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