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. 1991 Jul 25;19(14):3921–3927. doi: 10.1093/nar/19.14.3921

Protein-DNA interactions in the cAMP responsive promoter region of the murine ornithine decarboxylase gene.

J J Palvimo 1, L M Eisenberg 1, O A Jänne 1
PMCID: PMC328484  PMID: 1650455

Abstract

To evaluate the function of the murine ornithine decarboxylase (ODC) gene promoter, expression of chimeric ODC-chloramphenicol acetyltransferase (CAT) plasmids (pODCcat) containing 1,658 nt of the ODC promoter sequence and its various 5'-deletions was analyzed. In transient expression assays with NIH/3T3 mouse cells, pODCcat constructs exhibited fairly strong promoter activity yielding CAT values up to 40% of those obtained with the viral promoter RSV. Interestingly, 5'-deletions of the pODCcat constructs increased the promoter activity over that achieved using the entire 1.6-kb 5'-flanking region, with the highest activity being observed with about 750 nt of the ODC promoter. This finding suggests that the distal part of the promoter includes DNA elements which are involved in repressing its function. The promoter region could be deleted down to the proximal 97 nt and still be stimulated by cAMP to the same extent as the 1.6-kb promoter. DNase I footprinting and methylation interference studies showed that a specific protein binds to the region from -59 to -39, which encompasses a DNA motif resembling the consensus cyclic AMP response element (CRE). However, comparative gel retardation and Southwestern blotting experiments with the putative ODC-CRE and the somatostatin promoter CRE indicated that the 70-kDa protein interacting with the CRE-like element of the ODC promoter is different from the well-characterized nuclear CRE-binding protein CREB.

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