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Functional serum response elements upstream of the growth factor-inducible gene zif268.The induction is coordinate with that of c-fos. Paper-1827.
We conclude that the zif268 SRE-like sequences are functional and probably account for the coordinate induction of zif268 and c-fos. Paper-1827.
Each of the zif268 SREs also competed with the c-fos SRE for binding by serum response factor present in HeLa cell nuclear extract. Paper-1827.
Each of the four SREs conferred inducibility by the agents tested, and multiple SREs resulted in greater inducibility than did a single element.
In addition, double-stranded oligonucleotides corresponding to each of the four zif268 putative SREs were tested individually for responsiveness when placed upstream of a thymidine kinase gene promoter. Paper-1827.
The zif268 gene, which encodes a protein with three typical zinc finger sequences, is induced in mouse 3T3 cells by serum, phorbol 12-myristate 13-acetate platelet-derived growth factor, and fibroblast growth factor. Paper-1827.
The 5'-flanking region of zif268 contains sequences that resemble known regulatory elements, including four CC(A or T)6GG sequences similar to the core serum response elements (SREs) found upstream of c-fos and actin genes. Paper-1827.
To determine whether the zif268 SRE-like elements mediate induction, CAT ( chloramphenicol acetyltransferase) plasmids with different lengths of zif268 upstream sequences were tested for inducibility in 3T3 cells by serum, platelet-derived growth factor, or phorbol 12-myristate 13-acetate. Paper-1827.
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