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Identification of transcriptional activation and inhibitory domains in serum response factor (SRF) by using GAL4-SRF constructs.

Department of Biological Sciences, Columbia University, New York, New York 10027.

ABSTRACT

The binding of serum response factor (SRF) to the c-fos serum response element has been shown to be essential for serum and growth factor activation of c-Fos. Since SRF is ubiquitously expressed, it has been difficult to measure the activity of SRF introduced into cells. To assay for functions of SRF in cells, we have changed its DNA binding specificity by fusing it to the DNA binding domain of GAL4. Transfection of GAL4-SRF constructs into cells has allowed us to identify SRF's transcriptional activation domain as well as domains which inhibit this activity. First, we found that the transcriptional activation domain maps to between amino acids 339 and 508 in HeLa cells and to between amino acids 414 and 508 in NIH 3T3 cells. Second, we show that in the context of GAL4-SRF constructs, there are two separate domains of SRF that can inhibit its activation domain. Although these domains overlap the DNA binding and dimerization domains of SRF, these functions were not required for inhibition. Finally, we show that one of the inhibitory domains is modular in that it can also inhibit activation when it is moved amino terminal to GAL4's DNA binding domain in an SRF-GAL4-SRF construct. The implications of these inhibitory domains for SRF regulation are discussed.

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