Mol. Cell. Biol., Jun 1995, 2907-2915, Vol 15, No. 6
TH Han and R Prywes
Serum induction of c-jun expression in HeLa cells requires a MEF2 site at
-59 in the c-jun promoter. MEF2 sites, found in many muscle-specific
enhancers, are bound by a family of transcription factors, MEF2A through
-D, which are related to serum response factor in their DNA binding
domains. We have found that MEF2D is the predominant protein in HeLa cells
that binds to the c-jun MEF2 site. Serum induction of a MEF2 reporter gene
was not observed in a line of NIH 3T3 cells which contain low MEF2 site
binding activity. Transfection of MEF2D into NIH 3T3 cells reconstituted
serum induction, demonstrating that MEF2D is required for the serum
response. Deletion analysis of MEF2D showed that its DNA binding domain,
when fused to a heterologous transcriptional activation domain, was
sufficient for serum induction of a MEF2 reporter gene. This is the domain
homologous to that in the serum response factor which is required for serum
induction of the c-fos serum response element, suggesting that serum
regulation of c-fos and c- jun may share a common mechanism.
Copyright © 1995, American Society for Microbiology
Regulatory role of MEF2D in serum induction of the c-jun promoter
Department of Biological Sciences, Columbia University, New York, New York 10027, USA.
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