Open AccessTarget Gene-Specific Modulation of Myocardin Activity by GATA Transcription Factors
Author(s) -
Jiyeon Oh,
Zhigao Wang,
Da Zhi Wang,
Ching Ling Lien,
Weibing Xing,
Eric N. Olson
Publication year - 2004
Publication title -
molecular and cellular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.14
H-Index - 327
eISSN - 1067-8824
pISSN - 0270-7306
DOI - 10.1128/mcb.24.19.8519-8528.2004
Subject(s) - myocardin , coactivator , biology , transcription factor , gata4 , psychological repression , transcription (linguistics) , serum response factor , gene , microbiology and biotechnology , gene expression , genetics , linguistics , philosophy
Myocardin is a transcriptional coactivator that regulates cardiac and smooth muscle gene expression by associating with serum response factor. We show that GATA transcription factors can either stimulate or suppress the transcriptional activity of myocardin, depending on the target gene. Modulation of myocardin activity by GATA4 is mediated by the physical interaction of myocardin with the DNA binding domain of GATA4 but does not require binding of GATA4 to DNA. Paradoxically, the transcription activation domain of GATA4 is dispensable for the stimulatory effect of GATA4 on myocardin activity but is required for repression of myocardin activity. The ability of GATA transcription factors to modulate myocardin activity provides a potential mechanism for fine tuning the expression of serum response factor target genes in a gene-specific manner.