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Proc Natl Acad Sci U S A
2002 Nov 12;9923:14855-60. doi: 10.1073/pnas.222561499.
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Potentiation of serum response factor activity by a family of myocardin-related transcription factors.
Wang DZ
,
Li S
,
Hockemeyer D
,
Sutherland L
,
Wang Z
,
Schratt G
,
Richardson JA
,
Nordheim A
,
Olson EN
.
???displayArticle.abstract??? Myocardin is a SAP (SAF-A/B, Acinus, PIAS) domain transcription factor that associates with serum response factor (SRF) to potently enhance SRF-dependent transcription. Here we describe two myocardin-related transcription factors (MRTFs), A and B, that also interact with SRF and stimulate its transcriptional activity. Whereas myocardin is expressed specifically in cardiac and smooth muscle cells, MRTF-A and -B are expressed in numerous embryonic and adult tissues. In SRF-deficient embryonic stem cells, myocardin and MRTFs are unable to activate SRF-dependent reporter genes, confirming their dependence on SRF. Myocardin and MRTFs comprise a previously uncharacterized family of SRF cofactors with the potential to modulate SRF target genes in a wide range of tissues.
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