Nucleic Acids Research, 1993, Vol. 21, No. 17 4103-4110
© 1993
MOLECULAR BIOLOGY |
Both a ubiquitous factor mTEF-1 and a distinct muscle-specific factor bind to the M-CAT motif of the myosin heavy chain ß gene
1Molecular Medicine, Department of Medicine Boston, MA 02215, USA 2Cardiovascular Divisions, Program in Cell and Developmental Biology, Harvard Medical School Boston, MA 02215, USA
*To whom correspondence should be addressed at: Molecular Medicine Unit, Beth Israel Hospital, 330 Brooldine Avenue, Boston, MA 02215, USA
Received April 16, 1993. Revised July 23, 1993. Accepted July 23, 1993.
The A element, a fourteen base pair sequence in the rabbit myosin heavy chain (HC) ß promoter (-276/- 263), contains the M-CAT motif, a cis-acting element found in several muscle-specific genes. The A element is essential for muscle-specific transcription of the myosin HCß gene. Recently, we have identified both muscle-specific and ubiquitous factors (A1 and A2 factors, respectively) that bind to the A element. Since the sequence of the A element is very similar to the GTIIC motif In the SV40 enhancer, we examined the relationship between A-element-binding factors and a GTIIC binding factor TEF-1, recently isolated from HeLa cells. The GTIIC motif was bound by the A1 and A2 factors in muscle nuclear extracts and competed with the A element for DNA-protein complex formation. Antibody against human TEF-1 'supershifted' the ubiquitous A2 factor- DNA complex, but did not alter the mobility of the muscle-specific A1 factor-DNA complex. We Isolated a murine cDNA clone (mTEF-1) from a cardiac cDNA library. The clone is highly homologous to Hela cell TEF-1. The In vitro transcription/translation product of mTEF-1 cDNA bound to the A element, and the DNA binding property of mTEF-1 was Identical to that of the A2 factor. Transfection of mTEF-1 cDNA into muscle and non-muscle cells confirmed that mTEF-1 corresponds to A2, but not to A1 factors. The mTEF-1 mRNA Is expressed abundantly in skeletal and cardiac muscles, kidney and lung, but it is also expressed at lower levels in other tissues. These results suggest that the M-CAT binding factors consist of two different factors; the ubiquitous A2 Is encoded by mTEF-1, but the muscle-specific A1 factor is distinct from mTEF-1.
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