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M-CAT binding factor is related to the SV40 enhancer binding factor, TEF-1
I K Farrance1, J H Mar, C P Ordahl
1Department of Anatomy, University of California, San Francisco 94143-0452.
The Journal of Biological Chemistry
|August 25, 1992
Summary
M-CAT binding factor (MCBF), crucial for cardiac troponin T gene activity, is identified as transcription enhancer factor-1 (TEF-1). This muscle-specific factor plays a key role in regulating contractile protein genes.
Area of Science:
- Molecular Biology
- Gene Regulation
- Cardiovascular Science
Background:
- M-CAT binding factor (MCBF) regulates the cardiac troponin T gene promoter.
- M-CAT motifs are involved in other contractile protein gene regulation, independent of MyoD1.
- The precise identity and function of MCBF were under investigation.
Purpose of the Study:
- To identify and characterize the M-CAT binding factor (MCBF).
- To determine the relationship between MCBF and known transcription factors.
- To elucidate the role of MCBF/TEF-1 in muscle-specific gene expression.
Main Methods:
- Mutational analysis of the M-CAT motif.
- Functional replacement with SV40 enhancer motif binding TEF-1.
- Biochemical analyses including DNA-agarose fractionation and molecular weight determination.
- Immunological assays using antibodies against human TEF-1.
Main Results:
- The M-CAT motif can be functionally replaced by the TEF-1 binding motif.
- MCBF from muscle nuclei exhibits indistinguishable properties from TEF-1.
- Antibodies against human TEF-1 recognize MCBF in chicken muscle.
- MCBF/TEF-1 is highly enriched in striated muscle nuclei.
Conclusions:
- M-CAT binding factor (MCBF) is closely related or identical to transcription enhancer factor-1 (TEF-1).
- TEF-1 plays a significant role in the muscle-specific regulation of contractile protein genes.
- The enrichment of MCBF/TEF-1 in muscle nuclei supports its function in striated muscle promoter regulation.