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Yeast TATA-box transcription factor gene
1Molecular Biology Institute, University of California, Los Angeles CA 90024-1570.
Summary
Researchers purified and cloned the yeast TATA-box transcription factor, a key protein for gene expression. This discovery advances understanding of eukaryotic transcription regulation.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Transcription initiation in eukaryotes relies on transcription factors binding to promoter elements like the TATA-box.
- Understanding these factors is crucial for deciphering gene regulation mechanisms.
Purpose of the Study:
- To identify and characterize the TATA-box binding transcription factor from yeast (Saccharomyces cerevisiae).
- To clone the gene encoding this transcription factor and analyze its properties.
Main Methods:
- Purification of the TATA-box transcription factor using in vitro transcription assays.
- Protein sequencing via Edman degradation and screening of a yeast genomic library.
- Gene cloning, DNA sequencing, and recombinant protein expression in E. coli.
- Chromosomal mapping, mRNA analysis (Northern blot, S1 nuclease), and homology searches.
Main Results:
- A 25 kDa protein with TATA-box binding activity was purified.
- The gene for the TATA-box factor was cloned, encoding a 27,016 Da protein.
- Recombinant protein confirmed TATA-box binding and transcriptional activity.
- The gene mapped to chromosome V; mRNA is 1.3 kb with a long 5' UTR.
- Sequence analysis revealed distant similarity to calpain calcium-binding structures.
Conclusions:
- The TATA-box transcription factor from yeast has been successfully isolated, cloned, and characterized.
- The cloned gene product exhibits the expected DNA-binding and transcription-activating functions.
- Structural homology suggests potential functional insights into DNA binding mechanisms.