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Structure and function of the small subunit of TFIIF (RAP30) from Drosophila melanogaster
D J Frank1, C M Tyree, C P George
1Department of Biology, University of California at San Diego, La Jolla 92093-0347.
The Journal of Biological Chemistry
|March 17, 1995
Summary
Researchers isolated Drosophila TFIIF30 to study basal transcription. The carboxyl-terminal region of dTFIIF30 mediates RNA polymerase II interaction for transcription, while the amino terminus binds TFIIF74.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Basal transcription by RNA polymerase II is a fundamental process.
- TFIIF (Transcription Factor II F) is crucial for transcription initiation.
- Understanding the subunits of TFIIF provides insight into transcriptional regulation.
Purpose of the Study:
- To isolate and characterize the Drosophila homologue of the small subunit of TFIIF (dTFIIF30).
- To investigate the functional domains of dTFIIF30 in basal transcription.
- To elucidate the interaction between dTFIIF30 and the large subunit of TFIIF (TFIIF74).
Main Methods:
- cDNA isolation and cloning of Drosophila TFIIF30.
- Protein synthesis and purification of dTFIIF30 in E. coli.
- Reconstituted transcription assays with purified basal factors.
- Glycerol gradient sedimentation to analyze protein complex formation.
Main Results:
- Drosophila TFIIF30 was successfully synthesized and purified.
- dTFIIF30 exhibited specific activity identical to its human homologue in transcription reactions.
- A carboxyl-terminal fragment (dF30(119-276)) retained 50% of full-length transcriptional activity.
- dTFIIF30, but not the fragment, formed a stable complex with TFIIF74.
Conclusions:
- The carboxyl-terminal region of dTFIIF30 is a functional domain interacting with RNA polymerase II for basal transcription.
- The amino terminus of dTFIIF30 interacts with TFIIF74, forming a heteromeric complex.
- These findings support a model for dTFIIF30 function in transcription initiation.