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Basal and regulated transcription in Archaea
S D Bell1, C P Magill, S P Jackson
1Wellcome Trust and Cancer Research Campaign Institute of Cancer and Developmental Biology, Tennis Court Road, Cambridge, CB2 1QR, UK. sdb@mole.bio.cam.ac.uk
Biochemical Society Transactions
|August 11, 2001
Summary
Archaea
Area of Science:
- Molecular Biology
- Microbiology
- Genetics
Background:
- The archaeal basal transcription machinery shares fundamental similarities with the eukaryotic RNA polymerase (RNAP) II system.
- Archaea utilize a 12-subunit RNAP and two general transcription factors, TBP (TATA-box binding protein) and TFB (TFIIB homologue), for accurate transcription.
- A third factor, TFE (TFIIE homologue), also exists and stimulates transcription under suboptimal promoter recognition conditions.
Purpose of the Study:
- To investigate the functional relationship between archaeal basal transcription machinery and bacterial-like transcriptional regulators.
- To elucidate how bacterial-type regulators interact with the eukaryotic-like basal transcription apparatus in Archaea.
Main Methods:
- Characterization of the mode of action of two specific archaeal transcriptional regulators.
- In vitro transcription assays to assess the impact of regulators on basal transcription.
Main Results:
- Archaeal basal transcription machinery exhibits strong homology to eukaryotic systems.
- Archaeal transcriptional regulators display bacterial characteristics.
- The study characterized how bacterial-like regulators influence the eukaryotic-like basal transcription machinery.
Conclusions:
- Archaea possess a hybrid transcriptional regulatory system, combining eukaryotic-like basal machinery with bacterial-like regulators.
- Understanding these interactions provides insights into the evolution of transcription.