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Replication genes of plasmid pE194-cop and repF: transcripts and encoded proteins
1Pharmacology Department, University of Wisconsin Medical School, Madison 53706.
Journal of Bacteriology
|October 1, 1990
Summary
Plasmid pE194 replication involves two key proteins, Cop and RepF, transcribed clockwise. The Cop protein acts as a negative regulator, controlling its own synthesis and that of RepF.
Area of Science:
- Molecular Biology
- Microbial Genetics
Background:
- Plasmid pE194 replication is regulated by specific genes.
- Understanding transcription patterns is crucial for plasmid stability.
Purpose of the Study:
- To investigate the in vivo transcription of the pE194 replication region.
- To characterize the proteins encoded by the cop and repF genes.
- To elucidate the regulatory mechanism of pE194 replication.
Main Methods:
- In vivo transcription analysis in Bacillus subtilis minicells.
- Electrophoretic analysis of protein products.
- N-terminal sequencing of fusion proteins.
- DNA sequence analysis.
Main Results:
- Two mRNA classes encoding Cop and RepF proteins were identified, transcribed clockwise.
- The cop gene encodes a 55-amino-acid protein (6 kDa).
- Four repF transcripts were detected, with the longest (720 nucleotides) coding for the full-length RepF protein (216 amino acids).
Conclusions:
- Cop functions as a protein, not an RNA countertranscript.
- Cop protein acts as a negative regulator of pE194 replication, controlling RepF and its own synthesis.
- Mutations affecting Cop activity or synthesis can lead to increased plasmid copy number.