Transcription-termination factor Rho from Bacills subtilis.

Area of Science:

• Molecular Biology
• Bacteriology

Background:

• Transcription termination is crucial for gene regulation.
• The transcription termination factor rho from Escherichia coli is well-characterized.
• The existence and function of a similar factor in Bacillus subtilis remained unclear.

Purpose of the Study:

• To isolate and characterize a protein from Bacillus subtilis with functions analogous to E. coli transcription termination factor rho.
• To investigate the biochemical properties and enzymatic activities of the isolated B. subtilis rho factor.
• To determine if the B. subtilis rho factor can mediate transcription termination in vitro.

Main Methods:

• Isolation and purification of the B. subtilis rho factor.
• Biochemical assays including poly(C)-dependent ATPase activity measurement.
• In vitro transcription assays using B. subtilis RNA polymerase holoenzyme and phage rho 29 DNA template.
• Molecular weight determination using non-denaturing and SDS-PAGE electrophoresis.

Main Results:

• A protein with rho factor-like activity was isolated from Bacillus subtilis.
• The B. subtilis rho factor exhibits poly(C)-dependent beta-gamma ATPase activity, albeit with lower specific activity than E. coli rho.
• The B. subtilis rho factor reduced overall RNA synthesis and produced discrete, smaller RNA transcripts from the rho 29 DNA template in vitro.

Conclusions:

• The isolated B. subtilis protein functions as a transcription termination factor.
• This B. subtilis rho factor can catalyze transcription termination at specific sites on phage rho 29 DNA.
• The findings provide insights into prokaryotic transcription regulation mechanisms in Bacillus subtilis.