Mycobacterium tuberculosis expresses ftsE gene through multiple transcripts.

Area of Science:

• Microbiology
• Molecular Biology
• Genetics

Background:

• The FtsE protein, an ATP-binding component, works with FtsX in various cellular functions.
• Regulated expression of FtsE and FtsX is potentially crucial for Mycobacterium tuberculosis survival under stress.
• The transcriptional status of the M. tuberculosis ftsE gene (MtftsE) was previously unknown.

Purpose of the Study:

• To analyze the transcriptional status of the MtftsE gene in M. tuberculosis, particularly under stress conditions mimicking the granuloma environment.
• To identify the transcriptional start sites and regulatory elements of MtftsE.

Main Methods:

• Primer extension assays were performed on total RNA from M. tuberculosis under stress conditions.
• Reverse transcription polymerase chain reaction (RT-PCR) was used to confirm co-transcription.
• Putative promoter regions were cloned and tested for transcriptional activity in Mycobacterium smegmatis transformants.

Main Results:

• Four putative transcripts (T1, T2, T3, T4) of MtftsE were identified.
• T1 initiated from the intergenic region, T2 and T3 from within the upstream gene MRA_3135, and T4 upstream of MRA_3135.
• Co-transcription of MRA_3135 and MtftsE was confirmed.
• Promoter activity was validated for T1, T2, and T3.
• No significant modulation of MtftsE transcripts was observed under tested stress conditions.

Conclusions:

• The FtsE gene in M. tuberculosis appears to be transcribed from multiple start sites, including within an upstream gene and intergenic regions.
• MtftsE transcripts are present but not significantly altered under stress conditions relevant to tuberculosis granulomas.
• These findings suggest that MtftsE may not play a stress-specific role in M. tuberculosis.