Electron Communication of Bacillus subtilis in Harsh Environments

Area of Science:

• Microbiology
• Environmental Science
• Biochemistry

Background:

• Understanding microbial resilience in extreme environments is crucial for astrobiology and biotechnology.
• Many microbial survival strategies involve electron transfer phenomena.
• Investigating non-extremophilic microbes offers insights into fundamental survival mechanisms.

Purpose of the Study:

• To determine if Bacillus subtilis can survive extreme temperatures and acidic conditions.
• To elucidate the mechanisms employed by B. subtilis for survival in harsh environments.
• To explore the role of extracellular electron transfer in microbial stress response.

Main Methods:

• Subjecting Bacillus subtilis to temperatures of 100°C for up to 8 hours.
• Exposing B. subtilis to a pH of 1.50 for over 2 years.
• Analyzing the involvement of nicotinamide adenine dinucleotide (NAD) in survival.

Main Results:

• Bacillus subtilis maintained activity after exposure to extreme temperatures (100°C).
• B. subtilis survived prolonged exposure to highly acidic conditions (pH 1.50).
• Extracellular electron transfer, with NAD as a cofactor, was identified as a key survival mechanism.

Conclusions:

• Non-acidophilic and non-thermophilic Bacillus subtilis exhibits remarkable resilience to extreme environmental conditions.
• Extracellular electron transfer serves as a vital communication pathway for B. subtilis to maintain viability.
• This study enhances understanding of microbial energy conservation and adaptation strategies in extreme environments.