Nuclear and cell division in Bacillus subtilis. Antibiotic-induced morphological changes

Area of Science:

• Microbiology
• Cell Biology
• Bacterial Physiology

Background:

• Bacillus subtilis undergoes coordinated cell division and nuclear division.
• Antibiotics can interfere with bacterial growth and division processes.
• Mesosomes are intracellular membrane structures in bacteria with poorly understood functions.

Purpose of the Study:

• To investigate the effects of antibiotics on Bacillus subtilis cell division.
• To explore the relationship between septation and nuclear division under antibiotic stress.
• To determine the potential role of mesosomes in coordinating bacterial division.

Main Methods:

• Incubation of Bacillus subtilis spores with four different antibiotics at two concentrations.
• Observation of cell septation and nuclear division.
• Three-dimensional reconstruction of bacterial cells to study mesosome location and development.

Main Results:

• Septation in Bacillus subtilis can occur independently of complete nuclear division when exposed to certain antibiotics.
• Antibiotic treatment partially uncoupled septation from the normal bacterial division cycle.
• Mesosome location and development suggest a role in coordinating nuclear and cell division.

Conclusions:

• Mesosomes may play a role in coordinating nuclear and cell division in Bacillus subtilis.
• The observed partial independence of septation and nuclear division under antibiotic influence could be explained by mesosome function.