Lecture Notes: Axial Filament

Overview

• Axial Filament: A special type of flagella, also known as an endoflagella.

Characteristics

• Attachment: Attached at one end of the organism.
• Structure: Coils around the organism.
• Function: Used for movement similar to other types of flagella.

Organisms with Axial Filament

• Exclusively found in spiral-shaped bacteria.

Key Examples

1. Treponema pallidum:
   • Causative agent of syphilis.
   • Moves in a corkscrew fashion.
2. Borrelia burgdorferi:
   • Causative agent of Lyme disease.

Movement Mechanism

• Action: When the axial filament contracts, it causes the cell to spin.
• Analogy: Similar to a drill bit where the organism can "drill" itself forward or backward.

Visual Representation

• Treponema pallidum:
  • Demonstrates a corkscrew appearance.
  • Capable of moving towards or away from stimuli by contracting its axial filament.

Conclusion

• The axial filament is essential for movement in spiral-shaped bacteria, allowing them to navigate their environment efficiently.
• Remember: This type of flagella is specific to spiral-shaped bacteria and plays a crucial role in their pathogenicity.

Reminder

• Have a wonderful day and be blessed!