hemolysin

4

ALPHA-HEMOLYSIN from STAPHYLOCOCCUS AUREUS
Protein Data Bank code 7AHL

  1. From the side
  2. From the top of the structure, showing its wonderful symmetry.
  3. Space-filling model from the top, revealing  the symmetry of seven sub-units that unite to form the complete structure.
  4. Space filling model from below, showing how the sub-units create the barrel-like structure seen in the first image.

Hemolysin’s name provides a vital clue to its function. Staphylococcus aureus inserts hemolysin into the membranes of red blood cells, resulting in their rupture, leading to potentially fatal episodes of meningitis, pneumonia, and toxic shock.

(source)