Anthrax edema factor trimer (magenta, cyan, salmon) complex with calmodulin (yellow) and adenine diphosphate derivative, Ca+2 (light green) and Yt+3 (green) ions (PDB code 1pk0).
Anthrax toxin is a three component exotoxin secreted by the bacterium Bacillus Anthracis made up of a binding protein, protective antigen (PA) and two enzyme components edema factor (EF) and lethal factor (LF). [1] See also Toxins.
Alexander Berchansky, Peter Aziz