Enterobactin (also known as Enterochelin) is a high affinity siderophore that acquires iron for microbial systems. It is primarily found in Gram-negative bacteria, such as Escherichia coli and Salmonella typhimurium. Enterobactin is the strongest siderophore known, binding to the ferric ion (Fe3+) with the affinity (K = 1052 M-1). This value is su... Found on http://en.wikipedia.org/wiki/Enterobactin