Lysobactin, also known as katanosin B, is an effective antibiotic with in vivo efficacy against Staphylococcus aureus and Streptococcus pneumoniae. It was previously shown to inhibit peptidoglycan (PG) biosynthesis.
Teixobactin is a recently described antibiotic . It is a new class produced by a hitherto undescribed soil microorganism (provisionally named Eleftheria terrae).
Aerobactin, as a bacterial iron chelating agent (siderophore), can be found in E. coli. It is a virulence factor that can enable E. coli to sequester iron in iron-poor environments.
Mycobactin S is made from metabolic products of the acid-resistant form of Mycobacterium phlei, a tuberculosis bacillus derived originally from the cold-blooded sea turtle. Importantly, it is not based on cell wall fragments or killed bacteria.