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Pseudonocardia are filamentous actinomycetes with ~6Mbp circular genomes, best known as vertically transmitted mutualists of fungus-growing attine ants. Leafcutter ant associated strains make polyene antifungals that are variants of nystatin A1, with additional hexose sugar groups. Less highly evolved attires are associated with Pseudonocardia strains that make depsipeptide antibiotics

Further reading:

Li H, Sosa-Calvo J, Horn HA, Pupo MT, Clardy J, Rabeling C, Schultz TR and Currie CR (2018). Convergent evolution of complex structures for ant–bacterial defensive symbiosis in fungus-farming ants. PNAS 115:10720-10725;

Holmes N, Innocent T, Heine D, Worsley S, Findlay K, Murrell J.C., Wilkinson B, Boomsma JJ and Hutchings MI (2016). Genome analysis of two Pseudonocardia phylotypes associated with Acromyrmex leafcutter ants reveals their biosynthetic potential. Front Microbiol. 7:2073.

Andersen SB, Hansen LH, Sapountzis P, Sørensen SJ and Boomsma JJ (2013). Specificity and stability of the Acromyrmex-Pseudonocardia symbiosis. Molecular Ecology 22:4307-4321.