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Nourseothricin ( NTC) is a member of the streptothricin-class of aminoglycoside antibiotics produced by Streptomyces species. Chemically, NTC is a mixture of the related compounds streptothricin C, D, E, and F. NTC inhibits protein synthesis by inducing miscoding. It is used as a selection marker for a wide range of organisms including bacteria, yeast, filamentous fungi, and . It is not known to have adverse side-effects on positively selected cells, a property cardinal to a selection drug.
Streptothricin F is effective against highly drug-resistant gram-negative bacteria, including Carbapenem-resistant E. coli.
NTC can be inactivated by nourseothricin N-acetyl transferase (NAT) from Streptomyces noursei, an enzyme that Acetylation the beta-amino group of the beta-lysine residue of NTC. NAT can thus act as an antibiotic resistance gene.
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