Nourseothricin is a broad-spectrum antibiotic derived from Streptomyces noursei. It has been also shown that nourseothricin was able to generate some channels into the outer membrane. Moreover, resistant strains containing a streptothricin-inactivating acetyl transferase exhibited an additional protecting system, namely a reduced penetrability of the outer membrane.
In vivo, animal study showed that nourseothricin was preferentially excreted via kidney and signs of nephrotoxicity could be seen.
| Molecular Weight | 1359.47 |
| Formula | C31H58N12O10.C19H34N8O8.H2SO4 |
| CAS Number | 96736-11-7 |
| Solubility (25°C) | Water 100 mg/mL |
| Storage | 2-8°C |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
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