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Using inverse PCR, two new genes (btrN and btrS) were identified upstream of the putative glycosyltransferase gene btrM in the butirosin-biosynthetic btr gene cluster of Bacillus circulans. The upstream gene btrS showed significant homology with stsC of Streptomyces griseus, which encodes L-glutamine:scyllo-inosose aminotransferase in the biosynthesis of streptomycin. The function of BtrS was further confirmed by heterologous expression in Escherichia coli and chemical identification of the conversion of 2-deoxy-scyllo-inosose into 2-deoxy-scyllo-inosamine. The identification of BtrS as L-glutamine:2-deoxy-scyllo-inosose aminotransferase is the first report of the aminotransferase gene responsible for 2-deoxystreptamine biosynthesis.

Identification of L-Glutamine: 2-Deoxy-scyllo-inosose Aminotransferase Required for the Biosynthesis of Butirosin in Bacillus circulans.