2009
DOI: 10.1038/ja.2009.116
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Monooxygenation of rifampicin catalyzed by the rox gene product of Nocardia farcinica: structure elucidation, gene identification and role in drug resistance

Abstract: We demonstrated that the rox gene of Nocardia farcinica encodes a rifampicin monooxygenase capable of converting rifampicin to a new compound 2¢-N-hydroxy-4-oxo-rifampicin with a markedly lowered antibiotic activity. The deletion mutation (Drox) of the rox gene gave no significant influence to the rifampicin resistance of N. farcinica. However, transformation with a plasmid containing an overexpressing the rox gene markedly raised the rifampicin resistance in the strain with the deletion mutation of the rpoB2 … Show more

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Cited by 43 publications
(59 citation statements)
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“…These features are indicative of a well folded flavoenzyme. These results confirm that RIFMO is a flavoenzyme, which is consistent with the prediction based on sequence analysis (13).…”
Section: Resultssupporting
confidence: 80%
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“…These features are indicative of a well folded flavoenzyme. These results confirm that RIFMO is a flavoenzyme, which is consistent with the prediction based on sequence analysis (13).…”
Section: Resultssupporting
confidence: 80%
“…The enzyme was discovered from pathogenic Nocardia farcinica (15). Phylogenetic analysis suggests that RIFMO is distinguishable from other known flavoprotein monooxygenases (13). A highly similar gene (iri) that confers moderate RIF resistance was also found in Rhodococcus equi (12).…”
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confidence: 98%
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“…These covalent modifications occur on the critical hydroxyls of the 1-amino, 2-naphthol, 4-sulfonic acid (ansa) chain of rifamycins and thus make rifamycins unable to fit into the binding pocket on RNAP. Additional resistance mechanisms have been reported also (14)(15)(16).…”
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confidence: 99%