中国生物工程杂志

A novel gene, located between dnrX and drrB in the genome of daunorubicin-producing strain Streptomyces coeruleorubidus SIPI-1482, was cloned and named as dauW. The full sequence of dauW was submitted to GenBank (Accession No.EF523565). Blast result indicated that it showed high homology with dnrW in GenBank. The exact function of dauW is as yet unknown despite the possibility that it might belong to a family of FAD-dependent oxidoreductases on the basis of conserved domain analysis. dauW was cloned into expression plasmids pET-28a(+) and pET-32a(+), respectively, and was successfully expressed in E.coli DE3 after induction with IPTG. The preliminary results of the expression of dauW suggested that it might be involved in the self resistance in Streptomyces coeruleorubidus due to the increased resistance to daunorubicin in the E.coli host.