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A gene, blmA, from bleomycin (Bm)-producing Streptomyces verticillus, encodes a Bm-binding protein, designated BLMA. The expression of BLMA conferred resistance to Bm in the Escherichia coli host, whereas a mutant protein, designated Pro-9/Leu, with the N-terminal proline 9 residue in BLMA replaced by leucine, did not. We created a fusion protein between the maltose-binding protein (MBP) and a mutant...
The transposon Tn5 carries a gene, ble, which confers resistance to bleomycin (Bm) and gives a survival advantage to its host cell. We found that the ble gene product, designated BLMT, is a binding protein with a strong affinity for Bm. BLMT quenched both the antibacterial and DNA-cleaving activities of Bm, when incubated with the antibiotic. An electron spin resonance spin-trapping analysis showed...
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