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A recombinant Bacillus subtilis phage, ρ11-AA248, contains the tmr A7-amy R2-amy E+-tmr B+-aroI+ region of the B. subtilis N7 chromosome on a 22.4 kb DNA fragment. The amy E+-tmr B+ gene region in the phage genome of the B. subtilis 207-21 transductants by ρ11-AA248 was amplified to approximately 10 copies after cultivation in the presence of tunicamycin (10 μg/ml) and to two copies without tunicamycin. The amplification of the gene region caused hyper-production of extracellular α-amylase. In contrast, no amplification of the gene region was detected in the transductants of B. subtilis 207-25, a recE-deficient derivative of 207-21 strain.

recE-dependent gene amplification induced by a tunicamycin-resistant mutation (tmrA7) in Bacillus subtilis.