Hashiguchi K, Tanimoto A, Nomura S, Yamane K, Yoda K, Harada S, Mori M, Furusato T, Takatsuki A, Yamasaki M. Amplification of the amyE-tmrB region on the chromosome in tunicamycin-resistant cells of Bacillus subtilis.
MOLECULAR & GENERAL GENETICS : MGG 1986;
204:36-43. [PMID:
3018444 DOI:
10.1007/bf00330184]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In a class of tunicamycin-resistant mutants (tmrA7) of Bacillus subtilis, the production of extracellular alpha-amylase is increased by about five fold. The tmrA7 characteristics (tunicamycin resistance and hyperproduction of extracellular alpha-amylase) can be transferred to recipient cells by transformation. In the transformants and the original tmrA7 mutant, typical amplification of the region from 4 kb upstream of the amyE gene to the tmrB gene on the chromosome was detected. The repeating unit, 16 kb in size, repeats tandemly about five and ten times in the mutant and transformants, respectively, and the alpha-amylase production is proportional to the copy number of the amyE gene. Simultaneous amplification of the tmrB gene, which is responsible for tunicamycin resistance in the multicopy state, and the alpha-amylase structural gene (amyE) seems to be the cause of the pleiotropy of the tmrA7 mutation.
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