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Characterization of a Corynebacterium glutamicum dnaB mutant that shows temperature-sensitive growth and mini-cell formation

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Abstract

Corynebacterium glutamicum is known to perform a unique form of cell division called post-fission snapping division. In order to investigate the mechanism of cell division of this bacterium, we isolated temperature-sensitive mutants from C. glutamicum wild-type strain ATCC 31831, and found that one of them, M45, produced high frequencies of mini-cells with no nucleoids. Cell pairs composed of an elongated cell, with one nucleoid, connected to a mini-cell, with no nucleoids, were occasionally observed. The temperature sensitivity and mini-cell formation of M45 was complemented by a 2-kb DraI-EcoRI fragment derived from the ATCC 31831 chromosomal DNA, which carried a dnaB homolog encoding a replicative DNA helicase. DNA sequence analysis revealed that M45 carried a missense mutation in the dnaB gene, which caused a substitution of Thr364 to Ile. Microscopic observation after 4ʹ,6-diamidino-2-phenylindole staining revealed that the DNA content of single cells was decreased by culturing at the restrictive temperature, suggesting that the mutation affects chromosomal replication. These results suggest that the C. glutamicum dnaB mutant performs an asymmetric cell division even after DNA replication is inhibited, which results in the production of mini-cells.

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  1. Department of Bioengineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8501, Japan

    Makoto Uchida, Takashi Hirasawa & Masaaki Wachi

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  1. Makoto Uchida
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  2. Takashi Hirasawa
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  3. Masaaki Wachi
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Correspondence to Masaaki Wachi.

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Communicated by Erko Stackebrandt.

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Uchida, M., Hirasawa, T. & Wachi, M. Characterization of a Corynebacterium glutamicum dnaB mutant that shows temperature-sensitive growth and mini-cell formation. Arch Microbiol 196, 871–879 (2014). https://doi.org/10.1007/s00203-014-1026-7

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