期刊
ELIFE
卷 10, 期 -, 页码 -出版社
eLIFE SCIENCES PUBL LTD
DOI: 10.7554/eLife.70106
关键词
cell-size homeostasis; single-cell growth; apical growth; RodA; cell wall; C; glutamicum; Other
类别
资金
- Ludwig-Maximilians-Universita t Munchen
- Deutsche Forschungsgemeinschaft [TRR 174 project P06, TRR 174 project P05]
Research has found that bacteria mostly grow exponentially and require tight regulation to maintain cell size homeostasis. A new inference method revealed that Corynebacterium glutamicum grows asymptotically linearly at the single-cell level, suggesting this growth mode could act as a substitute for tight division length and division symmetry regulation.
Regulation of growth and cell size is crucial for the optimization of bacterial cellular function. So far, single bacterial cells have been found to grow predominantly exponentially, which implies the need for tight regulation to maintain cell size homeostasis. Here, we characterize the growth behavior of the apically growing bacterium Corynebacterium glutamicum using a novel broadly applicable inference method for single-cell growth dynamics. Using this approach, we find that C. glutamicum exhibits asymptotically linear single-cell growth. To explain this growth mode, we model elongation as being rate-limited by the apical growth mechanism. Our model accurately reproduces the inferred cell growth dynamics and is validated with elongation measurements on a transglycosylase deficient Delta rodA mutant. Finally, with simulations we show that the distribution of cell lengths is narrower for linear than exponential growth, suggesting that this asymptotically linear growth mode can act as a substitute for tight division length and division symmetry regulation.
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