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- W926719914 abstract "Myxococcus xanthus can respond to nutrient limitation in either of two ways: (i) it can enter a stationary phase, in which cells grow very slowly, or (ii) it can stop growth and initiate the development of fruiting bodies with the eventual differentiation of spores. In Escherichia coli and Salmonella typhimurium, stationary phase triggers differentiation into environmentally resistant rod cells, but this resistance is not manifest in M. xanthus despite the presence of a stationary phase and a stationary-phase sigma factor, encoded by sigD. The time-ordered sequence of morphological and biochemical changes is coordinated by several signals passed between cells. One of these signals, A-factor, plays an important role in evaluating and responding to starvation. Purification of A-factor was based on an A-signal-dependent promoter. To identify A-factor, substances that would allow an A-signal-deficient mutant strain to express the Tn5 lacZ transcriptional fusion Ω4521 were sought from wild-type cells. Importantly, (p)ppGpp directly assesses the cell's capacity to synthesize any protein for which it has mRNA. There is as yet no evidence that other starvation-sensing pathways play a role in initiating development, even though the level of cyclic AMP rises twofold after starvation. The (p)ppGpp induces A-factor production, which requires asgA, asgB, and asgC. A-factor, being soluble, creates a pool outside the cells. Each cell then responds to the total amount of A-factor produced by all cells. The choice of response to depletion of nutrients is critical for cell survival." @default.
- W926719914 created "2016-06-24" @default.
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- W926719914 date "2014-04-08" @default.
- W926719914 modified "2023-10-17" @default.
- W926719914 title "Cell-Interactive Sensing of the Environment" @default.
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- W926719914 doi "https://doi.org/10.1128/9781555818166.ch12" @default.
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