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Low-temperature growth of Shewanella oneidensis MR-1.

Applied and Environmental Microbiology

analysis, Bacterial Proteins, Cold Temperature, Lipids, Microscopy, Electron, Transmission, Phenotype, Shewanella, chemistry, growth & development, ultrastructure

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      Shewanella oneidensis MR-1 is a mesophilic bacterium with a maximum growth temperature of approximately 35 degrees C but the ability to grow over a wide range of temperatures, including temperatures near zero. At room temperature ( approximately 22 degrees C) MR-1 grows with a doubling time of about 40 min, but when moved from 22 degrees C to 3 degrees C, MR-1 cells display a very long lag phase of more than 100 h followed by very slow growth, with a doubling time of approximately 67 h. In comparison to cells grown at 22 degrees C, the cold-grown cells formed long, motile filaments, showed many spheroplast-like structures, produced an array of proteins not seen at higher temperature, and synthesized a different pattern of cellular lipids. Frequent pilus-like structures were observed during the transition from 3 to 22 degrees C.

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      added an editorial note to Shewanella

      Ever noticed that Shewanella still grow in the fridge? Ever asked yourself who are these funny wormlike bacteria which appeared in your refridgerated monoculture all of a sudden? Abboud et al. report the phenomenon in detail.

      2016-03-11 16:22 UTC

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