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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1982 Jan;149(1):346–353. doi: 10.1128/jb.149.1.346-353.1982

Spontaneous protoplast formation in Methanobacterium bryantii.

K F Jarrell, J R Colvin, G D Sprott
PMCID: PMC216628  PMID: 7054145

Abstract

Methanobacterium bryantii was found to undergo rapid lysis when grown in a prereduced chemically defined medium under H2-CO2 (4:1, vol/vol). The addition of 20 mM MgCl2 to the medium gave, rather than rapid lysis, a gradual formation of phase-dark spherical bodies which in thin section appeared as true protoplasts. In general, the protoplasts were stabilized by divalent but not monovalent cations and, unlike whole cells, were sensitive to lysis by Triton X-100. Electron microscopic examination revealed that protoplast formation was preceded by a general breakdown of the cell wall with an apparent squeezing out of the protoplast through the degraded wall. The growth of cells was greatly increased and not accompanied by detectable lysis in a medium modified by elevating the levels of nickel and ammonium.

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Selected References

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