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. 1967 Jan;93(1):472–482. doi: 10.1128/jb.93.1.472-482.1967

Ultrastructure of the Membrane System in Lactobacillus plantarum

Tsuyoshi Kakefuda 1,2, Joseph T Holden 1,2, Nedra M Utech 1,2
PMCID: PMC315020  PMID: 6020418

Abstract

Electron microscopic study of Lactobacillus plantarum revealed mesosomes in different stages of maturation and structural relation with other cell organelles. Small, immature mesosomes were bounded by a prominent electron-dense layer with another extremely faint layer on the outside. This corresponds to the appearance of the cytoplasmic membrane. Large mature mesosomes were surrounded by a triple-layered unit membrane having electron-opaque layers of approximately equal density, suggesting that the composition of the boundary membrane alters during development of this structure. Three-dimensional observations derived from serial sections indicated that mesosomes always maintain a connection between the cytoplasmic membrane and the comparable layers of their boundary. The cytoplasmic membrane also consisted of a triple-layered unit membrane, the innermost layer of which was less electron-opaque and was usually hidden by the relatively dense background of the cytoplasm. The innermost layer of the cytoplasmic membrane was most clearly seen in plasmolyzed cells. Only mature mesosomes made distinct contacts with, or were partially immersed in, the nucleoplasm. The boundary of such mesosomes frequently seemed to be discontinuous, suggesting that the mesosome interior was in direct contact with the nucleoplasm. Mesosomes involved in cross-wall formation at a division plane increased in size and passed through a sequence of positions which led ultimately to an association with the nucleoplasms of the daughter cells. The inner surface of the cell wall was lined by a thin, electron-dense layer whose composition and function are unknown. Under the cultural conditions used, this organism regularly contained a polyphosphate granule.

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Selected References

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