Ultrastructure of the membrane system in Lactobacillus plantarum.

Journal of Bacteriology
T KakefudaN M Utech

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, sug...Continue Reading

Citations

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