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Ultramicrobacteria: Formation of the concept and contribution of ultramicrobacteria to biology

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Ultramicrobacteria (UMB) are species of the domain Bacteria characterized by very small sizes of proliferating cells (less than 0.1 μm3 in volume) and small genomes (3.2 to 0.58 Mb). Some authors use the term nanobacteria as a synonym of UMB. Several tens of UMB species have been isolated from various natural habitats: sea water, soil, silt, Greenland ice sheet, permafrost soils, and intestines of humans and insects. Under laboratory conditions, they are cultivated on different nutrient media. In the second prokaryotic domain, the Archaea, ultrasmall forms (ultramicroarchaea) have also been described, including nanoarchaea (members of the genus Nanoarchaeum) with a cell volume of less than 0.1 μm3. The term nanobacteria is used in the literature also to denote ultrasmall bacterium-like particles occurring in rocks, sands, soils, deep sub-surface layers, meteorites, and clinical samples. The systematic position and the capacity for self-reproduction of these particles are still unclear. The cultured UMB forms are characterized by highly diverse morphology, ultrastructural organization, physiology, biochemistry, and ecology. UMB form three groups according to the type of cell wall structure and the reaction to Gram staining: (1) gram-negative, (2) gram-positive, and (3) cell wall-lacking. Their cells divide by constriction, septation, or budding. The unique processes performed by UMB are dehalorespiration and obligate or facultative epibiotic parasitism. The UMB that synthesize organic compounds in ocean waters with the involvement of proteorhodopsin play a great role in the biosphere. UMB have been found in seven large phylogenetic groups of prokaryotes, where their closest relatives are organisms with larger cells typical of bacteria, which is evidence of the polyphyletic origin of the currently known UMB species and the reductive mode of their evolution.

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Authors and Affiliations

  1. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, pr. Nauki 5, Pushchino, Moscow oblast, 142290, Russia

    V. I. Duda, N. E. Suzina, V. N. Polivtseva & A. M. Boronin

  2. Pushchino State Natural Science Institute, pr. Nauki 3, Pushchino, Moscow oblast, 142290, Russia

    V. I. Duda, V. N. Polivtseva & A. M. Boronin

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  1. V. I. Duda
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  2. N. E. Suzina
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  3. V. N. Polivtseva
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  4. A. M. Boronin
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Original Russian Text © V.I. Duda, N.E. Suzina, V.N. Polivtseva, A.M. Boronin, 2012, published in Mikrobiologiya, 2012, Vol. 81, No. 4, pp. 415–427.

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Duda, V.I., Suzina, N.E., Polivtseva, V.N. et al. Ultramicrobacteria: Formation of the concept and contribution of ultramicrobacteria to biology. Microbiology 81, 379–390 (2012). https://doi.org/10.1134/S0026261712040054

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