Adaptation of <Emphasis Type="Italic">Mycoplasma gallisepticum</Emphasis> to unfavorable growth conditions: Changes in morphological and physiological characteristics |
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| Authors: | V M Chernov O A Chernova O V Gorshkov A A Muzykantov G F Shaimardanova A D Pel’nikevich A B Margulis A I Kolpakov O N Il’inskaya |
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| Institution: | (1) Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, ul. Lobachevskogo, 2/31, Kazan, Tatarstan, 420111, Russia;(2) Kazan State University, Kazan, Russia |
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| Abstract: | Adaptation of Mycoplasma gallisepticum to unfavorable growth conditions results in altered morphological and physiological characteristics of the cells. M. gallisepticum populations in a complete nutrient medium contain pear-shaped vegetative cells ( d ～ 0.3 μm; l ～ 0.8 μm) with pronounced polar and cytoskeletonlike structures. Such mycoplasma cells are able to induce damage in a bacterial genome, causing an SOS response of the test strain (Escherichia coli PQ37). In a starvation medium, M. gallisepticum produces nanoforms, small coccoid cells (d ～ 0.15–0.2 μm) without either polar or cytoskeleton-like structures. Unlike vegetative cells, nanoforms do not induce genome damage. Alleviation of unfavorable growth conditions results in a reversion of nanoforms to vegetative cells. |
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| Keywords: | mycoplasmas adaptation cell ultrastructure nanoforms SOS response |
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