PMID: 10498720Sep 28, 1999Paper

Partitioning, movement, and positioning of nucleoids in Mycoplasma capricolum

Journal of Bacteriology
S Seto, M Miyata


The nucleoids in Mycoplasma capricolum cells were visualized by phase-combined fluorescence microscopy of DAPI (4', 6-diamidino-2-phenylindole)-stained cells. Most growing cells in a rich medium had one or two nucleoids in a cell, and no anucleate cells were found. The nucleoids were positioned in the center in mononucleoid cells and at one-quarter and three-quarters of the cell length in binucleoid cells. These formations may have the purpose of ensuring delivery of replicated DNA to daughter cells. Internucleoid distances in binucleoid cells correlated with the cell lengths, and the relationship of DNA content to cell length showed that cell length depended on DNA content in binucleoid cells but not in mononucleoid cells. These observations suggest that cell elongation takes place in combination with nucleoid movement. Lipid synthesis was inhibited by transfer of cells to a medium lacking supplementation for lipid synthesis. The transferred cells immediately stopped dividing and elongated while regular spaces were maintained between the nucleoids for 1 h. After 1 h, the cells changed their shapes from rod-like to round, but the proportion of multinucleoid cells increased. Inhibition of protein synthesis by chloramphenicol ind...Continue Reading


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