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In our previous study, we showed that cell fusion occurred in spheroplasts of Deinococcus grandis at 200 mM calcium chloride in the incubation medium. Extra-huge cells (&amp;gt; 0.1 mm in diameter) were observed at this concentration with a low frequency of appearance. In this study, we showed that cell fusion occurred consecutively in D. grandis spheroplasts following an incubation for spheroplast enlargement using medium containing 16.2 mM calcium chloride and 333 mM sucrose. As a result, more extra-huge cells were generated, where cells had maximum diameter of &amp;gt; 1 mm. They can be observed with naked eyes in the incubation medium. The giant cells contained multiple cytoplasms covered by the plasma membrane, indicating that the cell fusion occurred only among the outer membranes. Thus, only the outer membrane and the periplasmic space are shared but not the cytoplasm, indicating that genome of each cell remains in its cytoplasm. Our findings indicate that sugar enhances outer membrane fusion in D. grandis spheroplasts to generate calcium ion-dependent extra-huge cells.

Sugar enhances outer membrane fusion in Deinococcus grandis spheroplasts to generate calcium ion-dependent extra-huge cells