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Ciliated protists are a large group of single-cell eukaryotes, leading to the resting cysts in unfavorable environmental condition. However, the underlying molecular mechanism of encystment in the free-living ciliates is poorly understood. Here we show that the resting cysts are better than the vegetative cells of  Euplotes encysticus  in adverse survivor with respect to energy metabolism. Therefore scale identification of encystment-related proteins in  Euplotes encysticus  was investigated by iTRAQ analysis. We analyzed a total of 130 proteins, in which 19 proteins involving 12 upregulated and 7 downregulated proteins were associated with encystment in the resting cysts in comparison with the vegetative cells. Moreover, direct fluorescent labeling analysis showed that the vegetative cells treated with shRNA-β-tubulin recombinant  E. coli  accumulated a large number of granular materials, and dramatic cell morphology changes. Importantly, the cell membrane rupture phenomenon was observed after three weeks of shRNA-β-tubulin interference as compared to the control group. These results revealed that different proteins might play an important role in the process of the vegetative cells into the resting cysts. These results will help to reveal the morphological changes and molecular mechanism of resting cyst formation of ciliates.

New contribution to the morphology and molecular mechanism of Euplotes encysticus encystment