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Protein expression during the excystment of Colpoda cucullus was studied by SDS-PAGE. The expression levels of 60-, 50- and 49-kDa proteins were markedly changed from the early to later stage of excystment. The 60-kDa protein (p60) was temporarily expressed first, and its expression was inhibited by actinomycin D. LC-MS/MS analysis showed that the amino acid sequences of p60 partially coincided with those of the Paramecium tetraurelia unnamed protein homologous to DEAD-box RNA helicase. These results suggest that p60 expression is enhanced by transcriptional regulation and may be involved in initiating the molecular events leading to cellular morphogenesis.

Excystment-Dependent Alteration of Protein Expression in Terrestrial Ciliate <i>Colpoda cucullus</i>