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Pubmed ID :27573234
Publication Date : //

Morphogenetic and molecular analyses of cyst wall components in the ciliated protozoan Colpoda cucullus Nag-1.


The cyst wall of the resting cyst of the ciliated protozoan Colpoda cucullus (Nag-1 strain) is composed of several layers of endocyst, a single layer of ectocyst associated with a mucous layer and lepidosomes composed of a fibrous or crystal-like structure. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that the ectocyst associated with lepidosomes and mucous materials contained proteins corresponding to 27, 31, 45 kDa and smear bands ranging from 50 to 60 kDa. Liquid chromatography-tandem mass spectrometry of these proteins revealed that the 45-kDa protein (p45) was elongation factor Tu (EF-Tu). Immunofluorescence microscopy with an anti-EF-Tu polyclonal antibody showed that Colpoda EF-Tu (p45) was localized in the lepidosomes. The lepidosomes were stained vividly with Congo red, which is bound to the stacked β-sheets of amyloid protofibrils. In the presence of puromycin, no cyst wall components including lepidosomes were formed, indicating that cyst wall formation requires synthesis of proteins including EF-Tu. Electron microscopy of encysting cells implied that vesicles which were presumably budded from endoplasmic reticula possibly fuse with a lepidosome-precursor vacuole containing electron-dense fine particles or fibrous structures, and followed by the subsequent fusion with other electron-lucent granules.

Authors : Funadani Ryoji , Sogame Yoichiro , Kojima Katsuhiko , Takeshita Toshikazu , Yamamoto Keisuke , Tsujizono Tomoya , Suizu Futoshi , Miyata Seiji , Yagyu Ken-Ichi , Suzuki Tomohiko , Arikawa Mikihiko , Matsuoka Tatsuomi ,

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