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<p>The representatives of the archamoebian genus <i>Pelomyxa</i> are amoeboid anaerobic protists that inhabit fresh-water anoxic sediments, and most of them are usually multinucleate. The cytoplasm of these unicellular organisms is highly complicated and contains numerous vacuoles of different types, as well as a wide range of prokaryotic endocytobionts, agglomerations of glycogen, lipids, etc. Among the great variety of cytoplasmic structures in <i>P.&#xa0;belevskii</i>, we identified novel organelles termed Cytoplasmic Nucleolin-Rich Bodies (CNRBs) due to their enrichment in nucleolin, a nuclear/nucleolar protein. The <i>P. belevskii&#xa0;</i>CNRBs differ significantly from known cytoplasmic nucleolin-related organelles encountered in some other eukaryotic cells, but their biological significance remains elusive. The work also provides the first description of the nuclear organization of <i>P. belevskii</i>. The nucleolar apparatus of <i>P.</i> <i>belevskii</i> contains little nucleolin, as determined by quantitative electron microscopic data, suggesting that it is inactive despite its morphological complexity. The presence of CNRBs&#xa0;in <i>Pelomyxa</i> is discussed in the context of the specific habitat conditions and biology of these unicellular eukaryotes.</p>

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New nucleolin-containing cytoplasmic bodies in an archamoebian protist Pelomyxa belevskii (Amoebozoa, Archamoebae, Pelobiontida)

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Dmitry S. Bogolyubov,
  • Ludmila V. Chistyakova,
  • Alexandra O. Travina,
  • Maksim I. Sulatsky,
  • Andrew V. Goodkov

摘要

The representatives of the archamoebian genus Pelomyxa are amoeboid anaerobic protists that inhabit fresh-water anoxic sediments, and most of them are usually multinucleate. The cytoplasm of these unicellular organisms is highly complicated and contains numerous vacuoles of different types, as well as a wide range of prokaryotic endocytobionts, agglomerations of glycogen, lipids, etc. Among the great variety of cytoplasmic structures in P. belevskii, we identified novel organelles termed Cytoplasmic Nucleolin-Rich Bodies (CNRBs) due to their enrichment in nucleolin, a nuclear/nucleolar protein. The P. belevskii CNRBs differ significantly from known cytoplasmic nucleolin-related organelles encountered in some other eukaryotic cells, but their biological significance remains elusive. The work also provides the first description of the nuclear organization of P. belevskii. The nucleolar apparatus of P. belevskii contains little nucleolin, as determined by quantitative electron microscopic data, suggesting that it is inactive despite its morphological complexity. The presence of CNRBs in Pelomyxa is discussed in the context of the specific habitat conditions and biology of these unicellular eukaryotes.