Membrane-bounded nucleoid in the eubacterium Gemmatata obscuriglobus.
收藏PubMed Central1991-09-15 更新2026-05-16 收录
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https://pmc.ncbi.nlm.nih.gov/articles/PMC52471/
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资源简介：
The freshwater budding eubacterium Gemmata obscuriglobus possesses a DNA-containing nuclear region that is bounded by two nuclear membranes. The membrane-bounded nature of the nucleoid in this bacterium was shown by thin sectioning of chemically fixed cells, thin sectioning of freeze-substituted cells, and freeze-fracture/freeze-etch. The fibrillar nucleoid was surrounded by electron-dense granules that were in turn enveloped by two nuclear membranes separated by an electron-transparent space. Immunogold labeling of thin sections of conventionally fixed cells with anti-double-stranded DNA antibody demonstrated double-stranded DNA associated with fibrillar material within the membrane boundary. The occurrence of a membrane-bounded nucleoid in a eubacterial prokaryote is a significant exception to the evidence supporting the prokaryote/eukaryote dichotomous classification of cell structure. IMAGES:
提供机构：
National Academy of Sciences
创建时间：
1991-09-15
