Related Experiment Videos
A human autoantibody recognizing nuclear matrix-associated nuclear protein localized in dot structures
M Zuber1, T S Heyden, A M Lajous-Petter
1Internal Medicine I, University of Saarland, Homburg-Saar, Germany.
Biology of the Cell
|January 1, 1995
Summary
Researchers identified a novel nuclear protein, NDP53, within dot-like structures in the cell nucleus. This protein is associated with the nuclear matrix and colocalizes with known nuclear body components.
Area of Science:
- Cell Biology
- Molecular Biology
- Immunology
Background:
- Nuclear bodies are dynamic structures within the cell nucleus involved in various cellular processes.
- Characterization of novel nuclear antigens aids in understanding nuclear organization and function.
Purpose of the Study:
- To characterize a protein antigen recognized by a human autoimmune serum.
- To determine the localization, properties, and molecular associations of the novel nuclear protein.
Main Methods:
- Immunofluorescence microscopy on diverse human, mouse, rat, marsupial, and hamster cell lines and tissues.
- Protein biochemical analysis including isoelectric point determination and digestion experiments.
- Immunelectron microscopy and colocalization studies with known nuclear body proteins (Sp100, PML, NDP55).
Main Results:
- A novel 53 kDa protein (NDP53) was identified in dot-like structures in the nucleoplasm, outside nucleoli.
- NDP53 is associated with the nuclear matrix and not directly with DNA or RNA.
- Immunelectron microscopy revealed filamentous structures, and NDP53 colocalizes with Sp100, PML, and NDP55 within ND10 nuclear bodies.
Conclusions:
- NDP53 is a component of nuclear bodies (ND10), a multiprotein complex involved in nuclear organization.
- The characterization of NDP53 provides further insight into the composition and function of ND10 nuclear bodies.