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Immunoelectron microscope visualization of nuclear ribonucleoprotein antigens within spread transcription complexes
The Journal of Cell Biology
|October 1, 1986
Summary
This study maps nuclear ribonucleoproteins (RNP) in active chromatin. It shows heterogeneous nuclear (hn)RNP and small nuclear (sn)RNP proteins associate with nascent RNA during transcription.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Nuclear ribonucleoproteins (RNP) are crucial for gene expression.
- Understanding RNP localization during transcription is key to gene regulation.
Purpose of the Study:
- To investigate the ultrastructural distribution of nuclear RNP within active chromatin.
- To determine the association of hnRNP and snRNP with nascent RNA.
Main Methods:
- Used monoclonal antibodies against hnRNP and snRNP core proteins.
- Applied protein A-colloidal gold complex for visualization.
- Examined lysed mouse and Drosophila tissue culture cells.
Main Results:
- hnRNP core proteins localized on growing RNP fibrils in transcription complexes.
- snRNP antigens associated with nascent RNA during transcription elongation.
- Confirmed core hnRNP proteins on nascent RNA transcripts.
Conclusions:
- Provided direct evidence for U-snRNP association with extranucleolar RNA during transcription.
- Demonstrated the presence of core hnRNP proteins on nascent RNA.