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Nuclear S1 proteins from the starfish Asterina pectinifera
T Emura1, S Fujimoto, K P Takahashi
1Department of Biochemistry, Osaka City University Medical School, Japan.
Biochemistry International
|March 1, 1992
Summary
Researchers identified two nuclear S1 proteins in starfish, suggesting these proteins, originally found in vertebrates, are widespread in eukaryotes and play a fundamental role in the cell nucleus.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Nuclear S1 proteins are a conserved group of proteins found in vertebrate cell nuclei.
- These proteins were initially isolated from rat liver nuclei after DNase I digestion.
Purpose of the Study:
- To investigate the presence and characteristics of S1 proteins in non-vertebrate eukaryotes.
- To determine if S1 proteins are conserved across different eukaryotic lineages.
Main Methods:
- Proteins were isolated from starfish (Asterina Pectinifera) nuclei under conditions similar to those used for vertebrate cells.
- Molecular weights of the identified proteins were determined.
Main Results:
- Two distinct S1 proteins were identified in the starfish Asterina Pectinifera.
- The molecular weights of these starfish S1 proteins were determined to be 47,200 and 39,000 Da.
Conclusions:
- The identification of S1 proteins in starfish suggests their widespread occurrence in eukaryotes.
- These findings support a fundamental role for S1 proteins in the function of the cell nucleus across diverse eukaryotic organisms.