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An evolutionarily conserved protein fraction stably linked to DNA
Z Avramova1, I Mikhailov, R Tsanev
1Institute of Molecular Biology, Bulgarian Academy of Sciences, Sofia.
Biochimica Et Biophysica Acta
|January 23, 1989
Summary
A conserved nuclear protein tightly bound to DNA was identified across diverse species, from insects to birds. This finding suggests a fundamental, indispensable role for this protein in cellular function.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Biochemistry
Background:
- Chromatin, the complex of DNA and proteins, is fundamental to eukaryotic genome organization.
- Understanding the core components of chromatin is crucial for deciphering nuclear function.
Purpose of the Study:
- To investigate the evolutionary conservation of proteins associated with DNA in chromatin.
- To identify any protein fraction that remains bound to DNA after extensive purification.
Main Methods:
- Isolation of chromatin from evolutionarily diverse species (insect, fish, amphibian, bird).
- High-salt extraction and extensive deproteinization to remove non-covalently bound proteins.
- Two-dimensional tryptic peptide mapping to analyze protein components.
Main Results:
- A specific protein fraction was found to be firmly associated with DNA in all tested species.
- Peptide mapping demonstrated significant evolutionary conservation of this DNA-bound protein.
- This conserved protein resisted extensive purification procedures.
Conclusions:
- A highly conserved, DNA-bound protein component exists within the chromatin of diverse eukaryotic species.
- The evolutionary stability of this protein suggests a critical and indispensable nuclear function.