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Isolation, characterization and microsequence analysis of a small basic methylated DNA-binding protein from the
T Choli1, P Henning, B Wittmann-Liebold
1Abteilung Wittmann, Max-Planck-Institut für Molekulare Genetik, Berlin, Germany.
Biochimica Et Biophysica Acta
|July 13, 1988
Summary
Researchers identified a novel DNA-binding protein, Sso7d, from the extremophile Sulfolobus solfataricus. This histone-like protein, purified and sequenced, exhibits strong DNA-binding affinity and unique methylation patterns.
Area of Science:
- Extremophile biology
- Archaea biochemistry
- Molecular genetics
Background:
- Thermoacidophilic archaea, such as Sulfolobus solfataricus, possess unique DNA-binding proteins.
- These proteins may play a role similar to histones in organizing DNA.
Purpose of the Study:
- To isolate and characterize DNA-binding proteins from Sulfolobus solfataricus.
- To determine the DNA-binding properties and sequence of a prominent 7 kDa protein.
Main Methods:
- Protein extraction and purification under non-denaturing conditions.
- DNA-binding assays (filter binding) and electron microscopy.
- Amino acid sequencing and homology analysis.
Main Results:
- Three molecular mass classes of DNA-binding proteins (7, 8, 10 kDa) were identified.
- The main 7 kDa protein, named Sso7d, was purified and confirmed as a monomer.
- Sso7d (63 amino acids, Mr 7149) showed homology to Sulfolobus acidocaldarius 7 kDa proteins, with specific lysine methylation.
Conclusions:
- Sso7d is a novel DNA-binding protein from Sulfolobus solfataricus with histone-like potential.
- Its unique methylation pattern and strong DNA-binding affinity are key characteristics.
- Sso7d represents a significant finding in the study of archaeal DNA organization.