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Two hypervariable minisatellite DNA binding proteins.
Nucleic Acids Research
|June 25, 1991
Summary
Researchers identified two novel proteins, Msbp-2 and Msbp-3, that bind to hypervariable minisatellite DNA sequences. These proteins may play a role in initiating DNA recombination in human cells.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Hypervariable minisatellite DNA sequences are repetitive DNA elements found in eukaryotes.
- These sequences are known to stimulate intermolecular homologous recombination in human cells.
- They are implicated as potential initiation sites for genomic recombination.
Purpose of the Study:
- To detect and partially purify proteins that bind to hypervariable minisatellite DNA.
- To investigate the role of these binding proteins in DNA recombination.
Main Methods:
- Nuclear extracts from human HeLa cells were prepared.
- Gel filtration chromatography was used for protein purification and mass determination.
- Detection of DNA-binding proteins was performed.
Main Results:
- Two distinct hypervariable minisatellite DNA binding proteins, Msbp-2 and Msbp-3, were identified.
- Msbp-2 has a subunit size of 77 kDa, and Msbp-3 has a subunit size of 115 kDa.
- Both proteins eluted from a gel filtration column with a native mass of 200-250 kDa.
Conclusions:
- Msbp-2 and Msbp-3 are novel proteins that bind to hypervariable minisatellite DNA.
- These proteins may be involved in the regulation of DNA recombination initiation.