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A novel DNA-binding motif in the nuclear matrix attachment DNA-binding protein SATB1
K Nakagomi1, Y Kohwi, L A Dickinson
1La Jolla Cancer Research Foundation, California 92037.
Molecular and Cellular Biology
|March 1, 1994
Summary
Researchers identified a novel DNA binding motif in the SATB1 protein, crucial for its function in binding specific DNA sequences. This motif requires specific terminal sequences for DNA binding activity, highlighting a unique mechanism for gene regulation.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- SATB1 is a nuclear matrix attachment region (MAR) binding protein involved in DNA binding.
- SATB1 recognizes specific AT-rich sequences (ATC sequences) within MARs.
- The conservation and DNA binding domain of SATB1 were not fully characterized.
Purpose of the Study:
- To determine the conservation of the SATB1 gene across species.
- To characterize the DNA binding domain of SATB1.
- To identify the DNA binding motif and its requirements.
Main Methods:
- Cloned mouse SATB1 cDNA from a mouse thymus library.
- Expressed and analyzed a 150-amino-acid polypeptide for DNA binding activity.
- Performed deletion analyses on the DNA binding domain.
Main Results:
- Identified a mouse SATB1 homolog with 98% amino acid homology to human SATB1.
- Delineated a 150-amino-acid DNA binding domain that confers full binding activity.
- Discovered a novel DNA binding motif requiring specific N- and C-terminal sequences for activity.
Conclusions:
- The DNA binding domain of SATB1 possesses a unique motif essential for sequence-specific DNA binding.
- The binding activity is dependent on the presence of both terminal sequences within the binding domain.
- SATB1 likely utilizes these terminal regions to make direct contact with DNA.