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Metal binding and DNA recognition in transcription factor Sp1
J Kuwahara1, M Futamura, N Sogo
1Institute for Chemical Research, Kyoto University, Japan.
Nucleic Acids Symposium Series
|January 1, 1991
Summary
The Sp1 DNA binding domain requires zinc for proper folding and DNA interaction. Even with reduced zinc, Sp1 retains some DNA binding ability, suggesting a robust interaction.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- The Sp1 transcription factor plays a crucial role in gene regulation.
- Sp1 contains a DNA-binding domain with three Cys2His2-type zinc-finger motifs.
Purpose of the Study:
- To investigate the role of zinc in the folding and DNA binding of the Sp1 DNA-binding domain.
- To characterize the metal-dependent properties of the Sp1 zinc-finger motifs.
Main Methods:
- Cloning and expression of the Sp1 DNA-binding domain in E. coli.
- Assessing metal-dependent folding and DNA binding activity of the Sp1 fragment.
Main Results:
- The Sp1 fragment demonstrated metal-dependent folding, indicating zinc's essential role.
- DNA binding activity was observed to be dependent on the presence of metal ions.
- Zinc(II)-induced folding of the three zinc-finger motifs appears to be a cooperative process.
Conclusions:
- Zinc is critical for the proper structure and function of the Sp1 DNA-binding domain.
- Partial loss of zinc significantly reduces but does not eliminate Sp1's DNA binding capacity.