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Structural requirements for DNA binding of GCM proteins
J Schreiber1, J Enderich, M Wegner
1Zentrum für Molekulare Neurobiologie, Universität Hamburg, Martinistrasse 52, D-20246 Hamburg, Germany.
Nucleic Acids Research
|June 10, 1998
Summary
GCM transcription factors bind DNA using a unique domain. Key DNA positions and specific G-residue methylation affect binding, suggesting redox regulation in GCM protein function.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- GCM transcription factors possess a unique DNA-binding domain.
- Their DNA-binding motif is not recognized by other known transcription factors.
Purpose of the Study:
- To elucidate the critical DNA sequence elements for GCM protein binding.
- To investigate the impact of DNA methylation on GCM binding.
- To identify essential amino acids within the GCM DNA-binding domain.
Main Methods:
- Alanine scan mutagenesis of the mGCMa DNA-binding domain.
- Analysis of DNA sequence importance for GCM binding.
- Investigation of DNA methylation effects on GCM binding.
Main Results:
- Positions 2, 3, 6, and 7 of the 5'-ATGCGGGT-3' motif are crucial for DNA binding.
- Methylation of specific G residues on the upper DNA strand inhibits GCM binding.
- Amino acids K74, C76, and C125 are essential for mGCMa DNA binding.
- Conserved cysteines are vital for DNA-binding domain integrity and redox sensitivity, independent of zinc ions.
Conclusions:
- GCM DNA-binding specificity is determined by precise motif interactions.
- Redox regulation plays a role in GCM protein function.
- The findings provide insights into GCM binding sites in target genes.