The p53 C terminus controls site-specific DNA binding and promotes structural changes within the central DNA binding...

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Transcription factors, like p53, bind DNA to regulate gene expression.
• The p53 core DNA binding domain (DBD) is known for site-specific binding.
• The role of the p53 C-terminal domain (CTD) in DNA binding remains unclear.

Purpose of the Study:

• To investigate the DNA-binding properties of p53 C-terminal domain (CTD) variants.
• To elucidate the contribution of the CTD to p53-DNA interactions.
• To understand how CTD modifications or deletions affect DNA binding.

Main Methods:

• In vitro biochemical analyses of p53 CTD variants.
• In vivo DNA binding experiments.
• Analysis of p53 binding to canonical and divergent DNA sequences.

Main Results:

• The p53 CTD mediates sequence-dependent DNA binding, sensitive to modifications or deletions.
• CTD dependence increases as p53 binding sites deviate from consensus sequences.
• The CTD facilitates stable p53-DNA complex formation at divergent sites through DBD conformational changes.

Conclusions:

• The p53 CTD plays a significant, sequence-dependent role in DNA binding.
• CTD function is critical for p53 to bind non-canonical DNA sites.
• DNA-induced conformational changes in the DBD, mediated by the CTD, are key for stable binding.