A versatile inducible plant model system for dissecting p53 function and discovering novel interaction networks

Area of Science:

• Molecular Biology
• Plant Science
• Cancer Research

Background:

• The p53 (protein 53) protein is a crucial tumor suppressor in animals, regulating cell cycle arrest, DNA repair, and apoptosis.
• Over half of human cancers harbor p53 mutations, highlighting its significance in cancer research.

Purpose of the Study:

• To develop a novel system for studying p53 function using the plant *Arabidopsis thaliana*.
• To investigate the molecular and cellular responses to p53 expression in a plant system.

Main Methods:

• Engineered *Arabidopsis thaliana* to express p53 under an inducible promoter for controlled activity.
• Analyzed molecular traits, subcellular localization, and cellular responses (cell-cycle arrest, cell death) to p53 overexpression.
• Investigated the effect of copper ions on p53 activity.

Main Results:

• Plant-produced p53 exhibited molecular characteristics and subcellular localization similar to mammalian p53.
• Overexpression of p53 induced cell-cycle arrest and a programmed cell death-like response in plants.
• Copper ions were found to suppress p53 activity in this plant model.

Conclusions:

• The engineered *Arabidopsis* system provides a valuable tool for p53 research, including cancer studies.
• This system allows for the investigation of p53's role in cell death regulation and tissue regeneration using plant-specific promoters.