Structure analysis of group I plant nucleases

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Current anticancer drugs targeting nucleic acids often utilize animal or fungal ribonucleases.
• Plant-derived nucleases present a potential alternative with reduced cytotoxic side effects.

Purpose of the Study:

• To produce and characterize tomato bifunctional nuclease 1 (TBN1) as a recombinant protein for potential anticancer applications.
• To investigate the structural properties of TBN1 through crystallization and X-ray diffraction.

Main Methods:

• Recombinant expression of TBN1 in tobacco leaves.
• Enzyme purification and activity assays.
• Protein crystallization under various conditions.
• X-ray fluorescence for elemental analysis (Zn2+ detection).
• X-ray diffraction for crystallographic data collection.

Main Results:

• Successful production of active recombinant TBN1 in tobacco.
• TBN1 demonstrates activity against both single-stranded and double-stranded RNA and DNA.
• The enzyme was successfully crystallized under multiple conditions.
• Confirmation of Zn(2+) ion presence within the enzyme structure.
• Initial crystallographic data were acquired.

Conclusions:

• Recombinant TBN1 is a viable candidate for developing novel anticancer therapeutics with potentially lower toxicity.
• The structural characterization of TBN1 is underway, paving the way for structure-based drug design.