The gene encoding topoisomerase II from Plasmodium falciparum

Area of Science:

• Molecular biology
• Parasitology
• Genetics

Background:

• Topoisomerase II is crucial for DNA replication and repair.
• Understanding Plasmodium falciparum's unique genetic machinery is key to developing antimalarials.

Purpose of the Study:

• To isolate and characterize the gene encoding topoisomerase II in Plasmodium falciparum.
• To investigate the structural and functional properties of PfTopoisomerase II.

Main Methods:

• Genomic library screening
• DNA sequencing
• Northern blot analysis
• Western blot analysis
• Immunofluorescence microscopy

Main Results:

• The Plasmodium falciparum topoisomerase II gene (PfTopoisomerase II) has an open reading frame of 4194 nucleotides, predicting a 1398-amino acid polypeptide without introns.
• PfTopoisomerase II shares 47.4% identity and 65.4% similarity with its human homologue, containing conserved sequences and unique asparagine-rich insertions.
• The gene is located on chromosome 14, with a transcript size of 5.8 kb. The protein, approximately 160 kDa, is detected at all intraerythrocytic stages.

Conclusions:

• The PfTopoisomerase II gene has been successfully isolated and characterized.
• Unique structural features of PfTopoisomerase II may offer targets for antimalarial drug development.
• The protein's presence throughout the intraerythrocytic cycle highlights its essential role in parasite survival.