Characterization of kinetics of DNA strand-exchange and ATP hydrolysis activities of recombinant PfRad51, a Plasmodium falciparum recombinase

Mrinal Kanti Bhattacharyya, Sunanda Bhattacharyya Nee Deb, Bamini Jayabalasingham, Nirbhay Kumar

Research output: Contribution to journalArticlepeer-review

Abstract

Although homologous recombination-mediated DNA rearrangements are quite widespread in Plasmodium falciparum, the molecular mechanisms involved are essentially unknown. Recent identification of PfRad51 in P. falciparum has suggested that it may play central role during homologous recombination and DNA rearrangements. Full-length recombinant PfRad51 was over expressed in Escherichia coli and purified to near homogeneity. Using optimized enzymatic activity conditions recombinant PfRad51 protein was shown to catalyze DNA strand-exchange reaction, a central step during homologous recombination. Unlike bacterial RecA protein, PfRad51 promoted strand-exchange reaction does not require ATP hydrolysis. The PfRad51 protein also catalyzed ssDNA-dependent ATP hydrolysis and the k cat values were similar to those reported for human Rad51. The demonstration of strand-exchange activity of PfRad51 protein, first such report in any protozoan parasite, suggests importance of similar recombination mechanism during DNA rearrangements associated with antigenic variation in P. falciparum.

Original languageEnglish (US)
Pages (from-to)33-39
Number of pages7
JournalMolecular and Biochemical Parasitology
Volume139
Issue number1
DOIs
StatePublished - Jan 1 2005

Keywords

  • ATPase assay
  • Homologous recombination
  • Malaria
  • RecA
  • Three strand-exchange assay

ASJC Scopus subject areas

  • Parasitology
  • Molecular Biology

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