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Differential susceptibility of Plasmodium falciparum versus yeast and mammalian enolases to dissociation into active monomers.

Abstract
In the past, several unsuccessful attempts have been made to dissociate homodimeric enolases into their active monomeric forms. The main objective of these studies had been to understand whether intersubunit interactions are essential for the catalytic and structural stability of enolases. Further motivation to investigate the properties of monomeric enolase has arisen from several recent reports on the involvement of enolase in diverse nonglycolytic (moonlighting) functions, where it may occur in monomeric form. Here, we report successful dissociation of dimeric enolases from Plasmodium falciparum, yeast and rabbit muscle into active and isolatable monomers. Dimeric enolases could be dissociated into monomers by high concentrations ( approximately 250 mm) of imidazole and/or hydrogen ions. Two forms were separated using Superdex-75 gel filtration chromatography. A detailed comparison of the kinetic and structural properties of monomeric and dimeric forms of recombinant P. falciparum enolase showed differences in specific activity, salt-induced inhibition and inactivation, thermal stability, etc. Furthermore, we found that enolases from the three species differ in their dimer dissociation profiles. Specifically, on challenge with imidazole, Mg(II) protected the enolases of yeast and rabbit muscle but not of P. falciparum from dissociation. The observed differential stability of the P. falciparum enolase dimer interface with respect to mammalian enolases could be exploited to selectively dissociate the dimeric parasite enzyme into its catalytically inefficient, thermally unstable monomeric form. Thus enolase could be a novel therapeutic target for malaria.
AuthorsIpsita Pal-Bhowmick, Sadagopan Krishnan, Gotam K Jarori
JournalThe FEBS journal (FEBS J) Vol. 274 Issue 8 Pg. 1932-45 (Apr 2007) ISSN: 1742-464X [Print] England
PMID17371507 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Imidazoles
  • imidazole
  • Phosphopyruvate Hydratase
Topics
  • Animals
  • Circular Dichroism
  • Dimerization
  • Imidazoles (pharmacology)
  • Kinetics
  • Phosphopyruvate Hydratase (chemistry, metabolism)
  • Plasmodium falciparum (enzymology)
  • Protein Conformation
  • Rabbits
  • Saccharomyces cerevisiae (enzymology)
  • Species Specificity
  • Spectrometry, Fluorescence

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