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Biotechnology Letters

, Volume 23, Issue 11, pp 917–921 | Cite as

Over-production of lactate dehydrogenase from Plasmodium falciparum opens a route to new antimalarials

  • Dilek Turgut-Balik
  • Debbie K. Shoemark
  • Kathleen M. Moreton
  • Richard B. Sessions
  • J. John Holbrook
Article

Abstract

Over-production of lactate dehydrogenase (PfLDH) from Plasmodium falciparum from E. coli TG2 cells transformed with a pKK223-3 plasmid containing the wild type gene isolated by Bzik DJ, Fox BA, and Gonyer K (1993) Mol. Biochem. Parasit.59, 155–166, gave mostly an inactive protein after isolation. Sequencing the N-terminus of the over-produced protein showed that the major product commenced at an internal methionine. Truncation of the protein occurred due to the inappropriate priming from a Shine–Dalgarno (SD) sequence upstream of Met 35. Silent mutations of this SD sequence to remove the purine-rich region allowed over-production of the full length PfLDH up to 15 mg protein l−1 broth. The purified protein exhibited biochemical properties of an authentic LDH enzyme. However, high activity with 3-acetylpyridine adenine dinucleotide as well as with the natural cofactor, NAD, was also observed. The high-resolution X-ray structure obtained from the recombinant enzyme has provided the opportunity for the development of inhibitors specific to PfLDH.

APAD lactate dehydrogenase malaria Plasmodium falciparum Shine–Dalgarno 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Dilek Turgut-Balik
    • 1
  • Debbie K. Shoemark
    • 2
  • Kathleen M. Moreton
    • 2
  • Richard B. Sessions
    • 2
  • J. John Holbrook
    • 2
  1. 1.Faculty of Science and Arts, Department of BiologyUniversity of FıratElazıgTurkey
  2. 2.Molecular Recognition Centre and Department of BiochemistryUniversity of Bristol School of Medical SciencesBristolUK

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