Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 366, Issue 3, Pages 821-826Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2007.12.025
Keywords
monofunctional enzyme; dihydroorotase; pyrimidine; Plasmodium falciparum; malaria
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Plasmodium falciparum, the causative agent of human malaria, is totally dependent on de novo pyrimidine biosynthetic pathway. A gene encoding P. falciparum dihydroorotase (pfDHOase) was cloned and expressed in Escherichia coli as monofunctional enzyme. PfDHOase revealed a molecular mass of 42 kDa. In gel filtration chromatography, the major enzyme activity eluted at 40 kDa, indicating that it functions in a monomeric form. This was similarly observed using the native enzyme purified from P. falciparum. Interestingly, kinetic parameters of the enzyme and inhibitory effect by orotate and its 5-substituted derivatives parallel that found in mammalian type I DHOase. Thus, the malarial enzyme shares characteristics of both type I and type II DHOases. This study provides the monofunctional property of the parasite DHOase lending further insights into its differences from the human enzyme which forms part of a multifunctional protein. (c) 2007 Elsevier Inc. All rights reserved.
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