期刊
MOLECULAR AND BIOCHEMICAL PARASITOLOGY
卷 156, 期 2, 页码 210-216出版社
ELSEVIER
DOI: 10.1016/j.molbiopara.2007.08.002
关键词
Onchocerca volvulus; Brugia malayi; Caenorhabditis elegans; glycolysis; gluconeogenesis; phosphoglycerate mutase
资金
- NIAID NIH HHS [AI061865] Funding Source: Medline
Phosphoglycerate mutase (PGM, EC 5.4.2.1) catalyzes the isomerization of 3-phosphoglycerate and 2-phosphoglycerate in glycolysis and gluconeogenesis. Two distinct types of PGM exist in nature, one that requires 2,3-bisphosphoglycerate as a cofactor (dPGM) and another that does not (iPGM). The two enzymes are structurally distinct and possess different mechanisms of action. In any particular organism, one form may exist or both. Nematodes possess the iPGM form whereas mammals have dPGM. In the present study, we have cloned and expressed iPGM from Onchocerca volvulus and described the catalytic properties of O. volvulus, Brugia malayi and Caenorhabditis elegans iPGM enzymes. Temperature and pH optima were determined for each enzyme. Like other iPGM enzymes, the activities of the nematode iPGM enzymes were dependent on the presence of divalent ions. Inactivation by EDTA could be restored most effectively by magnesium and manganese ions. Kinetic parameters and specific activities of the various recombinant enzymes were determined. The high similarity in catalytic properties among the enzymes indicates that a single enzyme inhibitor would likely be effective against all nematode enzymes. Inhibition of iPGM activity in vivo may lead to lethality as indicated by RNAi studies in C elegans. Our results support the development of iPGM as a promising drug target in parasitic nematodes. (c) 2007 Elsevier B.V. All rights reserved.
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