The human malaria parasite Plasmodium falciparum expresses an atypical N-terminally extended pyrophosphokinase with specificity for thiamine
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Marie-Luise Eschbach
Abstract
Vitamin B1 is an essential cofactor for key enzymes such as 2-oxoglutarate dehydrogenase and pyruvate dehydrogenase. Plants, bacteria and fungi, as well as Plasmodium falciparum, are capable of synthesising vitamin B1de novo, whereas mammals have to take up this cofactor from their diet. Thiamine, a B1 vitamer, has to be pyrophosphorylated by thiamine pyrophosphokinase (TPK) to the active form. The human malaria parasite P. falciparum expresses an N-terminally extended pyrophosphokinase throughout the entire erythrocytic life cycle, which was analysed by Northern and Western blotting. The recombinant enzyme shows a specific activity of 27 nmol min-1 mg-1 protein and specificity for thiamine with a Km value of 73 μM, while thiamine monophosphate is not accepted. Mutational analysis of the N-terminal extension of the plasmodial TPK showed that it influences thiamine binding as well as metal dependence, which suggests N-terminal participation in the conformation of the active site. Protein sequences of various plasmodial TPKs were analysed for their phylogeny, which classified the Plasmodium TPKs to a group distinct from the mammalian TPKs. To verify the location of the parasite TPK within the cell, immunofluorescence analyses were performed. Co-staining of PfTPK with a GFP marker visualised its cytosolic localisation.
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©2006 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Janus-faced role of endothelial NO synthase in vascular disease: uncoupling of oxygen reduction from NO synthesis and its pharmacological reversal
- Leucine aminopeptidases: diversity in structure and function
- Endogenous anti-inflammatory substances, inter-α-inhibitor and bikunin
- Mitochondrial morphology and distribution in mammalian cells
- Heterogeneity in the cysteine protease inhibitor clitocypin gene family
- Mutations in the inter-SH2 domain of the regulatory subunit of phosphoinositide 3-kinase: effects on catalytic subunit binding and holoenzyme function
- Evaluation of Bacillus anthracis thymidine kinase as a potential target for the development of antibacterial nucleoside analogs
- The human malaria parasite Plasmodium falciparum expresses an atypical N-terminally extended pyrophosphokinase with specificity for thiamine
- Fes1p acts as a nucleotide exchange factor for the ribosome-associated molecular chaperone Ssb1p
- Detailed analysis of MIA protein by mutagenesis
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- Two secreted cystatins of the soft tick Ornithodoros moubata: differential expression pattern and inhibitory specificity
- Acknowledgment
- Contents Biological Chemistry Volume 387, 2006
- Author Index
- Subject Index
Articles in the same Issue
- Janus-faced role of endothelial NO synthase in vascular disease: uncoupling of oxygen reduction from NO synthesis and its pharmacological reversal
- Leucine aminopeptidases: diversity in structure and function
- Endogenous anti-inflammatory substances, inter-α-inhibitor and bikunin
- Mitochondrial morphology and distribution in mammalian cells
- Heterogeneity in the cysteine protease inhibitor clitocypin gene family
- Mutations in the inter-SH2 domain of the regulatory subunit of phosphoinositide 3-kinase: effects on catalytic subunit binding and holoenzyme function
- Evaluation of Bacillus anthracis thymidine kinase as a potential target for the development of antibacterial nucleoside analogs
- The human malaria parasite Plasmodium falciparum expresses an atypical N-terminally extended pyrophosphokinase with specificity for thiamine
- Fes1p acts as a nucleotide exchange factor for the ribosome-associated molecular chaperone Ssb1p
- Detailed analysis of MIA protein by mutagenesis
- The role of human tissue kallikreins 7 and 8 in intracranial malignancies
- Prognostic significance of the expression of SR-A1, encoding a novel SR-related CTD-associated factor, in breast cancer
- Suppression of TNF-α production by S-adenosylmethionine in human mononuclear leukocytes is not mediated by polyamines
- Topotecan and methotrexate alter expression of the apoptosis-related genes BCL2, FAS and BCL2L12 in leukemic HL-60 cells
- Two secreted cystatins of the soft tick Ornithodoros moubata: differential expression pattern and inhibitory specificity
- Acknowledgment
- Contents Biological Chemistry Volume 387, 2006
- Author Index
- Subject Index