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What controls glycolysis in bloodstream form Trypanosoma brucei?

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Bakker, B M Michels, Paulus [UCL] Opperdoes, Frederik [UCL] Westerhoff, H V

On the basis of the experimentally determined kinetic properties of the trypanosomal enzymes, the question is addressed of which step limits the glycolytic flux in bloodstream form Trypanosoma brucei. There appeared to be no single answer; in the physiological range, control shifted between the glucose transporter on the one hand and aldolase (ALD), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), phosphoglycerate kinase (PGK), and glycerol-3-phosphate dehydrogenase (GDH) on the other hand. The other kinases, which are often thought to control glycolysis, exerted little control; so did the utilization of ATP. We identified potential targets for anti-trypanosomal drugs by calculating which steps need the least inhibition to achieve a certain inhibition of the glycolytic flux in these parasites. The glucose transporter appeared to be the most promising target, followed by ALD, GDH, GAPDH, and PGK. By contrast, in erythrocytes more than 95% deficiencies of PGK, GAPDH, or ALD did not cause any clinical symptoms (Schuster, R. and Holzhütter, H.-G. (1995) Eur. J. Biochem. 229, 403-418). Therefore, the selectivity of drugs inhibiting these enzymes may be much higher than expected from their molecular effects alone. Quite unexpectedly, trypanosomes seem to possess a substantial overcapacity of hexokinase, phosphofructokinase, and pyruvate kinase, making these "irreversible" enzymes mediocre drug targets.

Document type Article de périodique (Journal article) – Journal Article, Research Support, Non-U.S. Gov't
Access type Accès restreint
Publication date 1999
Journal information "The Journal of biological chemistry" - Vol. 274, no. 21, p. 14551-9 (1999)
Peer reviewed yes
issn 0021-9258
Publication status Publié
Affiliation UCL - MD/BICL - Département de biochimie et de biologie cellulaire
MESH Subject Adenosine Triphosphate - metabolism ; Animals ; Antiprotozoal Agents - pharmacology ; Blood - parasitology ; Fructose-Bisphosphate Aldolase - metabolism ; Glucose - metabolism ; Glyceraldehyde-3-Phosphate Dehydrogenases - metabolism ; Glycerolphosphate Dehydrogenase - metabolism ; Glycolysis - physiology ; Phosphoglycerate Kinase - metabolism ; Pyruvate Kinase - metabolism ; Trypanosoma brucei brucei - metabolism
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Bibliographic reference Bakker, B M ; Michels, Paulus ; Opperdoes, Frederik ; Westerhoff, H V. What controls glycolysis in bloodstream form Trypanosoma brucei?. In: The Journal of biological chemistry, Vol. 274, no. 21, p. 14551-9 (1999)
Permanent URL http://hdl.handle.net/2078.1/26976