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Pyruvate-phosphate Dikinase of Oxymonads and Parabasalia and the Evolution of Pyrophosphate-dependent Glycolysis in Anaerobic Eukaryotes

Overview
Journal Eukaryot Cell
Specialty Molecular Biology
Date 2006 Jan 10
PMID 16400177
Citations 23
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Abstract

In pyrophosphate-dependent glycolysis, the ATP/ADP-dependent enzymes phosphofructokinase (PFK) and pyruvate kinase are replaced by the pyrophosphate-dependent PFK and pyruvate phosphate dikinase (PPDK), respectively. This variant of glycolysis is widespread among bacteria, but it also occurs in a few parasitic anaerobic eukaryotes such as Giardia and Entamoeba spp. We sequenced two genes for PPDK from the amitochondriate oxymonad Streblomastix strix and found evidence for PPDK in Trichomonas vaginalis and other parabasalia, where this enzyme was thought to be absent. The Streblomastix and Giardia genes may be related to one another, but those of Entamoeba and perhaps Trichomonas are distinct and more closely related to bacterial homologues. These findings suggest that pyrophosphate-dependent glycolysis is more widespread in eukaryotes than previously thought, enzymes from the pathway coexists with ATP-dependent more often than previously thought and may be spread by lateral transfer of genes for pyrophosphate-dependent enzymes from bacteria.

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