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A Glyceraldehyde-3-phosphate Dehydrogenase with Eubacterial Features in the Amitochondriate Eukaryote, Trichomonas Vaginalis

Overview
Journal J Mol Evol
Specialty Biochemistry
Date 1993 Dec 1
PMID 8114116
Citations 19
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Abstract

Glyceraldehyde-3-phosphate dehydrogenase (GAPDH), localized in the cytosol of Trichomonas vaginalis, was partially purified. The enzyme is specific for NAD+ and is similar in most of its catalytic properties to glycolytic GAPDHs from other organisms. Its sensitivity to koningic acid is similar to levels observed in GAPDHs from eubacteria and two orders of magnitude lower than those observed for eukaryotic GAPDHs. The complete amino acid sequence of T. vaginalis GAPDH was derived from the N-terminal sequence of the purified protein and the deduced sequence of a cDNA clone. It showed great similarity to other eubacterial and eukaryotic GAPDH sequences. The sequence of the S-loop displayed a eubacterial signature. The overall sequence was more similar to eubacterial sequences than to cytosolic and glycosomal eukaryotic sequences. In phylogenetic trees obtained with distance matrix and parsimony methods T. vaginalis GAPDH clustered with its eubacterial homologs. GAPDHs of other amitochondriate protists, belonging to early branches of the eukaryotic lineage (Giardia lamblia and Entamoeba histolytica--Smith M.W. and Doolittle R.F., unpublished data in GenBank), showed typical eukaryotic signatures and clustered with other eukaryotic sequences, indicating that T. vaginalis GAPDH occupies an anomalous position, possibly due to horizontal gene transfer from a eubacterium.

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