Molecular Biology and Evolution 17:989-1000 (2000)
© 2000 Society for Molecular Biology and Evolution
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Enolase from Trypanosoma brucei, from the Amitochondriate Protist Mastigamoeba balamuthi, and from the Chloroplast and Cytosol of Euglena gracilis: Pieces in the Evolutionary Puzzle of the Eukaryotic Glycolytic Pathway
*Research Unit for Tropical Diseases, Christian de Duve Institute of Cellular Pathology, Department of Biochemistry, Université catholique de Louvain, Brussels, Belgium;
Institute of Evolutionary Biology, Department of Biology, Universität Konstanz, Konstanz, Germany;
Institut für Botanik, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany;
§The Rockefeller University, New York; and
||Institute of Marine Biosciences, National Research Council, Halifax, Nova Scotia, Canada
Genomic or cDNA clones for the glycolytic enzyme enolase were isolated from the amitochondriate pelobiont Mastigamoeba balamuthi, from the kinetoplastid Trypanosoma brucei, and from the euglenid Euglena gracilis. Clones for the cytosolic enzyme were found in all three organisms, whereas Euglena was found to also express mRNA for a second isoenzyme that possesses a putative N-terminal plastid-targeting peptide and is probably targeted to the chloroplast. Database searching revealed that Arabidopsis also possesses a second enolase gene that encodes an N-terminal extension and is likely targeted to the chloroplast. A phylogeny of enolase amino acid sequences from 6 archaebacteria, 24 eubacteria, and 32 eukaryotes showed that the Mastigamoeba enolase tended to branch with its homologs from Trypanosoma and from the amitochondriate protist Entamoeba histolytica. The compartment-specific isoenzymes in Euglena arose through a gene duplication independent of that which gave rise to the compartment-specific isoenzymes in Arabidopsis, as evidenced by the finding that the Euglena enolases are more similar to the homolog from the eubacterium Treponema pallidum than they are to homologs from any other organism sampled. In marked contrast to all other glycolytic enzymes studied to date, enolases from all eukaryotes surveyed here (except Euglena) are not markedly more similar to eubacterial than to archaebacterial homologs. An intriguing indel shared by enolase from eukaryotes, from the archaebacterium Methanococcus jannaschii, and from the eubacterium Campylobacter jejuni maps to the surface of the three-dimensional structure of the enzyme and appears to have occurred at the same position in parallel in independent lineages.
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