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Related Experiment Videos

A phylogenetic analysis based on the gene encoding phosphoglycerate kinase.

G B Vohra1, G B Golding, N Tsao

  • 1Department of Biology, York University, Toronto, Ontario, Canada.

Journal of Molecular Evolution
|May 1, 1992
PubMed
Summary

Researchers sequenced the phosphoglycerate kinase gene in Tetrahymena thermophila, revealing typical eukaryotic characteristics and homology across diverse species. This study enhances understanding of glycolytic enzyme evolution in eukaryotes.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Phosphoglycerate kinase (PGK) is a crucial glycolytic enzyme.
  • Understanding PGK evolution provides insights into fundamental metabolic pathways.
  • Tetrahymena thermophila is a model organism for studying eukaryotic cell biology.

Purpose of the Study:

  • To determine the nucleotide sequence of the phosphoglycerate kinase (PGK) gene in Tetrahymena thermophila.
  • To derive the amino acid sequence of Tetrahymena PGK.
  • To investigate the evolutionary relationships of Tetrahymena PGK within eukaryotes.

Main Methods:

  • Genomic DNA and complementary DNA (cDNA) sequencing.
  • Open reading frame analysis to determine amino acid sequence.

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  • Phylogenetic analysis using aligned PGK amino acid sequences from 25 species.

    • Main Results:

    • The Tetrahymena thermophila PGK gene sequence was determined.
    • The gene contains a 1260-nucleotide open reading frame encoding 420 amino acids.
    • The Tetrahymena PGK sequence exhibits typical eukaryotic features and shows homology with sequences from diverse life forms.
    • Intron positions in Tetrahymena PGK correspond to mammalian PGK genes.
    • Phylogenetic analysis supports evolutionary relationships inferred from rRNA sequences.

    Conclusions:

    • The Tetrahymena thermophila PGK gene and protein sequence are characteristic of eukaryotic PGK.
    • Homology across a wide range of species highlights the conserved nature of PGK.
    • Phylogenetic reconstruction supports the evolutionary history of PGK, aligning with rRNA-based conclusions.