Contrasting evolutionary histories of chloroplast 1 thioredoxins f and m

Hyman Hartman, Michael Syvanen, Bob B. Buchanan

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


Fourteen thiorcdoxin sequences were used to construct a minimal phylogenctic tree by using parsimony. The bacterial thioredoxins clustered into three groups: one containing the photosynthctic purple bacteria. Escherichia and Corynebacterinm; a second containing the photosynthetic green bacterium, Chlorobium. and a third containing cyanobacteria. These groupings are similar to those generated from earlier 16s RNA analyses. Animal thioredoxins formed a fourth group. The two thioredoxins of chloroplasts ( f and m) showed contrasting phylogenetic patterns. As predicted from prior studies, spinach chloroplast thiorcdoxin m grouped with its counterparts from cyanobacteria and eukaryotic algae, but. unexpectedly, thioredoxin f grouped with the animal thioredoxins. The results indicate that, during evolution, thioredoxin m of contemporary photosynthctic eukaryotic cells was derived from a prokaryotic symbiont, whereas thioredoxin f descended from an ancestral eukaryote common to plants and animals. The findings illustrate the potential of thioredoxin as a phylogenetic marker and suggest a relationship between the animal and f-type thioredoxins.

Original languageEnglish (US)
Pages (from-to)247-254
Number of pages8
JournalMolecular Biology and Evolution
Issue number3
StatePublished - 1990


  • Cell evolution
  • Minimal trees
  • Photosynthesis
  • Protein sequence
  • Thioredoxin

ASJC Scopus subject areas

  • Genetics
  • Biochemistry
  • Genetics(clinical)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Ecology, Evolution, Behavior and Systematics
  • Agricultural and Biological Sciences (miscellaneous)
  • Molecular Biology


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