Abstract
Several features that are often regarded as unique to eukaryotic cells can be found in thermoacidophilic archaebacteria. These include the presence of histone proteins and an amoeboid cytoskeleton regulated by Ca 2+ . Also, the pathways of glucose degradation in Thermoplasma acidophilum are similar to those found in the cytoplasm of eukaryotic cells, not including the mitochondria. Each of these features evolved apparently as an adaptation to heat, acidity, or to the mode of nutrition of these organisms. In turn, they may have pre-adapted an organism from the thermoacidophilic group to become the ancestor of the nucleus and cytoplasm of eukaryotic cells.
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