Protein phylogenies and signature sequences: a reappraisal of evolutionary relationships among archaebacteria, eubacteria, and eukaryotes

Article Abstract:

The evolutionary relationship of archaebacteria with the gram-positive bacteria was explained to prove that the primary division within prokaryotes was not solely dependent on archaebacteria and eubacteria but was between organisms possessing either a monoderm or a diderm cell structure. Phylogenetic analysis was conducted based on either nucleic acid or protein sequences. It was concluded that archaebacteria and gram-positive bacteria were ancestral in nature based on the sequence signature supported by a reference point and provided by the rooting of the prokaryotic tree.

Prokaryotes, Gram-negative bacteria, Evolution (Biology), Microorganisms, Origin of species, Archaeabacteria, Origin, Archaea

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Morphogenesis of Escherichia coli

Article Abstract:

Morphogenesis of Escherichia coli results in a cylindrical tube with hemispherical caps. A physical model of the shape of E. coli is provided, considering its shape-maintaining layer, cellular interior in relation to the cytoplasmic membrane, division and polarity. The situation of E. coli is also compared with that in higher organism to reflect the fact that eukaryotes and prokaryotes have similar problems to solve.

Observations, Escherichia coli, Morphogenesis

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Cytokinesis in prokaryotes and eukaryotes: common principles and different solutions

Article Abstract:

This review discusses cytokinesis in prokaryotes and eukaryotes at cellular, subcellular, and macromolecular levels along with the differences in the distribution of genetic material between these cell types. Results are discussed with reference to model systems comprised of mammals, Xenopus, Drosophila, nematode, and yeast and prokaryotes Escherichia, Bacillus, and Caulobacter.

Netherlands, Analysis, Physiological aspects, Genetic aspects, DNA, Cellular control mechanisms, Cell regulation, Chromosome replication, Spindle (Cell division), Spindle (Cytoplasm), Cytokinesis

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