Evolutionary divergence and salinity-mediated selection in halophilic archaea

Article Abstract:

A study was conducted to examine the effects of fluctuations in environmental salinity on the primary sequence and tertiary structure of halophilic archaea. Results indicate that fluctuating environmental salinity drives halophilic genes to produce higher proportions of nonsynomymous nucleotide substitutions that, in effect, inhibits the fitness optimization of these organisms. It was also noted that the drop on environmental salinity explains the unusual evolutionary divergence of the archaea's encoding genes.

Salinity

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Bioenergetics of the archaea

Article Abstract:

Studies have revealed the presence of new coenzyme factors in the methanogenesis and new energy-conserving pathways during close scrutiny of the biosynthesis and related processes involving archaea. Novel mechanisms of proton pumping and novel light-induced mechanisms were also discovered during the study of the unusual composition of archaeal respiratory complexes. Proton pumping mechanisms of heterodisulfide reductase other archaeal membrane protein complexes continue to be understood at the molecular level.

Eukaryotic cells, Cells (Biology), Eukaryotes, Energy metabolism, Bioenergetics, Methanobacteriaceae, Methanogens

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Archaea and the prokaryote-to-eukaryote transition

Article Abstract:

The phylogentic links amongst the contemporary domains of life, the archaea, bacterial and eucarya have been significant in the study of early cellular evolution. Important issues are whether they are monophyletic, and where the root of the universal tree lies. Study of the archaea has become central to answering such questions, and its relationship to bacteria and eucarya is discussed.

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