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Fig 1c2: Left: Evolutionary tree of selenophosphate synthetase (Romero et al. Centre: SECIS hairpins of archaea (A), bacteria (B) and corresponding eukaryote variants (C, D) (Moldave ed 2006).

This article seeks to be a real time account of the discovery processes showing us in ever-incteasing detail, the nature of the tree and its many tangled interactions, both at the genetic and organismic level. 2009), giving rise to the RNA era, while at the same time providing a free energy source based on proton transport across membranous microcellular interfaces resulting from fatty acids also being concentrated above their critical aggregate concentration.You must be at least 18-years old or the age of majority where you live (whichever is greater) and agree to all of the terms below before continuing.If you do not agree to any of the following, please leave this Website immediately.In particular, in the evolution of the aminoacyl-t RNA synthetases (aa RS), coupling an amino acid to its respective t-RNA, analysis of genetic trees shows that there have been multiple horizontal transfer of such genes, including some from putative sister species of LUCA, in a similar manner to the introgression of Neanderthal DNA into One intriguing indication of the state of genetic translation in LUCA is the incorporation of selenocysteine into the genetic code.Selenoenzymes which contain selenocysteine as a genetically translated amino acid are essential to the three domains of life and source back to LUCA, despite the fact that the 21st coded amino acid selenocysteine could not be fitted into the genetic code.

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SECIS is an unusual hairpin loop structure which has varying forms in archaea and prokaryotes with both forms appearing in eucaryotes, but they have a common feature of a highly conserved hairpin loop forming an RNA translational catalyst, which literally takes over some of the ribosomal RNA function, binding to the selenocysteine t-RNA and coupling selenocysteine to the nascent protein chain, as shown in fig 1c2.

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