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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.
It also strives to be a fully up-to-date scientfic account of the discovery process for which we all owe a vote of thanks to the many researchers whose work is illustrated and cited in this extensive review article. The transition to enclosed cells is likely to have been in an active iron-sulphur reaction phase still present in living cells and associated with sodium-proton anti-porters activating ATP (Lane and Martin 2012, Lane 2009b), leading in turn to electron transport and some of the most ancient proteins, such as ferredoxin, The universal common ancestor of the three domains of life may have thus been a proton-pumping membranous interface from which archaea and bacteria emerged as free-living adaptions.
Following a phase of biogenesis possibly emerging directly from cosmic symmetry-breaking (King 1978, 2004), based on spontaneous prebiotic RNA synthesis (Powner et. 2009, 2010) recent research suggests that the last universal common ancestor (LUCA) of all life on the planet may have arisen before the first cells, from a phase interface between alkaline hydrogen-emitting undersea vents and the archaic acidified iron-rich ocean (Martin and Russel 2003) in which differential dynamics in membranous micropores in the vents managed to concentrate polypeptides and polynucleotides to biologically sustainable levels (Baaske et. This is suggested by fundamental differences in their cell walls and other details of evolutionary relationships among some of the oldest genes.
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I have updated and amended this several times as new research has clarified specific parts of the trunk and branches.
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The archaea also use a unique form of electron transport in methanogenesis (Schafer 2004). The viral SF3 superfamily (Leitão 2015) helicase tree shows variants active on both RNA and SNA substrates, consistent with an origin in the RNA era (Caprari et al. Supporting the notion of subunits, a beta-chain of ATP synthase is homologous to a hepatic lipoprotein receptor (Martinez et al. Fig 1b2: Left: Rotary action of ATPsynthase, shown centre. Right: Evolutionary tree of viral RNAhelicase includes forms active in both RNA and single and double-stranded DNA viruses (Caprari et al. Respiratory electron transport occurs in both aerobic and anaerobic organisms and the terminal oxidases, iron-sulphur proteins and flavin-binding polypeptides all show evolutionary trees reaching back to the common ancestor of the three domains, implying terminal oxidases predate oxygenic photosynthesis.
The extremely ancient origin of the rhodopsin family of heptahelical receptors can be seen from the ultra-primitive archael photosynthesis in Halobacteria, which relies on direct coupling between photo-stimulated chemiosmotic H-dependent ATPsynthase universal to the chemiosmotic coupling of electron transport to ATP production is a rotary motor which appears to have evolved from two separate subunits, one of which has been proposed to be a helicase (Doering et al. Hexameric helicases are found both in the SF3 superfamily in viruses (Hickman & Dyda 2005) and the MCM helicases are critical to replication forks in diverse organisms from humans to archaea (Fletcher et al. The fact that many components of archaeal electron transport are significantly different in structure from those of bacteria implies these evolved separately and that archaeal electron transport is not simply a more recent result of horizontal transfer (Schafer 2004).