Complex archaea that bridge the gap between prokaryotes and eukaryotes
نویسندگان
چکیده
منابع مشابه
Another Bridge between Kingdoms: tRNA Splicing in Archaea and Eukaryotes
in a multistep process requiring ATP and GTP, leaving a 2Ј-phosphate at the splice junction. In a remarkable * Molecular Genetics Program Wadsworth Center final step, the phosphotransferase removes the 2Ј phosphate by transfer to NAD, generating a mature tRNA New York State Department of Health and School of Public Health with a standard 3Ј–5Ј linkage at the ligation junction Archaeal tRNA intr...
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The eocyte hypothesis, in which Eukarya emerged from within Archaea, has been boosted by the description of a new candidate archaeal phylum, "Lokiarchaeota", from metagenomic data. Eukarya branch within Lokiarchaeota in a tree reconstructed from the concatenation of 36 universal proteins. However, individual phylogenies revealed that lokiarchaeal proteins sequences have different evolutionary h...
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Accumulating data suggest that the eukaryotic cell originated from a merger of two prokaryotes, an archaeal host and a bacterial endosymbiont. However, since prokaryotes are unable to perform phagocytosis, the means by which the endosymbiont entered its host is an enigma. We suggest that a predatory or parasitic interaction between prokaryotes provides a reasonable explanation for this conundru...
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The ubiquity of arsenic in the environment has led to the evolution of enzymes for arsenic detoxification. An initial step in arsenic metabolism is the enzymatic reduction of arsenate [As(V)] to arsenite [As(III)]. At least three families of arsenate reductase enzymes have arisen, apparently by convergent evolution. The properties of two of these are described here. The first is the prokaryotic...
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The genetic code, the set of rules by which information encoded in genetic material, is found in every cell of every living organism. This code consists of all possible combinations of trinucleotide sequences in coding regions, called codons. With a few exceptions, such as startand stop-codons, a triplet codon in a DNA sequence specifies a single amino acid – protein’s building block. The human...
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ژورنال
عنوان ژورنال: Nature
سال: 2015
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nature14447