Asgard
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Related Articles from SNS
Functional class 2 CCA-adding enzymes in Asgard archaea and their implications for eukaryogenesis
CCA-adding enzymes are essential for transfer RNA (tRNA) maturation and translation among all domains of life. A long standing dogma holds that archaea encode exclusively class one CCA-adding enzymes (CCA1), whereas bacteria and eukaryotes encode class two enzymes (CCA2), creating a perceived strict evolutionary separation between archaeal and eukaryotic CCA adding enzymes. Here, we show that this view is incorrect.
Gene ancestries reveal diverse microbial associations during eukaryogenesis
Abstract The origin of eukaryotes remains a central enigma in biology1. Continuing debates agree on the pivotal role of a symbiosis between an alphaproteobacterium and an Asgard archaeon2,3. However, the nature, timing and contributions of other potential bacterial partners4,5,6 and the role of interactions with viruses7,8,9 remain contentious.