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Thermoproteati is a kingdom of archaea. Its synonym, "TACK", is an acronym for "Candidatus Thaumarchaeota" (now Nitrososphaerota), "Ca. Aigarchaeota", "Crenarchaeota (now Thermoproteota), and "Ca. Korarchaeota", the first groups discovered. They are found in different environments ranging from acidophilicthermophiles to mesophiles and psychrophiles and with different types of metabolism, predominantly anaerobic and chemosynthetic.[6] Thermoproteati is a kingdom that is sister to the "Asgard" branch that gave rise to the eukaryotes. It has been proposed that the Thermoproteati kingdom be classified as "Crenarchaeota" and that the traditional "Crenarchaeota" (Thermoproteota) be classified as a class called Sulfolobia, along with the other phyla with class rank or order.[7] After including the kingdom category into ICNP, the only validly published name of this group is kingdom Thermoproteati (Guy and Ettema 2024).[8]
"Ca. Augarchaeota". It is a phylum proposed from the genome of the candidate species "CandidiatusCaldiarchaeumsubterraneum" (now belongs to Thermoproteota as "Candidiatus Caldarchaeum subterraneum")[9][10] found deep within a gold mine in Japan. Genomic sequences of this group have also been found in geothermal environments, both terrestrial and marine.
Thermoproteota (formerly "Crenarchaeota"). It is the best-known edge and the most abundant archaea in the marine ecosystem. They were previously called sulfobacteria because of their dependence on sulfur and are important as carbon fixers. There are hyperthermophiles in hydrothermal vents and other groups are the most abundant at depths of less than 100 m.
One piece of evidence supporting a close relationship between Thermoproteati and eukaryotes is the presence of a homolog of the RNA polymerase subunit Rbp-8 in Thermoproteota but not in "Euryarchaea".[21]
^Guy, Lionel; Ettema, Thijs J.G. (2011). "The archaeal 'TACK' superphylum and the origin of eukaryotes". Trends in Microbiology. 19 (12): 580–587. doi:10.1016/j.tim.2011.09.002. PMID22018741.
