Thioalkalibacteraceae

The Thioalkalibacteraceae are a family of extremophiles, namely halophilic, alkaliphilic or alkalitolerant, mesophilic to thermophilic obligately chemolithoautotrophic organisms in the Chromatiales comprising the genus Thioalkalibacter[1] and Guyparkeria.[2] The family is closely related to the family Halothiobacillaceae of halotolerant, mesophilic obligate autotrophs.[2]

Thioalkalibacteraceae
Scientific classification
Kingdom:	Bacteria
Phylum:	Proteobacteria
Class:	Gammaproteobacteria
Order:	Chromatiales
Family:	Thioalkalibacteraceae
Genera
Thioalkalibacter Guyparkeria

The type genus of the family is Thioalkalibacter, and both genera in the family are obligate autotrophs that fix carbon dioxide into biological material using the Calvin-Benson-Bassham cycle (using form IAc RuBisCO) and oxidise sulfur oxyanions, sulfide and elementary sulfur as their electron donor. All genera use ubiquinone-8 as their major respiratory quinone and have a G+C fraction of 54-68 mol%. Unlikely the closely related family the Halothiobacillaceae, no detectable polythionate intermediates of sulfur oxidation are detectable, and the Thioalkalibacteracaceae are obligate halophiles rather than halotolerant, as well as alkaliphilic or alkalitolerant, rather than mesophilic or acidotolerant.[2]

References

1. Banciu HL, Sorokin DY, Tourova TP, Galinski EA, Muntyan MS, Kuenen JG, Muyzer G (2008). "Influence of salts and pH on growth and activity of a novel facultatively alkaliphilic, extremely salt-tolerant, obligately chemolithoautotrophic sulfur-oxidizing Gammaproteobacterium Thioalkalibacter halophilus gen. nov., sp. nov. from South-Western Siberian soda lakes". Extremophiles. 12 (3): 391–404. doi:10.1007/s00792-008-0142-1. PMID 18309455.
2. Boden R (2017). "Reclassification of Halothiobacillus hydrothermalis and Halothiobacillus halophilus to Guyparkeria gen. nov. in the Thioalkalibacteraceae fam. nov., with emended descriptions of the genus Halothiobacillus and family Halothiobacillaceae" (PDF). International Journal of Systematic and Evolutionary Microbiology. 67 (10): 3919–3928. doi:10.1099/ijsem.0.002222. hdl:10026.1/9982. PMID 28884673.