| Thioalkalibacteraceae | |
|---|---|
Scientific classification  | |
| Domain: | Bacteria |
| Kingdom: | Pseudomonadati |
| Phylum: | Pseudomonadota |
| Class: | Gammaproteobacteria |
| Order: | Chromatiales |
| Family: | Thioalkalibacteraceae |
| Genera | |
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]
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]