9.B.393. The DUF2231 (DUF2231) Family
These proteins are of about 150 to 200 aas in size and have 4 TMSs. Some homologues are annotated as Rieske 2Fe-2S proteins, and others are annotated as rubrerythrin or rubredoxin-type Fe(cys)4 proteins. Consequently, they may be redox proteins.
DUF2231 protein of 178 aas and 4 TMSs. It is a rubredoxin_like; nonheme iron binding domain containing a [Fe(SCys)4] center. The family includes rubredoxins, a small electron transfer protein, and a slightly smaller modular rubredoxin domain present in rubrerythrin and nigerythrin.
DUF2231 protein of archaeon CG07 (groundwater metagenome)
Rubrerythrin of 185 aas and 4 TMSs.
Rubreythrin of Anaeroarcus burkinensis
Uncharacterized protein of 186 aas and 4 TMSs.
UP of Geothermobacter ehrlichii
Rubredoxin of 209 aas and 4 C-terminal TM
Rubredoxin of Desulfococcus oleovorans
Uncharacterized protein of 158 aas and 4 TMSs.
UP of Bacteroidetes bacterium GWA2 (subsurface metagenome)
DUF2231 domain-containing protein of 168 aas and 4 TM
DUF2231 protein of Micromonospora maritima
Uncharacterized protein of 459 aas and 4 N-terminal TMSs that belong to the 9.B.393 family, but a much longer region C-terminal of this short domain that shows sequence similarity with TC family 1.B.14.
UP of Aquimarina agarivorans