Table 1 Distribution and Sec evolutionary trends of 25 bacterial selenoprotein families

Formate dehydrogenase alpha subunit (FdhA)

Selenophosphate synthetase (SelD)

Coenzyme F420-reducing hydrogenase delta subunit (FrhD)^a

Heterodisulfide reductase, subunit A (HdrA)^a

Peroxiredoxin (Prx)^a

HesB-like

Glycine reductase selenoprotein A (GrdA)

Glycine reductase selenoprotein B (GrdB)^a

SelW-like^a

Prx-like thiol:disulfide oxidoreductase^a

Thioredoxin (Trx)^a

Coenzyme F420-reducing hydrogenase α subunit (FrhA)^a

Fe-S oxidoreductase (GlpC)

Proline reductase (PR)^a

DsbA-like^a

Glutaredoxin (Grx)^a

Thiol:disulfide interchange protein^a

AhpD-like (COG2128)^a

ArsC-like^a

DsbG-like^a

Distant AhpD homolog^a

Homolog of AhpF, amino-terminal domain^a

DsrE-like^a

NADH oxidase

Glutathione peroxidase (GPx)^a

Total