TABLE 3.

Summary of properties of ARR

PropertyShewanella sp. strain ANA-3Chrysiogenes arsenatisBacillus selenitireducens
Km (μM)530034
Vmax (U/mg of protein)11,1007,0132.5
Stoichiometryα1β1α1β1α1β1
LocalizationPeriplasmPeriplasmMembrane associated
Metal stoichiometry per mol of enzyme1.3 Mo: 16.5 Fe: 23.5 inorganic S0.89 Mo: 14 Fe: 16.4 inorganic S: 0.67 Zn0.18 Mo: 9 Fe
Substrate specificityArsenate onlyArsenate onlyArsenate, arsenite, selenate, selenite