TABLE 3.
Chlorate and nitrate reductase activities in P. pantotrophus extracts
| Electron acceptor(s) | Activity (nmol min−1 mg of protein−1)
|
|||
|---|---|---|---|---|
| Chlorate reductase
|
Nitrate reductase
|
|||
| P. pantotrophus wild type | P. pantotrophus narR::Ω | P. pantotrophus wild type | P. pantotrophus narR::Ω | |
| NO3− | 3,600 | NDa | ||
| NO2− | 1,000 | 110 | ||
| N2O | 190 | 60 | ||
| N2O + NO3− | 2,100 | 65 | ||
| N2O + NO2− | 1,700 | 85 | ||
| O2 | <2 | <2 | ||
| O2 + NO3− | 10 | <2 | 65 | 70 |
| O2 + NO2− | <2 | <2 | ||
a
ND, not done. Activity could not be measured in P. pantotrophus narR::Ω which was unable to grow with nitrate as the sole electron acceptor.