Plant and cyanobacterial hemoglobins reduce nitrite to nitric oxide under anoxic conditions.

@article{Sturms2011PlantAC,
  title={Plant and cyanobacterial hemoglobins reduce nitrite to nitric oxide under anoxic conditions.},
  author={Ryan Sturms and Alan A DiSpirito and Mark S Hargrove},
  journal={Biochemistry},
  year={2011},
  volume={50 19},
  pages={3873-8}
}
The ability of ferrous hemoglobins to reduce nitrite to form nitric oxide has been demonstrated for hemoglobins from animals, including myoglobin, blood cell hemoglobin, neuroglobin, and cytoglobin. In all cases, the rate constants for the bimolecular reactions with nitrite are relatively slow, with maximal values of ~5 M(-1) s(-1) at pH 7. Combined with the relatively low concentrations of nitrite found in animal blood plasma (normally no greater than 13 μM), these slow reaction rates are… CONTINUE READING