Plant hemoglobins may be maintained in functional form by reduced flavins in the nuclei, and confer differential tolerance to nitro-oxidative stress.

@article{Sainz2013PlantHM,
  title={Plant hemoglobins may be maintained in functional form by reduced flavins in the nuclei, and confer differential tolerance to nitro-oxidative stress.},
  author={Martha Sainz and Carmen P{\'e}rez-Rontom{\'e} and Javier Ramos and Jos{\'e} Miguel Mulet and Euan Kevin James and Ujjal Bhattacharjee and Jacob W Petrich and Manuel Becana},
  journal={The Plant journal : for cell and molecular biology},
  year={2013},
  volume={76 5},
  pages={875-87}
}
The heme of bacteria, plant and animal hemoglobins (Hbs) must be in the ferrous state to bind O(2) and other physiological ligands. Here we have characterized the full set of non-symbiotic (class 1 and 2) and 'truncated' (class 3) Hbs of Lotus japonicus. Class 1 Hbs are hexacoordinate, but class 2 and 3 Hbs are pentacoordinate. Three of the globins, Glb1-1, Glb2 and Glb3-1, are nodule-enhanced proteins. The O(2) affinity of Glb1-1 (50 pm) was the highest known for any Hb, and the protein may… CONTINUE READING
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