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Plant hemoglobins: Important players at the crossroads between oxygen and nitric oxide
Author(s) -
Gupta Kapuganti J.,
Hebelstrup Kim H.,
Mur Luis A.J.,
Igamberdiev Abir U.
Publication year - 2011
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2011.10.036
Subject(s) - hexacoordinate , oxygen , nitric oxide , hemoglobin , biology , chemistry , biochemistry , organic chemistry , silicon
Plant hemoglobins constitute a diverse group of hemeproteins and evolutionarily belong to three different classes. Class 1 hemoglobins possess an extremely high affinity to oxygen and their main function consists in scavenging of nitric oxide (NO) at very low oxygen levels. Class 2 hemoglobins have a lower oxygen affinity and they facilitate oxygen supply to developing tissues. Symbiotic hemoglobins in nodules have mostly evolved from class 2 hemoglobins. Class 3 hemoglobins are truncated and represent a clade with a very low similarity to class 1 and 2 hemoglobins. They may regulate oxygen delivery at high O 2 concentrations. Depending on their physical properties, hemoglobins belong either to hexacoordinate non‐symbiotic or pentacoordinate symbiotic groups. Plant hemoglobins are plausible targets for improving resistance to multiple stresses.