Plant hemoglobins: Important players at the crossroads between oxygen and nitric oxide

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  • Kapuganti J Gupta, Department of Plant Physiology, University of Rostock, Tyskland
  • Kim Hebelstrup
  • Luis A J Mur, Aberystwyth University, IBERS-Institute of Biological, Environmental and Rural Sciences, Storbritannien
  • Abir U Igamberdiev, Department of Biology, Memorial University of Newfoundland, Canada

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 O2 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.

TidsskriftF E B S Letters
Sider (fra-til)3843-3849
Antal sider7
StatusUdgivet - 15 dec. 2011

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