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Phytoglobins are globular plant (algae and land plant) proteins classified into the globin superfamily, which contain a heme, i.e. protoporphyrin IX-Fe, prosthetic group. The earliest known phytoglobins are leghemoglobins, discovered in 1939 by Kubo after spectroscopic and chemical analysis of the red pigment of soybean root nodules.[1] A few decades after Kubo's report the crystallization of a lupin phytoglobin (known as leghemoglobin) by Vainshtein and collaborators revealed that the tertiary structure of this protein and that of the sperm whale myoglobin was remarkably similar, thus indicating that the phytoglobin discovered by Kubo did indeed correspond to a globin.[2]
One important function of phytoglobin is its nitric oxide dioxygenase activity.[3]
- ^ Kubo H., Uber hamoprotein aus den wurzelknollchen von leguminosen, Acta Phytochim. (Tokyo), 11 (1939) 195-200.
- ^ Vainshtein B. K., Harutyunyan E. H., Kuranova I. P., Borisov V. V., N.I.Sosfenov, Pavlovsky A. G., Grebenko A. I.,Konareva N. V., Structure of leghaemoglobin from lupin root nodules at 5 A resolution., Nature, 254 (1975) 163-164
- ^ Becana, Manuel; Yruela, Inmaculada; Sarath, Gautam; Catalán, Pilar; Hargrove, Mark S. (September 2020). "Plant hemoglobins: a journey from unicellular green algae to vascular plants". New Phytologist. 227 (6): 1618–1635. doi:10.1111/nph.16444. hdl:10261/219101. PMID 31960995.