3wct | pdb_00003wct

The structure of a deoxygenated 400 kda hemoglobin provides a more accurate description of the cooperative mechanism of giant hemoglobins: Oxygenated form

spinqualitylabelsall models 3wct, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wct is a 8 chain structure with sequence from Lamellibrachia satsuma. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, HEM, OXY, FUC, MAN, NAG Related: 3wcu, 3wcv, 3wcw Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The quaternary structures of invertebrate haemoglobins (Hbs) are quite different from those of vertebrate Hbs. The extracellular giant Hbs of molecular masses of about 400 and 3600 kDa are composed of a dome-shaped dodecameric subassembly which consists of four individual globin subunits. Several crystal structures of 400 kDa Hbs from annelids have been reported, including structures in oxygenated and partially unliganded states, but the structure of the fully deoxygenated state has not been reported. In the present study, crystal structures of V2Hb from the tube worm Lamellibrachia satsuma have been determined in both the fully oxygenated and deoxygenated states. A glycosylation site and novel metal-binding sites for divalent cations were clearly observed with no intersubunit interactions in V2Hb. A comparison of the oxygenated and the deoxygenated forms of V2Hb reveals that the ternary- and quaternary-structural changes occur in a manner that maintains the molecular D3 symmetry. These structures suggest that the mechanisms of quaternary-structural changes between the oxy and deoxy states for the giant Hbs are identical across species. The structure of a deoxygenated 400 kDa haemoglobin reveals ternary- and quaternary-structural changes of giant haemoglobins.,Numoto N, Nakagawa T, Ohara R, Hasegawa T, Kita A, Yoshida T, Maruyama T, Imai K, Fukumori Y, Miki K Acta Crystallogr D Biol Crystallogr. 2014 Jul 1;70(Pt 7):1823-31. doi:, 10.1107/S1399004714008475. Epub 2014 Jun 29. PMID:25004960 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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