6zmx | pdb_00006zmx

Crystal structure of hemoglobin from turkey (Meleagiris gallopova) crystallized in orthorhombic form at 1.4 Angstrom resolution

spinqualitylabelsall models 6zmx, resolution 1.39Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6zmx is a 4 chain structure with sequence from Meleagris gallopavo. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.389Å Ligands: HEM, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HBA_MELGA Involved in oxygen transport from the lung to the various peripheral tissues. Publication Abstract from PubMed Crystal structures of hemoglobin (Hb) from two flightless birds, ostrich (Struthio camelus) and turkey (Meleagris gallopova), were determined. The ostrich Hb structure was solved to a resolution of 2.22 A, whereas two forms of turkey Hb were solved to resolutions of 1.66 A (turkey monoclinic structure; TMS) and 1.39 A (turkey orthorhombic structure; TOS). Comparison of the amino-acid sequences of ostrich and turkey Hb with those from other avian species revealed no difference in the number of charged residues, but variations were observed in the numbers of hydrophobic and polar residues. Amino-acid-composition-based computation of various physical parameters, in particular their lower inverse transition temperatures and higher average hydrophobicities, indicated that the structures of ostrich and turkey Hb are likely to be highly ordered when compared with other avian Hbs. From the crystal structure analysis, the liganded state of ostrich Hb was confirmed by the presence of an oxygen molecule between the Fe atom and the proximal histidine residue in all four heme regions. In turkey Hb (both TMS and TOS), a water molecule was bound instead of an oxygen molecule in all four heme regions, thus confirming that they assumed the aqua-met form. Analysis of tertiary- and quaternary-structural features led to the conclusion that ostrich oxy Hb and turkey aqua-met Hb adopt the R-/RH-state conformation. Structural studies of hemoglobin from two flightless birds, ostrich and turkey: insights into their differing oxygen-binding properties.,Ramesh P, Sundaresan SS, Shobana N, Vinuchakkaravarthy T, Sivakumar K, Yasien S, Ponnuswamy MNG Acta Crystallogr D Struct Biol. 2021 May 1;77(Pt 5):690-702. doi:, 10.1107/S2059798321003417. Epub 2021 Apr 26. PMID:33950023 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hemoglobin 3D structures

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