3FS4

Crystal structure determination of Ostrich hemoglobin at 2.2 Angstrom resolution

3FS4 の概要

• エントリーDOI: 10.2210/pdb3fs4/pdb
• 分子名称: Hemoglobin subunit alpha-A, Hemoglobin subunit beta, PROTOPORPHYRIN IX CONTAINING FE, ... (5 entities in total)
• 機能のキーワード: hemoglobin, avian species, ostrich, quaternary structure, heme, iron, metal-binding, oxygen transport, polymorphism, transport, oxygen storage
• 由来する生物種: Struthio camelus (Ostrich); 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 66171.30

構造登録者

Sundaresan, S.S.,Ramesh, P.,Sivakumar, K.,Ponnuswamy, M.N. (登録日: 2009-01-09, 公開日: 2009-03-31, 最終更新日: 2023-11-01)

主引用文献

Ramesh, P.,Sundaresan, S.S.,Shobana, N.,Vinuchakkaravarthy, T.,Sivakumar, K.,Yasien, S.,Ponnuswamy, M.N.G.
Structural studies of hemoglobin from two flightless birds, ostrich and turkey: insights into their differing oxygen-binding properties.
Acta Crystallogr D Struct Biol, 77:690-702, 2021

PubMed Abstract: 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 Å, whereas two forms of turkey Hb were solved to resolutions of 1.66 Å (turkey monoclinic structure; TMS) and 1.39 Å (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-/R-state conformation.

PubMed: 33950023
DOI: 10.1107/S2059798321003417

実験手法

X-RAY DIFFRACTION (2.22 Å)