3FS4

Crystal structure determination of Ostrich hemoglobin at 2.2 Angstrom resolution

Summary for 3FS4

• Entry DOI: 10.2210/pdb3fs4/pdb
• Descriptor: Hemoglobin subunit alpha-A, Hemoglobin subunit beta, PROTOPORPHYRIN IX CONTAINING FE, ... (5 entities in total)
• Functional Keywords: hemoglobin, avian species, ostrich, quaternary structure, heme, iron, metal-binding, oxygen transport, polymorphism, transport, oxygen storage
• Biological source: Struthio camelus (Ostrich); More
• Total number of polymer chains: 4
• Total formula weight: 66171.30

Authors

Sundaresan, S.S.,Ramesh, P.,Sivakumar, K.,Ponnuswamy, M.N. (deposition date: 2009-01-09, release date: 2009-03-31, Last modification date: 2023-11-01)

Primary citation

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

Experimental method

X-RAY DIFFRACTION (2.22 Å)