2dn1 Summary

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PDB entry 2dn1 (supersedes 2dfo)

1.25A resolution crystal structure of human hemoglobin in the oxy form

The structure was published by Park, S.-Y., Yokoyama, T., Shibayama, N., Shiro, Y., and Tame, J.R., in 2006 in a paper entitled "1.25 a resolution crystal structures of human haemoglobin in the oxy, deoxy and carbonmonoxy forms." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 1.25 Å and deposited in 2006.

The experimental data on which the structure is based was also deposited.

This PDB entry contains a complex of 2 biomacromolecules, namely Hemoglobin alpha subunit and Hemoglobin beta subunit.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule most likely forms heterotetramers.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A Hemoglobin alpha subunit P69905 (2-142) (HBA_HUMAN)search Homo sapienssearch 98% 141 99%
B Hemoglobin beta subunit P68871 (2-147) (HBB_HUMAN)search Homo sapienssearch 98% 146 99%


This entry contains 2 unique UniProt proteins:

UniProt accession Name Organism PDB
P69905 (2 - 142) Hemoglobin alpha subunit Homo sapiens
P68871 (2 - 147) Hemoglobin beta subunit Homo sapiens

Chain Structural classification (SCOP) Structural classification (CATH) Sequence family (Pfam)
A (P69905) Globinssearch Globinssearch PF00042: Globinsearch
B (P68871) Globinssearch Globinssearch PF00042: Globinsearch

Chain ID Molecular function (GO) Biological process (GO) Cellular component (GO)
A (P69905) iron ion bindingsearch protein bindingsearch oxygen transporter activitysearch haptoglobin bindingsearch peroxidase activitysearch metal ion bindingsearch heme bindingsearch oxygen bindingsearch oxidation-reduction processsearch bicarbonate transportsearch oxygen transportsearch response to hydrogen peroxidesearch small molecule metabolic processsearch transportsearch hydrogen peroxide catabolic processsearch positive regulation of cell deathsearch protein heterooligomerizationsearch cytosolic small ribosomal subunitsearch hemoglobin complexsearch extracellular regionsearch extracellular vesicular exosomesearch cytosolsearch haptoglobin-hemoglobin complexsearch endocytic vesicle lumensearch membranesearch blood microparticlesearch
B (P68871) haptoglobin bindingsearch oxygen transporter activitysearch protein bindingsearch metal ion bindingsearch oxygen bindingsearch hemoglobin bindingsearch peroxidase activitysearch heme bindingsearch iron ion bindingsearch oxygen transportsearch platelet aggregationsearch transportsearch bicarbonate transportsearch oxidation-reduction processsearch protein heterooligomerizationsearch response to hydrogen peroxidesearch regulation of blood pressuresearch positive regulation of cell deathsearch hydrogen peroxide catabolic processsearch nitric oxide transportsearch positive regulation of nitric oxide biosynthetic processsearch regulation of blood vessel sizesearch blood coagulationsearch small molecule metabolic processsearch renal absorptionsearch extracellular regionsearch haptoglobin-hemoglobin complexsearch blood microparticlesearch cytosolsearch endocytic vesicle lumensearch extracellular vesicular exosomesearch hemoglobin complexsearch

Chain InterPro annotation
A Globinsearch Haemoglobin, alphasearch Haemoglobin, pisearch Globin-likesearch Globin, structural domainsearch
B Globinsearch Haemoglobin, betasearch Globin-likesearch Globin, structural domainsearch