1mko Summary

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A Fourth Quaternary Structure of Human Hemoglobin A at 2.18 A Resolution

The structure was published by Safo, M.K. and Abraham, D.J., in 2005 in a paper entitled "The enigma of the liganded hemoglobin end state: a novel quaternary structure of human carbonmonoxy hemoglobin." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 2.18 Å and deposited in 2002.

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

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

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 chain P69905 (2-142) (HBA_HUMAN)search Homo sapienssearch 98% 141 100%
C Hemoglobin alpha chain P69905 (2-142) (HBA_HUMAN)search Homo sapienssearch 98% 141 100%
B Hemoglobin beta chain P68871 (2-147) (HBB_HUMAN)search Homo sapienssearch 98% 146 100%
D Hemoglobin beta chain P68871 (2-147) (HBB_HUMAN)search Homo sapienssearch 98% 146 100%


This entry contains 2 unique UniProt proteins:

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

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

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

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