1yzi Summary

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A novel quaternary structure of human carbonmonoxy hemoglobin

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 2.07 Å and deposited in 2005.

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%
B 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 (P69905) Globinssearch Globinssearch PF00042: Globinsearch
B (P68871) Globinssearch Globinssearch PF00042: Globinsearch

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