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

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