1y4q Summary

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T-To-T(High) quaternary transitions in human hemoglobin: betaF42A deoxy low-salt (1 test set)

The structure was published by Kavanaugh, J.S., Rogers, P.H., and Arnone, A., in 2005 in a paper entitled "Crystallographic evidence for a new ensemble of ligand-induced allosteric transitions in hemoglobin: the T-to-T(high) quaternary transitions." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 2.11 Å and deposited in 2004.

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

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