1xz5 Summary

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T-to-THigh Quaternary Transitions in Human Hemoglobin: alphaL91A deoxy low-salt

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