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

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