1xxt Summary

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The T-to-T High Transitions in Human Hemoglobin: wild-type deoxy Hb A (low salt, one 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 1.91 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) iron ion bindingsearch oxygen bindingsearch heme bindingsearch protein bindingsearch peroxidase activitysearch haptoglobin bindingsearch metal ion bindingsearch oxygen transporter activitysearch oxygen transportsearch protein heterooligomerizationsearch positive regulation of cell deathsearch hydrogen peroxide catabolic processsearch small molecule metabolic processsearch bicarbonate transportsearch oxidation-reduction processsearch response to hydrogen peroxidesearch transportsearch extracellular vesicular exosomesearch hemoglobin complexsearch extracellular regionsearch haptoglobin-hemoglobin complexsearch endocytic vesicle lumensearch blood microparticlesearch cytosolsearch membranesearch cytosolic small ribosomal subunitsearch
B, D (P68871) heme bindingsearch iron ion bindingsearch oxygen bindingsearch metal ion bindingsearch protein bindingsearch oxygen transporter activitysearch haptoglobin bindingsearch peroxidase activitysearch hemoglobin bindingsearch oxygen transportsearch nitric oxide transportsearch positive regulation of nitric oxide biosynthetic processsearch transportsearch small molecule metabolic processsearch bicarbonate transportsearch regulation of blood vessel sizesearch blood coagulationsearch renal absorptionsearch protein heterooligomerizationsearch hydrogen peroxide catabolic processsearch positive regulation of cell deathsearch regulation of blood pressuresearch platelet aggregationsearch response to hydrogen peroxidesearch oxidation-reduction processsearch blood microparticlesearch cytosolsearch endocytic vesicle lumensearch hemoglobin complexsearch extracellular vesicular exosomesearch haptoglobin-hemoglobin complexsearch extracellular regionsearch

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