4XS0 image
Entry Detail
PDB ID:
4XS0
Keywords:
METAL TRANSPORT
Title:
Human methemoglobin in complex with the second and third NEAT domains of IsdH(F365Y/A369F/Y642A) from Staphylococcus aureus
Biological Source:
Source Organism:
Staphylococcus aureus, Homo sapiens
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2015-01-21
Release Date:
2015-06-03
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.55 Å
R-Value Free:
0.28
R-Value Work:
0.25
R-Value Observed:
0.26
Space Group:
P 65 2 2
4XS0 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Hemoglobin subunit alpha
Chain IDs:A
Chain Length:141
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P69905 Pfam ID:PF00042
Protein Blast
Polymer Type:polypeptide(L)
Description:Hemoglobin subunit beta
Chain IDs:B
Chain Length:146
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P68871 Pfam ID:PF00042
Protein Blast
Polymer Type:polypeptide(L)
Description:Iron-regulated surface determinant protein H
Mutations:F365Y/A369F/Y642A
Chain IDs:C
Chain Length:336
Number of Molecules:1
Biological Source:Staphylococcus aureus
UniProt ID:Q2FG07 Pfam ID:PF05031, PF20861
Ligand Molecules
CL
HEM
SO4
Primary Citation
The structure of haemoglobin bound to the haemoglobin receptor IsdH from Staphylococcus aureus shows disruption of the native alpha-globin haem pocket.
Acta Crystallogr.,Sect.D 71 1295 1306 (2015)
PMID: 26057669 DOI: 10.1107/S1399004715005817

Abstact

Staphylococcus aureus is a common and serious cause of infection in humans. The bacterium expresses a cell-surface receptor that binds to, and strips haem from, human haemoglobin (Hb). The binding interface has previously been identified; however, the structural changes that promote haem release from haemoglobin were unknown. Here, the structure of the receptor-Hb complex is reported at 2.6 Å resolution, which reveals a conformational change in the α-globin F helix that disrupts the haem-pocket structure and alters the Hb quaternary interactions. These features suggest potential mechanisms by which the S. aureus Hb receptor induces haem release from Hb.

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Primary Citation of related structures
4IJ2