3SZK image
Deposition Date 2011-07-19
Release Date 2011-09-14
Last Version Date 2023-11-01
Entry Detail
PDB ID:
3SZK
Title:
Crystal Structure of Human metHaemoglobin Complexed with the First NEAT Domain of IsdH from Staphylococcus aureus
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.01 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Hemoglobin subunit beta
Gene (Uniprot):HBB
Chain IDs:B, C (auth: E)
Chain Length:146
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Hemoglobin subunit alpha
Gene (Uniprot):HBA1, HBA2
Chain IDs:A (auth: D), E (auth: A)
Chain Length:141
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Iron-regulated surface determinant protein H
Gene (Uniprot):isdH
Chain IDs:D (auth: F), F (auth: C)
Chain Length:164
Number of Molecules:2
Biological Source:Staphylococcus aureus
Ligand Molecules
Primary Citation
Structural basis for hemoglobin capture by Staphylococcus aureus cell-surface protein, IsdH
J.Biol.Chem. 286 38439 38447 (2011)
PMID: 21917915 DOI: 10.1074/jbc.M111.287300

Abstact

Pathogens must steal iron from their hosts to establish infection. In mammals, hemoglobin (Hb) represents the largest reservoir of iron, and pathogens express Hb-binding proteins to access this source. Here, we show how one of the commonest and most significant human pathogens, Staphylococcus aureus, captures Hb as the first step of an iron-scavenging pathway. The x-ray crystal structure of Hb bound to a domain from the Isd (iron-regulated surface determinant) protein, IsdH, is the first structure of a Hb capture complex to be determined. Surface mutations in Hb that reduce binding to the Hb-receptor limit the capacity of S. aureus to utilize Hb as an iron source, suggesting that Hb sequence is a factor in host susceptibility to infection. The demonstration that pathogens make highly specific recognition complexes with Hb raises the possibility of developing inhibitors of Hb binding as antibacterial agents.

Legend

Protein

Chemical

Disease

Primary Citation of related structures