1B2V

HEME-BINDING PROTEIN A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The crystal structure of HasA, a hemophore secreted by Serratia marcescens.

Arnoux, P.Haser, R.Izadi, N.Lecroisey, A.Delepierre, M.Wandersman, C.Czjzek, M.

(1999) Nat Struct Biol 6: 516-520

  • DOI: 10.1038/9281
  • Primary Citation of Related Structures:  
    1B2V

  • PubMed Abstract: 
  • Free iron availability is strongly limited in vertebrate hosts, making the iron acquisition by siderophores inappropriate. Pathogenic bacteria have developed various ways to use the host's iron from iron-containing proteins. Serratia marcescens can u ...

    Free iron availability is strongly limited in vertebrate hosts, making the iron acquisition by siderophores inappropriate. Pathogenic bacteria have developed various ways to use the host's iron from iron-containing proteins. Serratia marcescens can use the iron from hemoglobin through the secretion of a hemophore called HasA, which takes up the heme from hemoglobin and shuttles it to the receptor HasR, which in turn, releases heme into the bacterium. We report here the first crystal structure of such a hemophore, bound to a heme group at two different pH values and at a resolution of 1.9 A. The structure reveals a new original fold and suggests a hypothetical mechanism for both heme uptake and release.


    Related Citations: 
    • Iron acquisition from heme and hemoglobin by a Serratia marcescens extracellular protein.
      Letoffe, S., Ghigo, J.M., Wandersman, C.
      (1994) Proc Natl Acad Sci U S A 91: 9876

    Organizational Affiliation

    Laboratoire d'Architecture et Fonction des Macromolécules Biologiques UPR 9039, Institut de Biologie Structurale et Microbiologie, CNRS, Marseille, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (HEME-BINDING PROTEIN A)A188Serratia marcescensMutation(s): 0 
Gene Names: hasA
Find proteins for Q54450 (Serratia marcescens)
Explore Q54450 
Go to UniProtKB:  Q54450
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.65α = 90
b = 80.66β = 93.58
c = 63.23γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-06-24
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2014-11-12
    Changes: Database references, Derived calculations