1DKH

CRYSTAL STRUCTURE OF THE HEMOPHORE HASA, PH 6.5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 

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This is version 1.2 of the entry. See complete history


Literature

Functional aspects of the heme bound hemophore HasA by structural analysis of various crystal forms.

Arnoux, P.Haser, R.Izadi-Pruneyre, N.Lecroisey, A.Czjzek, M.

(2000) Proteins 41: 202-210

  • DOI: 10.1002/1097-0134(20001101)41:2<202::aid-prot50>3.0.co;2-8
  • Primary Citation of Related Structures:  
    1DK0, 1DKH

  • PubMed Abstract: 
  • The protein HasA from the Gram negative bacteria Serratia marcescens is the first hemophore to be described at the molecular level. It participates to the shuttling of heme from hemoglobin to the outer membrane receptor HasR, which in turn releases it into the bacterium ...

    The protein HasA from the Gram negative bacteria Serratia marcescens is the first hemophore to be described at the molecular level. It participates to the shuttling of heme from hemoglobin to the outer membrane receptor HasR, which in turn releases it into the bacterium. HasR alone is also able to take up heme from hemoglobin but synergy with HasA increases the efficiency of the system by a factor of about 100. This iron acquisition system allows the bacteria to survive with hemoglobin as the sole iron source. Here we report the structures of a new crystal form of HasA diffracting up to 1.77A resolution as well as the refined structure of the trigonal crystal form diffracting to 3.2A resolution. The crystal structure of HasA at high resolution shows two possible orientations of the heme within the heme-binding pocket, which probably are functionally involved in the heme-iron acquisition process. The detailed analysis of the three known structures reveals the molecular basis regulating the relative affinity of the heme/hemophore complex.


    Related Citations: 
    • 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

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEME-BINDING PROTEIN AA188Serratia marcescensMutation(s): 0 
Gene Names: hasA
UniProt
Find proteins for Q54450 (Serratia marcescens)
Explore Q54450 
Go to UniProtKB:  Q54450
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ54450
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
F [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
SM
Query on SM

Download Ideal Coordinates CCD File 
E [auth A]SAMARIUM (III) ION
Sm
DOSGOCSVHPUUIA-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A],
C [auth A],
D [auth A]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.65α = 90
b = 111.65β = 90
c = 52.79γ = 120
Software Package:
Software NamePurpose
SHARPphasing
CNSrefinement
DENZOdata reduction
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-12-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance