2UYD

Crystal structure of the SmHasA mutant H83A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

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This is version 1.3 of the entry. See complete history


Literature

Deciphering the Structural Role of Histidine 83 for Heme Binding in Hemophore Hasa.

Caillet-Saguy, C.Turano, P.Piccioli, M.Lukat-Rodgers, G.S.Czjzek, M.Guigliarelli, B.Izadi-Pruneyre, N.Rodgers, K.R.Delepierre, M.Lecroisey, A.

(2008) J Biol Chem 283: 5960

  • DOI: 10.1074/jbc.M703795200
  • Primary Citation of Related Structures:  
    2UYD

  • PubMed Abstract: 
  • Heme carrier HasA has a unique type of histidine/tyrosine heme iron ligation in which the iron ion is in a thermally driven two spin states equilibrium. We recently suggested that the H-bonding between Tyr75 and the invariantly conserved residue His83 modulates the strength of the iron-Tyr75 bond ...

    Heme carrier HasA has a unique type of histidine/tyrosine heme iron ligation in which the iron ion is in a thermally driven two spin states equilibrium. We recently suggested that the H-bonding between Tyr75 and the invariantly conserved residue His83 modulates the strength of the iron-Tyr75 bond. To unravel the role of His83, we characterize the iron ligation and the electronic properties of both wild type and H83A mutant by a variety of spectroscopic techniques. Although His83 in wild type modulates the strength of the Tyr-iron bond, its removal causes detachment of the tyrosine ligand, thus giving rise to a series of pH-dependent equilibria among species with different axial ligation. The five coordinated species detected at physiological pH may represent a possible intermediate of the heme transfer mechanism to the receptor.


    Organizational Affiliation

    Unité de RMN des Biomolécules, CNRS URA 2185, Institut Pasteur, 75015 Paris, France. ccaillet@pasteur.fr



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEMOPHORE HASAA [auth X]188Serratia marcescensMutation(s): 1 
Gene Names: hasA
UniProt
Find proteins for Q54450 (Serratia marcescens)
Explore Q54450 
Go to UniProtKB:  Q54450
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.67α = 90
b = 110.67β = 90
c = 52.355γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-05-08
    Changes: Data collection, Experimental preparation, Other