2UYD

Crystal structure of the SmHasA mutant H83A

• PDB DOI: https://doi.org/10.2210/pdb2UYD/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Serratia marcescens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2007-04-04 Released: 2007-12-25 
• Deposition Author(s): Czjzek, M., Caillet-Saguy, C., Fournelle, A., Guigliarelli, B., Izadi-Pruneyre, N., Lecroisey, A.

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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 

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

• PubMed: 18162469 
• DOI: https://doi.org/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. 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.

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Organizational Affiliation: 

Unité de RMN des Biomolécules, CNRS URA 2185, Institut Pasteur, 75015 Paris, France. [e-mail]

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 20.48 kDa 
• Atom Count: 1,430 
• Modelled Residue Count: 175 
• Deposited Residue Count: 188 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEMOPHORE HASA	A [auth X]	188	Serratia marcescens	Mutation(s): 1
UniProt
Find proteins for Q54450 (Serratia marcescens) Explore Q54450  Go to UniProtKB:  Q54450

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	B [auth X]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
ZN	C [auth X], D [auth X], E [auth X], F [auth X], G [auth X], H [auth X], I [auth X], J [auth X]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
ACT	K [auth X], L [auth X]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

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 = 110.67	α = 90
b = 110.67	β = 90
c = 52.355	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALA	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-12-25 
Deposition Author(s): Czjzek, M., Caillet-Saguy, C., Fournelle, A., Guigliarelli, B., Izadi-Pruneyre, N., Lecroisey, A.

Revision History  

• 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
• Version 1.4: 2023-12-13
  Changes: Data collection, Database references, Derived calculations, Other, Refinement description