2GLN

Crystal structure of Mycobacterium tuberculosis trHbN, GlnE11Ala mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.98 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.176 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Ligand interactions in the distal heme pocket of Mycobacterium tuberculosis truncated hemoglobin N: roles of TyrB10 and GlnE11 residues

Ouellet, Y.Milani, M.Couture, M.Bolognesi, M.Guertin, M.

(2006) Biochemistry 45: 8770-8781

  • DOI: https://doi.org/10.1021/bi060112o
  • Primary Citation of Related Structures:  
    2GKM, 2GKN, 2GL3, 2GLN

  • PubMed Abstract: 

    The crystallographic structure of oxygenated trHbN from Mycobacterium tuberculosis showed an extended heme distal site hydrogen-bonding network that includes Y(B10), Q(E11), and the bound O(2) (Milani, M., et al. (2001) EMBO J. 20, 3902-3909). In the present work, we analyze the effects that substitutions at the B10 and E11 positions exert on the heme and its coordinated ligands, using steady-state resonance Raman spectroscopy, absorption spectroscopy and X-ray crystallography. Our results show that (1) residues Y(B10) and Q(E11) control the binding and the ionization state of the heme-bound water molecules in ferric trHbN and are important in keeping the sixth coordination position vacant in deoxy trHbN; (2) residue Q(E11) plays a role in maintaining the integrity of the proximal Fe-His bond in deoxy trHbN; (3) in wild-type oxy-trHbN, the size and hydrogen-bonding capability of residue E11 is important to sustain proper interaction between Y(B10) and the heme-bound O(2); (4) CO-trHbN is in a conformational equilibrium, where either the Y(B10) or the Q(E11) residue interacts with the heme-bound CO; and (5) Y(B10) and Q(E11) residues control the conformation (and likely the dynamics) of the protein matrix tunnel gating residue F(E15). These findings suggest that the functional processes of ligand binding and diffusion are controlled in trHbN through the dynamic interaction of residues Y(B10), Q(E11), F(E15), and the heme ligand.


  • Organizational Affiliation

    Department of Biochemistry and Microbiology, Laval University, Quebec, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hemoglobin-like protein HbN
A, B
136Mycobacterium tuberculosisMutation(s): 1 
Gene Names: glbN
UniProt
Find proteins for P9WN25 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WN25 
Go to UniProtKB:  P9WN25
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WN25
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
PO4
Query on PO4

Download Ideal Coordinates CCD File 
D [auth A],
G [auth B]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
CYN
Query on CYN

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B]
CYANIDE ION
C N
XFXPMWWXUTWYJX-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
C [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.98 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.777α = 90
b = 60.443β = 90
c = 87.886γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
EPMRphasing
REFMACrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-19
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-02-14
    Changes: Data collection