3EUL

Structure of the signal receiver domain of the putative response regulator NarL from Mycobacterium tuberculosis

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

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This is version 1.2 of the entry. See complete history. 


Literature

1.9 A structure of the signal receiver domain of the putative response regulator NarL from Mycobacterium tuberculosis.

Schnell, R., Agren, D., Schneider, G.

(2008) Acta Crystallogr Sect F Struct Biol Cryst Commun 64: 1096-1100

  • DOI: 10.1107/S1744309108035203
  • Primary Citation of Related Structures:  
    3EUL

  • PubMed Abstract: 

    • NarL from Mycobacterium tuberculosis is a putative nitrate response regulator that is involved in the regulation of anaerobic metabolism in this pathogen. The recombinant purified N-terminal signal receiver domain of NarL has been crystallized in space g ...

    NarL from Mycobacterium tuberculosis is a putative nitrate response regulator that is involved in the regulation of anaerobic metabolism in this pathogen. The recombinant purified N-terminal signal receiver domain of NarL has been crystallized in space group C222(1), with unit-cell parameters a = 85.6, b = 90.0, c = 126.3 A, and the structure was determined by molecular replacement to 1.9 A resolution. Comparisons with related signal receiver domains show that the closest structural homologue is an uncharacterized protein from Staphylococcus aureus, whereas the nearest sequence homologue, NarL from Escherichia coli, displays larger differences in three-dimensional structure. The largest differences between the mycobacterial and E. coli NarL domains were found in the loop between beta3 and alpha3 in the proximity of the phosphorylation site. The active site in response regulators is similar to that of members of the haloacid dehalogenase (HAD) family, which also form a phospho-aspartyl intermediate. In NarL, the aspartic acid that acts as catalytic acid/base in several HAD enzymes is replaced by an arginine residue, which is less likely to participate in steps involving proton abstraction. This substitution may slow down the breakdown of the phospho-aspartyl anhydride and allow signalling beyond the timescales defined by a catalytic reaction intermediate.

    Organizational Affiliation: 

    Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 77 Stockholm, Sweden. robert.schnell@ki.se



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
POSSIBLE NITRATE/NITRITE RESPONSE TRANSCRIPTIONAL REGULATORY PROTEIN NARL (DNA-binding response regulator, LuxR family) A, B, C, D152Mycobacterium tuberculosisMutation(s): 0 
Gene Names: MT0866, narL, Rv0844c
Find proteins for P9WGM5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WGM5 
Go to UniProtKB:  P9WGM5
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL
Download Ideal Coordinates CCD File 
B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.532α = 90
b = 90.038β = 90
c = 126.336γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-11-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2018-01-24
    Changes: Structure summary