2A87

Crystal Structure of M. tuberculosis Thioredoxin reductase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.215 

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


Literature

Conformational flexibility of Mycobacterium tuberculosis thioredoxin reductase: crystal structure and normal-mode analysis.

Akif, M., Suhre, K., Verma, C., Mande, S.C.

(2005) Acta Crystallogr D Biol Crystallogr 61: 1603-1611

  • DOI: 10.1107/S0907444905030519
  • Primary Citation of Related Structures:  
    2A87

  • PubMed Abstract: 

    • The thioredoxin system exists ubiquitously and participates in essential antioxidant and redox-regulation processes via a pair of conserved cysteine residues. In Mycobacterium tuberculosis, which lacks a genuine glutathione system, the thioredoxin system provides reducing equivalents inside the cell ...

    The thioredoxin system exists ubiquitously and participates in essential antioxidant and redox-regulation processes via a pair of conserved cysteine residues. In Mycobacterium tuberculosis, which lacks a genuine glutathione system, the thioredoxin system provides reducing equivalents inside the cell. The three-dimensional structure of thioredoxin reductase from M. tuberculosis has been determined at 3 A resolution. TLS refinement reveals a large libration axis, showing that NADPH-binding domain has large anisotropic disorder. The relative rotation of the NADPH domain with respect to the FAD domain is necessary for the thioredoxin reduction cycle, as it brings the spatially distant reacting sites close together. Normal-mode analysis carried out based on the elastic network model shows that the motion required to bring about the functional conformational change can be accounted for by motion along one single mode. TLS refinement and normal-mode analysis thus enhance our understanding of the associated conformational changes.

    Organizational Affiliation: 

    Centre for DNA Fingerprinting and Diagnostics, Nacharam, Hyderabad, India.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thioredoxin reductaseA, B335Mycobacterium tuberculosisMutation(s): 0 
Gene Names: trxB
EC: 1.8.1.9
UniProt
Find proteins for P9WHH1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WHH1 
Go to UniProtKB:  P9WHH1
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD
Download Ideal Coordinates CCD File 
 D [auth A], G [auth B]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N		 Ligand Interaction
NAP
Query on NAP
Download Ideal Coordinates CCD File 
 E [auth A], H [auth B]NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
 C [auth A], F [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.215 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.4α = 90
b = 107.4β = 90
c = 118.2γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-29
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance