5MH4

Crystal Structure of Lactococcus lactis Thioredoxin Reductase (FR conformation)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.14 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The structure of Lactococcus lactis thioredoxin reductase reveals molecular features of photo-oxidative damage.

Skjoldager, N.Blanner Bang, M.Rykr, M.Bjornberg, O.Davies, M.J.Svensson, B.Harris, P.Hagglund, P.

(2017) Sci Rep 7: 46282-46282

  • DOI: 10.1038/srep46282
  • Primary Citation of Related Structures:  
    5MH4, 5MIP, 5MJK, 5MIR, 5MIQ, 5MIT, 5MIS

  • PubMed Abstract: 
  • The NADPH-dependent homodimeric flavoenzyme thioredoxin reductase (TrxR) provides reducing equivalents to thioredoxin, a key regulator of various cellular redox processes. Crystal structures of photo-inactivated thioredoxin reductase (TrxR) from the Gram ...

    The NADPH-dependent homodimeric flavoenzyme thioredoxin reductase (TrxR) provides reducing equivalents to thioredoxin, a key regulator of various cellular redox processes. Crystal structures of photo-inactivated thioredoxin reductase (TrxR) from the Gram-positive bacterium Lactococcus lactis have been determined. These structures reveal novel molecular features that provide further insight into the mechanisms behind the sensitivity of this enzyme toward visible light. We propose that a pocket on the si-face of the isoalloxazine ring accommodates oxygen that reacts with photo-excited FAD generating superoxide and a flavin radical that oxidize the isoalloxazine ring C7α methyl group and a nearby tyrosine residue. This tyrosine and key residues surrounding the oxygen pocket are conserved in enzymes from related bacteria, including pathogens such as Staphylococcus aureus. Photo-sensitivity may thus be a widespread feature among bacterial TrxR with the described characteristics, which affords applications in clinical photo-therapy of drug-resistant bacteria.


    Organizational Affiliation

    Department of Biotechnology and Biomedicine, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thioredoxin reductase A327Lactococcus lactis subsp. cremorisMutation(s): 0 
Gene Names: N41_1746NCDO763_0431
EC: 1.8.1.9
Find proteins for A2RLJ5 (Lactococcus lactis subsp. cremoris (strain MG1363))
Explore A2RLJ5 
Go to UniProtKB:  A2RLJ5
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
A
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
NAP
Query on NAP

Download Ideal Coordinates CCD File 
A
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
PEG
Query on PEG

Download Ideal Coordinates CCD File 
A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.14 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.54α = 90
b = 120.54β = 90
c = 60.47γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Technical University of DenmarkDenmark--

Revision History 

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2017-04-19
    Changes: Database references