4LL4

The structure of the TRX and TXNIP complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The structural basis for the negative regulation of thioredoxin by thioredoxin-interacting protein

Hwang, J.Suh, H.W.Jeon, Y.H.Hwang, E.Nguyen, L.T.Yeom, J.Lee, S.G.Lee, C.Kim, K.J.Kang, B.S.Jeong, J.O.Oh, T.K.Choi, I.Lee, J.O.Kim, M.H.

(2014) Nat Commun 5: 2958-2958

  • DOI: 10.1038/ncomms3958
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The redox-dependent inhibition of thioredoxin (TRX) by thioredoxin-interacting protein (TXNIP) plays a pivotal role in various cancers and metabolic syndromes. However, the molecular mechanism of this regulation is largely unknown. Here, we present t ...

    The redox-dependent inhibition of thioredoxin (TRX) by thioredoxin-interacting protein (TXNIP) plays a pivotal role in various cancers and metabolic syndromes. However, the molecular mechanism of this regulation is largely unknown. Here, we present the crystal structure of the TRX-TXNIP complex and demonstrate that the inhibition of TRX by TXNIP is mediated by an intermolecular disulphide interaction resulting from a novel disulphide bond-switching mechanism. Upon binding to TRX, TXNIP undergoes a structural rearrangement that involves switching of a head-to-tail interprotomer Cys63-Cys247 disulphide between TXNIP molecules to an interdomain Cys63-Cys190 disulphide, and the formation of a de novo intermolecular TXNIP Cys247-TRX Cys32 disulphide. This disulphide-switching event unexpectedly results in a domain arrangement of TXNIP that is entirely different from those of other arrestin family proteins. We further show that the intermolecular disulphide bond between TRX and TXNIP dissociates in the presence of high concentrations of reactive oxygen species. This study provides insight into TRX and TXNIP-dependent cellular regulation.


    Organizational Affiliation

    1] Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea [2] Infection and Immunity Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin-interacting protein
A, C
315Homo sapiensMutation(s): 3 
Gene Names: TXNIP (VDUP1)
Find proteins for Q9H3M7 (Homo sapiens)
Go to Gene View: TXNIP
Go to UniProtKB:  Q9H3M7
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin
B, D
105Homo sapiensMutation(s): 1 
Gene Names: TXN (TRDX, TRX, TRX1)
Find proteins for P10599 (Homo sapiens)
Go to Gene View: TXN
Go to UniProtKB:  P10599
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.196 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 79.826α = 90.00
b = 64.990β = 90.88
c = 88.416γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data collection
MOLREPphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-07-09 
  • Released Date: 2014-02-05 
  • Deposition Author(s): Hwang, J., Kim, M.H.

Revision History 

  • Version 1.0: 2014-02-05
    Type: Initial release